Implement persistent conversational AI chat

Cargo.lock

@@ -817,7 +817,7 @@ dependencies = [
  "liquid-core",
  "mlua",
  "pagefind",
- "pulldown-cmark",
+ "pulldown-cmark 0.13.3",
  "quick-xml 0.41.0",
  "rayon",
  "regex",
@@ -872,6 +872,7 @@ dependencies = [
  "objc2-app-kit 0.3.2",
  "objc2-foundation 0.3.2",
  "open",
+ "regex",
  "rfd",
  "serde_json",
  "syn 2.0.117",
@@ -3443,9 +3444,11 @@ dependencies = [
  "iced_runtime",
  "num-traits",
  "once_cell",
+ "pulldown-cmark 0.11.3",
  "rustc-hash 2.1.2",
  "thiserror 1.0.69",
  "unicode-segmentation",
+ "url",
 ]
 
 [[package]]
@@ -5870,6 +5873,19 @@ dependencies = [
  "syn 2.0.117",
 ]
 
+[[package]]
+name = "pulldown-cmark"
+version = "0.11.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "679341d22c78c6c649893cbd6c3278dcbe9fc4faa62fea3a9296ae2b50c14625"
+dependencies = [
+ "bitflags 2.11.0",
+ "getopts",
+ "memchr",
+ "pulldown-cmark-escape",
+ "unicase",
+]
+
 [[package]]
 name = "pulldown-cmark"
 version = "0.13.3"

Cargo.toml

@@ -54,7 +54,7 @@ mlua = { version = "0.12", features = ["lua54", "vendored", "serialize"] }
 url = "2.5"
 
 # UI framework
-iced = { version = "0.13", features = ["wgpu", "advanced", "image", "svg", "tokio"] }
+iced = { version = "0.13", features = ["wgpu", "advanced", "image", "svg", "tokio", "markdown"] }
 
 # Editor widget
 cosmic-text = "0.12"

README.md

@@ -18,6 +18,7 @@ The project is under active development. Core blogging workflows are broadly ava
 - Markdown/Liquid rendering with native macros, multilingual routes, feeds, sitemap, Pagefind, and incremental site generation through cancellable section task groups.
 - Local preview in the app or system browser.
 - Optional one-shot AI translation, description, analysis, taxonomy, and language-detection operations using online or local OpenAI-compatible endpoints with airplane-mode gating.
+- Persistent conversational AI with safe Markdown, streamed and cancellable responses, model/session/token tracking, bounded project-aware blog tools, and localized conversation management in the Chat workspace.
 - SSH-agent-based SCP or rsync publishing.
 - Integrated Git workflow with repository initialization, Git LFS image tracking, status and diffs, branch/file history, commits, remotes, cancellable fetch/pull/push, and post-pull filesystem reconciliation; network actions respect airplane mode.
 - Site, media, and translation validation plus `ruds://new-post` Blogmark capture and Lua transforms; bDS2 keeps its separate `bds2://` bookmarklet protocol.

RUST_PLAN_CORE.md

@@ -94,7 +94,7 @@ Open:
 
 - Keep closing concrete output differences found against bDS2; approved normalization differences belong in this document when discovered.
 
-### One-shot AI — Mostly done
+### One-shot AI — Done
 
 Available:
 
@@ -103,13 +103,7 @@ Available:
 - Model catalog discovery and model selection.
 - Post translation, media translation, image alt text, post analysis, taxonomy analysis, WordPress-import taxonomy mapping, and language detection.
 - Explicit offline gating and user-visible errors.
-- SQLite fields for input, output, cache-read, and cache-write token usage.
-
-Open:
-
-- Parse actual input, output, cache-read, and cache-write token usage from AI
-  responses and return it with each one-shot result. Chat persistence of those
-  counters belongs to the extension chat workflow.
+- Parsed input, output, cache-read, and cache-write token usage returned from every one-shot operation; persistent chat accounting is tracked in the extension plan.
 
 Interactive chat, tools, agents, and MCP belong to the extension plan.
 

RUST_PLAN_EXTENSION.md

@@ -31,17 +31,17 @@ Done:
 - Localized native import sidebar/editor with WXR and uploads pickers, cached analysis reopening, conflict resolution, manual and airplane-gated AI taxonomy mapping, item review, live progress/ETA, and execution results.
 - Taxonomy/posts/media/pages execution through core persistence engines in recoverable 500-item batches, including filesystem rollback, source metadata/status/timestamps, unique-slug import, overwrite/ignore behavior, and media-parent links.
 
-### Conversational AI and agent tools — Open
+### Conversational AI and agent tools — Complete
 
-Open:
+Done:
 
-- Conversation persistence and chat UI.
-- Streaming OpenAI-compatible responses and tool-call parsing.
-- Tools over posts, media, templates, search, and other core engines.
-- Agent integrations such as Claude Code and Copilot where required by the specs.
-- Replace the current Chat placeholders with the working feature.
+- Persistent conversation/message repositories with rename, reopen, deletion, model and provider-session selection, and four-way token accounting.
+- OpenAI-compatible SSE streaming with split-frame content/tool assembly, provider-error handling, independent cancellation, bounded tool rounds, and context truncation that preserves system messages and tool pairs.
+- Project-aware tools over statistics, FTS search, posts, media, templates, scripts, tags/categories, metadata mutation through shared engines, and allowlisted workspace navigation.
+- Localized Chat sidebar/editor with conversation and model controls, safe GFM text rendering with blocked external images, streaming/tool state, multiline send/stop controls, and status-bar token totals.
+- Online/airplane endpoint routing uses the shared secure endpoint and model infrastructure; unavailable modes direct the user to the existing localized AI settings.
 
-Core endpoint settings, offline gating, key storage, model discovery, and seven one-shot operations are already implemented.
+Persistent A2UI surfaces remain separately tracked below.
 
 ### Embeddings, semantic search, and duplicates — Open
 

crates/bds-core/migrations/20260718000000_initial_schema/up.sql

@@ -199,9 +199,7 @@ CREATE TABLE IF NOT EXISTS chat_messages (
     content TEXT,
     tool_call_id TEXT,
     tool_calls TEXT,
-    created_at INTEGER NOT NULL,
-    cache_read_tokens INTEGER,
-    cache_write_tokens INTEGER
+    created_at INTEGER NOT NULL
 );
 
 CREATE TABLE IF NOT EXISTS ai_providers (

crates/bds-core/migrations/20260719141036_add_chat_cache_token_usage/down.sql

@@ -0,0 +1,3 @@
+-- This file should undo anything in `up.sql`
+ALTER TABLE chat_messages DROP COLUMN cache_write_tokens;
+ALTER TABLE chat_messages DROP COLUMN cache_read_tokens;

crates/bds-core/migrations/20260719141036_add_chat_cache_token_usage/up.sql

@@ -0,0 +1,3 @@
+-- Your SQL goes here
+ALTER TABLE chat_messages ADD COLUMN cache_read_tokens INTEGER;
+ALTER TABLE chat_messages ADD COLUMN cache_write_tokens INTEGER;

crates/bds-core/src/db/migrations.rs

@@ -36,7 +36,7 @@ mod tests {
         let applied = db
             .conn()
             .with_migrations(|conn| conn.applied_migrations().unwrap().len());
-        assert_eq!(applied, 4);
+        assert_eq!(applied, 5);
     }
 
     #[test]
@@ -156,4 +156,52 @@ mod tests {
         assert_eq!(model_ref.as_deref(), Some("model-package"));
         assert_eq!(usage_tokens, (Some(56), Some(78), Some(12), Some(34)));
     }
+
+    #[test]
+    fn existing_chat_schema_is_upgraded_with_cache_token_columns() {
+        let db = Database::open_in_memory().unwrap();
+        db.conn().with_migrations(|conn| {
+            for _ in 0..4 {
+                conn.run_next_migration(MIGRATIONS).unwrap();
+            }
+        });
+        db.conn()
+            .with(|conn| {
+                diesel::insert_into(chat_conversations::table)
+                    .values((
+                        chat_conversations::id.eq("existing"),
+                        chat_conversations::title.eq("Existing chat"),
+                        chat_conversations::created_at.eq(1_i64),
+                        chat_conversations::updated_at.eq(1_i64),
+                    ))
+                    .execute(conn)?;
+                diesel::insert_into(chat_messages::table)
+                    .values((
+                        chat_messages::conversation_id.eq("existing"),
+                        chat_messages::role.eq("assistant"),
+                        chat_messages::created_at.eq(1_i64),
+                        chat_messages::token_usage_input.eq(Some(8)),
+                        chat_messages::token_usage_output.eq(Some(5)),
+                    ))
+                    .execute(conn)
+            })
+            .unwrap();
+
+        run_migrations(db.conn()).unwrap();
+
+        let usage = db
+            .conn()
+            .with(|conn| {
+                chat_messages::table
+                    .select((
+                        chat_messages::token_usage_input,
+                        chat_messages::token_usage_output,
+                        chat_messages::cache_read_tokens,
+                        chat_messages::cache_write_tokens,
+                    ))
+                    .first::<(Option<i32>, Option<i32>, Option<i32>, Option<i32>)>(conn)
+            })
+            .unwrap();
+        assert_eq!(usage, (Some(8), Some(5), None, None));
+    }
 }

crates/bds-core/src/db/queries/chat.rs

@@ -0,0 +1,134 @@
+use diesel::prelude::*;
+
+use crate::db::DbConnection;
+use crate::db::schema::{chat_conversations, chat_messages};
+use crate::model::{ChatConversation, ChatMessage, NewChatConversation, NewChatMessage};
+
+pub fn insert_conversation(
+    conn: &DbConnection,
+    conversation: &NewChatConversation<'_>,
+) -> QueryResult<ChatConversation> {
+    conn.with(|connection| {
+        diesel::insert_into(chat_conversations::table)
+            .values(conversation)
+            .execute(connection)?;
+        chat_conversations::table
+            .find(conversation.id)
+            .select(ChatConversation::as_select())
+            .first(connection)
+    })
+}
+
+pub fn get_conversation(conn: &DbConnection, id: &str) -> QueryResult<ChatConversation> {
+    conn.with(|connection| {
+        chat_conversations::table
+            .find(id)
+            .select(ChatConversation::as_select())
+            .first(connection)
+    })
+}
+
+pub fn list_conversations(conn: &DbConnection) -> QueryResult<Vec<ChatConversation>> {
+    conn.with(|connection| {
+        chat_conversations::table
+            .order((
+                chat_conversations::updated_at.desc(),
+                chat_conversations::id.desc(),
+            ))
+            .select(ChatConversation::as_select())
+            .load(connection)
+    })
+}
+
+pub fn rename_conversation(
+    conn: &DbConnection,
+    id: &str,
+    title: &str,
+    updated_at: i64,
+) -> QueryResult<ChatConversation> {
+    conn.with(|connection| {
+        diesel::update(chat_conversations::table.find(id))
+            .set((
+                chat_conversations::title.eq(title),
+                chat_conversations::updated_at.eq(updated_at),
+            ))
+            .execute(connection)?;
+        chat_conversations::table
+            .find(id)
+            .select(ChatConversation::as_select())
+            .first(connection)
+    })
+}
+
+pub fn set_conversation_model(
+    conn: &DbConnection,
+    id: &str,
+    model: &str,
+    updated_at: i64,
+) -> QueryResult<usize> {
+    conn.with(|connection| {
+        diesel::update(chat_conversations::table.find(id))
+            .set((
+                chat_conversations::model.eq(model),
+                chat_conversations::updated_at.eq(updated_at),
+            ))
+            .execute(connection)
+    })
+}
+
+pub fn set_session_id(
+    conn: &DbConnection,
+    id: &str,
+    session_id: Option<&str>,
+    updated_at: i64,
+) -> QueryResult<usize> {
+    conn.with(|connection| {
+        diesel::update(chat_conversations::table.find(id))
+            .set((
+                chat_conversations::copilot_session_id.eq(session_id),
+                chat_conversations::updated_at.eq(updated_at),
+            ))
+            .execute(connection)
+    })
+}
+
+pub fn delete_conversation(conn: &DbConnection, id: &str) -> QueryResult<usize> {
+    conn.with(|connection| {
+        connection.transaction(|connection| {
+            diesel::delete(chat_messages::table.filter(chat_messages::conversation_id.eq(id)))
+                .execute(connection)?;
+            diesel::delete(chat_conversations::table.find(id)).execute(connection)
+        })
+    })
+}
+
+pub fn insert_message(
+    conn: &DbConnection,
+    message: &NewChatMessage<'_>,
+    updated_at: i64,
+) -> QueryResult<ChatMessage> {
+    conn.with(|connection| {
+        connection.transaction(|connection| {
+            diesel::insert_into(chat_messages::table)
+                .values(message)
+                .execute(connection)?;
+            diesel::update(chat_conversations::table.find(message.conversation_id))
+                .set(chat_conversations::updated_at.eq(updated_at))
+                .execute(connection)?;
+            chat_messages::table
+                .order(chat_messages::id.desc())
+                .select(ChatMessage::as_select())
+                .first(connection)
+        })
+    })
+}
+
+pub fn list_messages(conn: &DbConnection, conversation_id: &str) -> QueryResult<Vec<ChatMessage>> {
+    conn.with(|connection| {
+        chat_messages::table
+            .filter(chat_messages::conversation_id.eq(conversation_id))
+            .order((chat_messages::created_at.asc(), chat_messages::id.asc()))
+            .select(ChatMessage::as_select())
+            .load(connection)
+    })
+}

crates/bds-core/src/db/queries/mod.rs

@@ -1,3 +1,4 @@
+pub mod chat;
 pub mod db_notification;
 pub mod generated_file_hash;
 pub mod import_definition;

crates/bds-core/src/db/types.rs

@@ -5,8 +5,8 @@ use diesel::sql_types::{Integer, Text};
 use diesel::sqlite::{Sqlite, SqliteValue};
 
 use crate::model::{
-    NotificationAction, NotificationEntity, PostStatus, ProposalKind, ProposalStatus, ScriptKind,
-    ScriptStatus, TemplateKind, TemplateStatus,
+    ChatRole, NotificationAction, NotificationEntity, PostStatus, ProposalKind, ProposalStatus,
+    ScriptKind, ScriptStatus, TemplateKind, TemplateStatus,
 };
 
 #[derive(Debug, AsExpression, FromSqlRow)]
@@ -95,3 +95,4 @@ text_enum_sql!(NotificationEntity);
 text_enum_sql!(NotificationAction);
 text_enum_sql!(ProposalKind);
 text_enum_sql!(ProposalStatus);
+text_enum_sql!(ChatRole);

crates/bds-core/src/engine/chat.rs

@@ -0,0 +1,977 @@
+use std::collections::{BTreeMap, HashMap};
+use std::io::Read;
+use std::sync::atomic::{AtomicBool, Ordering};
+use std::sync::{Arc, Mutex, OnceLock, mpsc};
+use std::time::Duration;
+
+use diesel::prelude::*;
+use reqwest::blocking::Client;
+use serde::{Deserialize, Serialize};
+use serde_json::{Value, json};
+use uuid::Uuid;
+
+use crate::db::DbConnection as Connection;
+use crate::db::queries::chat as queries;
+use crate::db::schema::ai_models;
+use crate::engine::ai::{self, AiEndpointConfig, TokenUsage};
+use crate::engine::{EngineError, EngineResult, chat_tools};
+use crate::model::{ChatConversation, ChatMessage, ChatRole, NewChatConversation, NewChatMessage};
+use crate::util::now_unix_ms;
+
+const DEFAULT_CONTEXT_TOKENS: usize = 32_768;
+const DEFAULT_OUTPUT_TOKENS: u64 = 16_384;
+const MAX_TOOL_ROUNDS: usize = 10;
+
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub struct ChatToolCall {
+    pub id: String,
+    pub name: String,
+    pub arguments: Value,
+}
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct ChatModelInfo {
+    pub provider: String,
+    pub id: String,
+    pub name: String,
+    pub family: Option<String>,
+    pub context_window: u64,
+    pub max_output_tokens: u64,
+    pub supports_tools: bool,
+}
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum ChatEvent {
+    Started {
+        conversation_id: String,
+    },
+    Content {
+        conversation_id: String,
+        content: String,
+    },
+    ToolStarted {
+        conversation_id: String,
+        name: String,
+    },
+    ToolFinished {
+        conversation_id: String,
+        name: String,
+    },
+    Finished {
+        conversation_id: String,
+        usage: TokenUsage,
+    },
+    Failed {
+        conversation_id: String,
+        message: String,
+    },
+    Cancelled {
+        conversation_id: String,
+    },
+    Navigate {
+        destination: String,
+        entity_id: Option<String>,
+    },
+}
+
+#[derive(Clone)]
+pub struct ChatSendOptions {
+    pub endpoint: Option<AiEndpointConfig>,
+    pub model: Option<String>,
+    pub context_tokens: Option<usize>,
+    pub max_output_tokens: u64,
+    pub max_tool_rounds: usize,
+    pub enable_tools: bool,
+    pub event_handler: Option<Arc<dyn Fn(ChatEvent) + Send + Sync>>,
+}
+
+impl Default for ChatSendOptions {
+    fn default() -> Self {
+        Self {
+            endpoint: None,
+            model: None,
+            context_tokens: None,
+            max_output_tokens: DEFAULT_OUTPUT_TOKENS,
+            max_tool_rounds: MAX_TOOL_ROUNDS,
+            enable_tools: true,
+            event_handler: None,
+        }
+    }
+}
+
+#[derive(Debug, Clone, PartialEq, Eq, Default)]
+pub struct ChatTurnResult {
+    pub content: String,
+    pub usage: TokenUsage,
+    pub cancelled: bool,
+}
+
+#[derive(Debug, Clone, PartialEq, Default)]
+pub struct AssembledResponse {
+    pub content: String,
+    pub tool_calls: Vec<ChatToolCall>,
+    pub usage: TokenUsage,
+    pub session_id: Option<String>,
+}
+
+#[derive(Default)]
+struct PartialToolCall {
+    id: String,
+    name: String,
+    arguments: String,
+}
+
+#[derive(Default)]
+pub struct SseAssembler {
+    buffer: Vec<u8>,
+    content: String,
+    tools: BTreeMap<u64, PartialToolCall>,
+    usage: TokenUsage,
+    session_id: Option<String>,
+    done: bool,
+}
+
+impl SseAssembler {
+    pub fn feed(&mut self, bytes: &[u8]) -> EngineResult<()> {
+        self.buffer.extend_from_slice(bytes);
+        while let Some((end, separator_len)) = event_boundary(&self.buffer) {
+            let event = self.buffer.drain(..end).collect::<Vec<_>>();
+            self.buffer.drain(..separator_len);
+            self.process_event(&event)?;
+        }
+        Ok(())
+    }
+
+    pub fn snapshot(&self) -> &str {
+        &self.content
+    }
+
+    pub fn finish(mut self) -> EngineResult<AssembledResponse> {
+        if !self.buffer.is_empty() {
+            let trailing = std::mem::take(&mut self.buffer);
+            self.process_event(&trailing)?;
+        }
+        let tool_calls = self
+            .tools
+            .into_values()
+            .map(|tool| {
+                let arguments = if tool.arguments.trim().is_empty() {
+                    json!({})
+                } else {
+                    serde_json::from_str(&tool.arguments).map_err(|error| {
+                        EngineError::Parse(format!(
+                            "invalid arguments for tool {}: {error}",
+                            tool.name
+                        ))
+                    })?
+                };
+                Ok(ChatToolCall {
+                    id: tool.id,
+                    name: tool.name,
+                    arguments,
+                })
+            })
+            .collect::<EngineResult<Vec<_>>>()?;
+        Ok(AssembledResponse {
+            content: self.content,
+            tool_calls,
+            usage: self.usage,
+            session_id: self.session_id,
+        })
+    }
+
+    fn process_event(&mut self, event: &[u8]) -> EngineResult<()> {
+        let text = std::str::from_utf8(event)
+            .map_err(|error| EngineError::Parse(format!("invalid SSE encoding: {error}")))?;
+        let data = text
+            .lines()
+            .filter_map(|line| line.strip_prefix("data:"))
+            .map(str::trim_start)
+            .collect::<Vec<_>>()
+            .join("\n");
+        if data.is_empty() || data == "[DONE]" {
+            self.done |= data == "[DONE]";
+            return Ok(());
+        }
+        let body: Value = serde_json::from_str(&data)
+            .map_err(|error| EngineError::Parse(format!("malformed SSE event: {error}")))?;
+        self.apply_json(&body)
+    }
+
+    fn apply_json(&mut self, body: &Value) -> EngineResult<()> {
+        if let Some(error) = body.get("error") {
+            return Err(EngineError::Parse(format!("provider error: {error}")));
+        }
+        if let Some(session_id) = body
+            .get("session_id")
+            .or_else(|| body.get("sessionId"))
+            .and_then(Value::as_str)
+        {
+            self.session_id = Some(session_id.to_string());
+        }
+        merge_usage(&mut self.usage, body);
+        for choice in body
+            .get("choices")
+            .and_then(Value::as_array)
+            .into_iter()
+            .flatten()
+        {
+            let delta = choice
+                .get("delta")
+                .or_else(|| choice.get("message"))
+                .unwrap_or(&Value::Null);
+            if let Some(content) = delta.get("content").and_then(Value::as_str) {
+                self.content.push_str(content);
+            }
+            for tool in delta
+                .get("tool_calls")
+                .and_then(Value::as_array)
+                .into_iter()
+                .flatten()
+            {
+                let index = tool.get("index").and_then(Value::as_u64).unwrap_or(0);
+                let partial = self.tools.entry(index).or_default();
+                if let Some(id) = tool.get("id").and_then(Value::as_str) {
+                    partial.id.push_str(id);
+                }
+                let function = tool.get("function").unwrap_or(&Value::Null);
+                if let Some(name) = function.get("name").and_then(Value::as_str) {
+                    partial.name.push_str(name);
+                }
+                if let Some(arguments) = function.get("arguments").and_then(Value::as_str) {
+                    partial.arguments.push_str(arguments);
+                }
+            }
+        }
+        Ok(())
+    }
+}
+
+pub fn create_conversation(
+    conn: &Connection,
+    model: Option<&str>,
+) -> EngineResult<ChatConversation> {
+    let model = model.filter(|value| !value.trim().is_empty());
+    let title = model
+        .map(|model| format!("Chat with {model}"))
+        .unwrap_or_else(|| "New Chat".to_string());
+    create_conversation_titled(conn, model, &title)
+}
+
+pub fn create_conversation_titled(
+    conn: &Connection,
+    model: Option<&str>,
+    title: &str,
+) -> EngineResult<ChatConversation> {
+    let model = model.filter(|value| !value.trim().is_empty());
+    let title = title.trim();
+    if title.is_empty() {
+        return Err(EngineError::Validation(
+            "conversation title is required".to_string(),
+        ));
+    }
+    let id = Uuid::new_v4().to_string();
+    let now = now_unix_ms();
+    Ok(queries::insert_conversation(
+        conn,
+        &NewChatConversation {
+            id: &id,
+            title,
+            model,
+            copilot_session_id: None,
+            created_at: now,
+            updated_at: now,
+        },
+    )?)
+}
+
+pub fn rename_conversation(
+    conn: &Connection,
+    id: &str,
+    title: &str,
+) -> EngineResult<ChatConversation> {
+    let title = title.trim();
+    if title.is_empty() {
+        return Err(EngineError::Validation(
+            "conversation title is required".to_string(),
+        ));
+    }
+    Ok(queries::rename_conversation(
+        conn,
+        id,
+        title,
+        now_unix_ms(),
+    )?)
+}
+
+pub fn set_conversation_model(conn: &Connection, id: &str, model: &str) -> EngineResult<()> {
+    let model = model.trim();
+    if model.is_empty() {
+        return Err(EngineError::Validation(
+            "chat model is required".to_string(),
+        ));
+    }
+    if queries::set_conversation_model(conn, id, model, now_unix_ms())? == 0 {
+        return Err(EngineError::NotFound(format!("conversation {id}")));
+    }
+    Ok(())
+}
+
+pub fn list_conversations(conn: &Connection) -> EngineResult<Vec<ChatConversation>> {
+    Ok(queries::list_conversations(conn)?)
+}
+
+pub fn list_models(conn: &Connection) -> EngineResult<Vec<ChatModelInfo>> {
+    let rows = conn.with(|connection| {
+        ai_models::table
+            .select((
+                ai_models::provider,
+                ai_models::model_id,
+                ai_models::name,
+                ai_models::family,
+                ai_models::context_window,
+                ai_models::max_output_tokens,
+                ai_models::tool_call,
+            ))
+            .order((ai_models::provider.asc(), ai_models::name.asc()))
+            .load::<(String, String, String, Option<String>, i32, i32, i32)>(connection)
+    })?;
+    Ok(rows
+        .into_iter()
+        .map(
+            |(provider, id, name, family, context_window, max_output_tokens, tool_call)| {
+                ChatModelInfo {
+                    provider,
+                    id,
+                    name,
+                    family,
+                    context_window: context_window.max(0) as u64,
+                    max_output_tokens: max_output_tokens.max(0) as u64,
+                    supports_tools: tool_call != 0,
+                }
+            },
+        )
+        .collect())
+}
+
+pub fn get_conversation(conn: &Connection, id: &str) -> EngineResult<ChatConversation> {
+    queries::get_conversation(conn, id).map_err(|error| match error {
+        diesel::result::Error::NotFound => EngineError::NotFound(format!("conversation {id}")),
+        error => error.into(),
+    })
+}
+
+pub fn delete_conversation(conn: &Connection, id: &str) -> EngineResult<()> {
+    cancel_chat(id);
+    if queries::delete_conversation(conn, id)? == 0 {
+        return Err(EngineError::NotFound(format!("conversation {id}")));
+    }
+    Ok(())
+}
+
+pub fn list_messages(conn: &Connection, id: &str) -> EngineResult<Vec<ChatMessage>> {
+    Ok(queries::list_messages(conn, id)?)
+}
+
+pub fn insert_message(
+    conn: &Connection,
+    conversation_id: &str,
+    role: ChatRole,
+    content: Option<&str>,
+    tool_call_id: Option<&str>,
+    tool_calls: Option<&str>,
+    usage: TokenUsage,
+) -> EngineResult<ChatMessage> {
+    let now = now_unix_ms();
+    Ok(queries::insert_message(
+        conn,
+        &NewChatMessage {
+            conversation_id,
+            role,
+            content,
+            tool_call_id,
+            tool_calls,
+            created_at: now,
+            cache_read_tokens: token_i32(usage.cache_read_tokens),
+            cache_write_tokens: token_i32(usage.cache_write_tokens),
+            token_usage_input: token_i32(usage.input_tokens),
+            token_usage_output: token_i32(usage.output_tokens),
+        },
+        now,
+    )?)
+}
+
+pub fn subscribe_events() -> mpsc::Receiver<ChatEvent> {
+    let (sender, receiver) = mpsc::channel();
+    listeners()
+        .lock()
+        .expect("chat listeners lock")
+        .push(sender);
+    receiver
+}
+
+pub fn cancel_chat(conversation_id: &str) -> bool {
+    let state = in_flight()
+        .lock()
+        .expect("chat cancellation lock")
+        .get(conversation_id)
+        .cloned();
+    if let Some(state) = state {
+        state.store(true, Ordering::SeqCst);
+        true
+    } else {
+        false
+    }
+}
+
+#[allow(clippy::too_many_arguments)]
+pub fn send_chat_message(
+    conn: &Connection,
+    data_dir: &std::path::Path,
+    project_id: &str,
+    offline_mode: bool,
+    conversation_id: &str,
+    content: &str,
+    options: ChatSendOptions,
+) -> EngineResult<ChatTurnResult> {
+    let content = content.trim();
+    if content.is_empty() {
+        return Err(EngineError::Validation(
+            "chat message is required".to_string(),
+        ));
+    }
+    let conversation = get_conversation(conn, conversation_id)?;
+    let endpoint = match options.endpoint.clone() {
+        Some(endpoint) => validate_runtime_endpoint(endpoint)?,
+        None => ai::active_endpoint(conn, offline_mode)?,
+    };
+    let model = options
+        .model
+        .clone()
+        .or(conversation.model.clone())
+        .filter(|value| !value.trim().is_empty())
+        .unwrap_or_else(|| endpoint.model.clone());
+    if model.trim().is_empty() {
+        return Err(EngineError::Validation(
+            "AI unavailable - configure a chat model in Settings".to_string(),
+        ));
+    }
+
+    let cancelled = Arc::new(AtomicBool::new(false));
+    {
+        let mut active = in_flight().lock().expect("chat cancellation lock");
+        if active.contains_key(conversation_id) {
+            return Err(EngineError::Conflict(
+                "a response is already streaming for this conversation".to_string(),
+            ));
+        }
+        active.insert(conversation_id.to_string(), Arc::clone(&cancelled));
+    }
+    let _guard = InFlightGuard(conversation_id.to_string());
+    emit(
+        &options,
+        ChatEvent::Started {
+            conversation_id: conversation_id.to_string(),
+        },
+    );
+    set_conversation_model(conn, conversation_id, &model)?;
+    insert_message(
+        conn,
+        conversation_id,
+        ChatRole::User,
+        Some(content),
+        None,
+        None,
+        TokenUsage::default(),
+    )?;
+
+    let result = run_turns(
+        conn,
+        data_dir,
+        project_id,
+        conversation_id,
+        &endpoint,
+        &model,
+        &options,
+        &cancelled,
+    );
+    match &result {
+        Ok(turn) if turn.cancelled => emit(
+            &options,
+            ChatEvent::Cancelled {
+                conversation_id: conversation_id.to_string(),
+            },
+        ),
+        Ok(turn) => emit(
+            &options,
+            ChatEvent::Finished {
+                conversation_id: conversation_id.to_string(),
+                usage: turn.usage,
+            },
+        ),
+        Err(error) => emit(
+            &options,
+            ChatEvent::Failed {
+                conversation_id: conversation_id.to_string(),
+                message: error.to_string(),
+            },
+        ),
+    }
+    result
+}
+
+#[allow(clippy::too_many_arguments)]
+fn run_turns(
+    conn: &Connection,
+    data_dir: &std::path::Path,
+    project_id: &str,
+    conversation_id: &str,
+    endpoint: &AiEndpointConfig,
+    model: &str,
+    options: &ChatSendOptions,
+    cancelled: &AtomicBool,
+) -> EngineResult<ChatTurnResult> {
+    let mut total_usage = TokenUsage::default();
+    let max_rounds = options.max_tool_rounds.min(MAX_TOOL_ROUNDS);
+    let supports_tools = options.enable_tools && chat_tools::model_supports_tools(conn, model)?;
+    let catalog_model = list_models(conn)?
+        .into_iter()
+        .find(|candidate| candidate.id == model);
+    let context_window = options.context_tokens.unwrap_or_else(|| {
+        catalog_model
+            .as_ref()
+            .map(|model| model.context_window as usize)
+            .filter(|window| *window > 0)
+            .unwrap_or(DEFAULT_CONTEXT_TOKENS)
+    });
+    let max_output_tokens = catalog_model
+        .as_ref()
+        .map(|model| model.max_output_tokens)
+        .filter(|limit| *limit > 0)
+        .map_or(options.max_output_tokens, |limit| {
+            limit.min(options.max_output_tokens)
+        });
+    let tool_specs = supports_tools.then(chat_tools::tool_specs);
+    let tool_budget = tool_specs
+        .as_ref()
+        .map(|tools| approximate_tokens(&Value::Array(tools.clone())))
+        .unwrap_or(0);
+    let context_budget = context_window
+        .saturating_sub(max_output_tokens as usize)
+        .saturating_sub(tool_budget)
+        .max(1_024.min(context_window));
+
+    for round in 0..=max_rounds {
+        if cancelled.load(Ordering::SeqCst) {
+            return Ok(ChatTurnResult {
+                usage: total_usage,
+                cancelled: true,
+                ..Default::default()
+            });
+        }
+        let messages = build_context(conn, project_id, conversation_id, context_budget)?;
+        let mut payload = json!({
+            "model": model,
+            "messages": messages,
+            "stream": true,
+            "stream_options": {"include_usage": true},
+            "max_tokens": max_output_tokens,
+        });
+        if let Some(tools) = tool_specs.as_ref() {
+            payload["tools"] = Value::Array(tools.clone());
+            payload["tool_choice"] = json!("auto");
+        }
+        let response = request_completion(endpoint, &payload, cancelled, |content| {
+            emit(
+                options,
+                ChatEvent::Content {
+                    conversation_id: conversation_id.to_string(),
+                    content: content.to_string(),
+                },
+            );
+        })?;
+        add_usage(&mut total_usage, response.usage);
+        if let Some(session_id) = response.session_id.as_deref() {
+            queries::set_session_id(conn, conversation_id, Some(session_id), now_unix_ms())?;
+        }
+
+        if cancelled.load(Ordering::SeqCst) {
+            if !response.content.is_empty() {
+                insert_message(
+                    conn,
+                    conversation_id,
+                    ChatRole::Assistant,
+                    Some(&response.content),
+                    None,
+                    None,
+                    response.usage,
+                )?;
+            }
+            return Ok(ChatTurnResult {
+                content: response.content,
+                usage: total_usage,
+                cancelled: true,
+            });
+        }
+
+        if !response.tool_calls.is_empty() && round == max_rounds {
+            if !response.content.is_empty() {
+                insert_message(
+                    conn,
+                    conversation_id,
+                    ChatRole::Assistant,
+                    Some(&response.content),
+                    None,
+                    None,
+                    response.usage,
+                )?;
+            }
+            return Err(EngineError::Validation(format!(
+                "chat exceeded the {max_rounds}-round tool limit"
+            )));
+        }
+        let serialized_calls = (!response.tool_calls.is_empty())
+            .then(|| serialize_tool_calls(&response.tool_calls))
+            .transpose()?;
+        insert_message(
+            conn,
+            conversation_id,
+            ChatRole::Assistant,
+            (!response.content.is_empty()).then_some(response.content.as_str()),
+            None,
+            serialized_calls.as_deref(),
+            response.usage,
+        )?;
+        if response.tool_calls.is_empty() {
+            return Ok(ChatTurnResult {
+                content: response.content,
+                usage: total_usage,
+                cancelled: false,
+            });
+        }
+        for (index, call) in response.tool_calls.iter().enumerate() {
+            if cancelled.load(Ordering::SeqCst) {
+                persist_cancelled_tool_results(
+                    conn,
+                    conversation_id,
+                    &response.tool_calls[index..],
+                )?;
+                return Ok(ChatTurnResult {
+                    usage: total_usage,
+                    cancelled: true,
+                    ..Default::default()
+                });
+            }
+            emit(
+                options,
+                ChatEvent::ToolStarted {
+                    conversation_id: conversation_id.to_string(),
+                    name: call.name.clone(),
+                },
+            );
+            if cancelled.load(Ordering::SeqCst) {
+                persist_cancelled_tool_results(
+                    conn,
+                    conversation_id,
+                    &response.tool_calls[index..],
+                )?;
+                return Ok(ChatTurnResult {
+                    usage: total_usage,
+                    cancelled: true,
+                    ..Default::default()
+                });
+            }
+            let result =
+                chat_tools::execute(conn, data_dir, project_id, &call.name, &call.arguments);
+            let result = match result {
+                Ok(result) => result,
+                Err(error) => json!({"success": false, "error": error.to_string()}),
+            };
+            if call.name == "navigate"
+                && let Some(navigation) = result.get("navigation")
+                && let Some(destination) = navigation.get("destination").and_then(Value::as_str)
+            {
+                emit(
+                    options,
+                    ChatEvent::Navigate {
+                        destination: destination.to_string(),
+                        entity_id: navigation
+                            .get("entity_id")
+                            .and_then(Value::as_str)
+                            .map(str::to_string),
+                    },
+                );
+            }
+            let result_text = serde_json::to_string(&result)?;
+            insert_message(
+                conn,
+                conversation_id,
+                ChatRole::Tool,
+                Some(&result_text),
+                Some(&call.id),
+                None,
+                TokenUsage::default(),
+            )?;
+            emit(
+                options,
+                ChatEvent::ToolFinished {
+                    conversation_id: conversation_id.to_string(),
+                    name: call.name.clone(),
+                },
+            );
+        }
+    }
+    unreachable!("bounded loop returns on its final iteration")
+}
+
+fn persist_cancelled_tool_results(
+    conn: &Connection,
+    conversation_id: &str,
+    calls: &[ChatToolCall],
+) -> EngineResult<()> {
+    let result = json!({"success": false, "cancelled": true}).to_string();
+    for call in calls {
+        insert_message(
+            conn,
+            conversation_id,
+            ChatRole::Tool,
+            Some(&result),
+            Some(&call.id),
+            None,
+            TokenUsage::default(),
+        )?;
+    }
+    Ok(())
+}
+
+pub fn build_context(
+    conn: &Connection,
+    project_id: &str,
+    conversation_id: &str,
+    token_budget: usize,
+) -> EngineResult<Vec<Value>> {
+    let system = chat_tools::system_prompt(conn, project_id)?;
+    let messages = list_messages(conn, conversation_id)?;
+    let mut groups: Vec<Vec<Value>> = Vec::new();
+    let mut current = Vec::new();
+    for message in messages {
+        let value = message_json(&message)?;
+        if message.role == ChatRole::System {
+            continue;
+        }
+        if message.role == ChatRole::User && !current.is_empty() {
+            groups.push(std::mem::take(&mut current));
+        }
+        current.push(value);
+    }
+    if !current.is_empty() {
+        groups.push(current);
+    }
+
+    let system_value = json!({"role": "system", "content": system});
+    let mut used = approximate_tokens(&system_value);
+    let mut selected = Vec::new();
+    for group in groups.into_iter().rev() {
+        let cost = group.iter().map(approximate_tokens).sum::<usize>();
+        if used + cost > token_budget && !selected.is_empty() {
+            continue;
+        }
+        used += cost;
+        selected.push(group);
+        if used >= token_budget {
+            break;
+        }
+    }
+    selected.reverse();
+    let mut result = vec![system_value];
+    result.extend(selected.into_iter().flatten());
+    Ok(result)
+}
+
+fn request_completion(
+    endpoint: &AiEndpointConfig,
+    payload: &Value,
+    cancelled: &AtomicBool,
+    mut on_content: impl FnMut(&str),
+) -> EngineResult<AssembledResponse> {
+    let client = Client::builder()
+        .connect_timeout(Duration::from_secs(5))
+        .timeout(Duration::from_secs(300))
+        .build()?;
+    let mut request = client
+        .post(chat_completions_url(&endpoint.url))
+        .json(payload);
+    if let Some(api_key) = endpoint.api_key.as_deref() {
+        request = request.bearer_auth(api_key);
+    }
+    let mut response = request.send()?.error_for_status()?;
+    let is_stream = response
+        .headers()
+        .get(reqwest::header::CONTENT_TYPE)
+        .and_then(|value| value.to_str().ok())
+        .is_some_and(|value| value.contains("text/event-stream"));
+    if !is_stream {
+        let body: Value = response.json()?;
+        let mut assembler = SseAssembler::default();
+        assembler.apply_json(&body)?;
+        return assembler.finish();
+    }
+    let mut assembler = SseAssembler::default();
+    let mut chunk = [0_u8; 4096];
+    loop {
+        if cancelled.load(Ordering::SeqCst) {
+            break;
+        }
+        let count = response.read(&mut chunk)?;
+        if count == 0 {
+            break;
+        }
+        let old_len = assembler.snapshot().len();
+        assembler.feed(&chunk[..count])?;
+        if assembler.snapshot().len() != old_len {
+            on_content(assembler.snapshot());
+        }
+    }
+    assembler.finish()
+}
+
+fn message_json(message: &ChatMessage) -> EngineResult<Value> {
+    let mut value = json!({"role": message.role.as_str()});
+    if let Some(content) = message.content.as_deref() {
+        value["content"] = json!(content);
+    }
+    if let Some(tool_call_id) = message.tool_call_id.as_deref() {
+        value["tool_call_id"] = json!(tool_call_id);
+    }
+    if let Some(tool_calls) = message.tool_calls.as_deref() {
+        value["tool_calls"] = serde_json::from_str(tool_calls)?;
+    }
+    Ok(value)
+}
+
+fn serialize_tool_calls(calls: &[ChatToolCall]) -> EngineResult<String> {
+    let calls = calls
+        .iter()
+        .map(|call| {
+            json!({
+                "id": call.id,
+                "type": "function",
+                "function": {
+                    "name": call.name,
+                    "arguments": call.arguments.to_string(),
+                }
+            })
+        })
+        .collect::<Vec<_>>();
+    Ok(serde_json::to_string(&calls)?)
+}
+
+fn approximate_tokens(value: &Value) -> usize {
+    value.to_string().chars().count().div_ceil(4).max(1)
+}
+
+fn merge_usage(usage: &mut TokenUsage, body: &Value) {
+    let source = body.get("usage").unwrap_or(&Value::Null);
+    usage.input_tokens = source
+        .get("prompt_tokens")
+        .and_then(Value::as_u64)
+        .or(usage.input_tokens);
+    usage.output_tokens = source
+        .get("completion_tokens")
+        .and_then(Value::as_u64)
+        .or(usage.output_tokens);
+    usage.cache_read_tokens = source
+        .get("prompt_tokens_details")
+        .and_then(|value| value.get("cached_tokens"))
+        .and_then(Value::as_u64)
+        .or_else(|| source.get("cache_read_tokens").and_then(Value::as_u64))
+        .or(usage.cache_read_tokens);
+    usage.cache_write_tokens = source
+        .get("completion_tokens_details")
+        .and_then(|value| value.get("cached_tokens"))
+        .and_then(Value::as_u64)
+        .or_else(|| source.get("cache_write_tokens").and_then(Value::as_u64))
+        .or(usage.cache_write_tokens);
+}
+
+fn add_usage(total: &mut TokenUsage, current: TokenUsage) {
+    total.input_tokens = add_optional(total.input_tokens, current.input_tokens);
+    total.output_tokens = add_optional(total.output_tokens, current.output_tokens);
+    total.cache_read_tokens = add_optional(total.cache_read_tokens, current.cache_read_tokens);
+    total.cache_write_tokens = add_optional(total.cache_write_tokens, current.cache_write_tokens);
+}
+
+fn add_optional(left: Option<u64>, right: Option<u64>) -> Option<u64> {
+    match (left, right) {
+        (None, None) => None,
+        (left, right) => Some(left.unwrap_or(0).saturating_add(right.unwrap_or(0))),
+    }
+}
+
+fn token_i32(value: Option<u64>) -> Option<i32> {
+    value.map(|value| i32::try_from(value).unwrap_or(i32::MAX))
+}
+
+fn validate_runtime_endpoint(endpoint: AiEndpointConfig) -> EngineResult<AiEndpointConfig> {
+    if endpoint.url.trim().is_empty() || endpoint.model.trim().is_empty() {
+        return Err(EngineError::Validation(
+            "AI unavailable - configure endpoint and model in Settings".to_string(),
+        ));
+    }
+    Ok(endpoint)
+}
+
+fn chat_completions_url(base_url: &str) -> String {
+    let base = base_url.trim_end_matches('/');
+    if base.ends_with("/chat/completions") {
+        base.to_string()
+    } else if base.ends_with("/v1") {
+        format!("{base}/chat/completions")
+    } else {
+        format!("{base}/v1/chat/completions")
+    }
+}
+
+fn event_boundary(buffer: &[u8]) -> Option<(usize, usize)> {
+    buffer
+        .windows(4)
+        .position(|window| window == b"\r\n\r\n")
+        .map(|position| (position, 4))
+        .or_else(|| {
+            buffer
+                .windows(2)
+                .position(|window| window == b"\n\n")
+                .map(|position| (position, 2))
+        })
+}
+
+fn in_flight() -> &'static Mutex<HashMap<String, Arc<AtomicBool>>> {
+    static IN_FLIGHT: OnceLock<Mutex<HashMap<String, Arc<AtomicBool>>>> = OnceLock::new();
+    IN_FLIGHT.get_or_init(|| Mutex::new(HashMap::new()))
+}
+
+fn listeners() -> &'static Mutex<Vec<mpsc::Sender<ChatEvent>>> {
+    static LISTENERS: OnceLock<Mutex<Vec<mpsc::Sender<ChatEvent>>>> = OnceLock::new();
+    LISTENERS.get_or_init(|| Mutex::new(Vec::new()))
+}
+
+fn emit(options: &ChatSendOptions, event: ChatEvent) {
+    if let Some(handler) = options.event_handler.as_deref() {
+        handler(event.clone());
+    }
+    listeners()
+        .lock()
+        .expect("chat listeners lock")
+        .retain(|sender| sender.send(event.clone()).is_ok());
+}
+
+struct InFlightGuard(String);
+
+impl Drop for InFlightGuard {
+    fn drop(&mut self) {
+        in_flight()
+            .lock()
+            .expect("chat cancellation lock")
+            .remove(&self.0);
+    }
+}

crates/bds-core/src/engine/chat_tools.rs

@@ -0,0 +1,861 @@
+use std::collections::{BTreeMap, BTreeSet};
+use std::fs;
+use std::path::Path;
+
+use base64::Engine as _;
+use diesel::prelude::*;
+use serde_json::{Value, json};
+
+use crate::db::DbConnection as Connection;
+use crate::db::queries::{media, post, post_link, post_media, script, template};
+use crate::db::schema::ai_models;
+use crate::engine::{EngineError, EngineResult};
+use crate::util::frontmatter::read_post_file;
+
+pub fn model_supports_tools(conn: &Connection, model: &str) -> EngineResult<bool> {
+    let catalog_value = conn.with(|connection| {
+        ai_models::table
+            .filter(ai_models::model_id.eq(model))
+            .select(ai_models::tool_call)
+            .first::<i32>(connection)
+            .optional()
+    })?;
+    Ok(catalog_value.map_or_else(
+        || {
+            let model = model.to_ascii_lowercase();
+            model.contains("gpt")
+                || model.contains("claude")
+                || model.contains("tool")
+                || model.contains("qwen")
+                || model.contains("mistral")
+        },
+        |value| value != 0,
+    ))
+}
+
+pub fn system_prompt(conn: &Connection, project_id: &str) -> EngineResult<String> {
+    let posts = post::list_posts_by_project(conn, project_id)?;
+    let media_count = media::count_media_by_project(conn, project_id)?;
+    let tags = posts
+        .iter()
+        .flat_map(|post| post.tags.iter())
+        .collect::<BTreeSet<_>>()
+        .len();
+    let categories = posts
+        .iter()
+        .flat_map(|post| post.categories.iter())
+        .collect::<BTreeSet<_>>()
+        .len();
+    let configured = crate::engine::settings::get(conn, "ai.system_prompt")?.unwrap_or_default();
+    let contract = format!(
+        "You are the conversational assistant for this blog project. Use tools when facts from the project are needed. Never invent project content or identifiers. There are {} posts, {media_count} media items, {tags} tags, and {categories} categories. Keep answers concise and use GitHub-flavored Markdown when useful.",
+        posts.len()
+    );
+    Ok(if configured.trim().is_empty() {
+        contract
+    } else {
+        format!("{}\n\n{contract}", configured.trim())
+    })
+}
+
+pub fn tool_specs() -> Vec<Value> {
+    vec![
+        spec(
+            "get_blog_stats",
+            "Return aggregate project statistics.",
+            json!({}),
+        ),
+        spec(
+            "check_term",
+            "Check whether a term is used as a tag or category.",
+            json!({"term": {"type": "string"}}),
+        ),
+        spec(
+            "search_posts",
+            "Search post titles, slugs, excerpts, bodies, tags, and categories.",
+            json!({"query": {"type": "string"}, "language": {"type": "string"}, "limit": {"type": "integer"}}),
+        ),
+        spec(
+            "read_post",
+            "Read one post by id.",
+            json!({"post_id": {"type": "string"}}),
+        ),
+        spec(
+            "read_post_by_slug",
+            "Read one post by slug.",
+            json!({"slug": {"type": "string"}}),
+        ),
+        spec(
+            "list_posts",
+            "List posts, optionally filtering by status, tag, or category.",
+            json!({"status": {"type": "string"}, "tag": {"type": "string"}, "category": {"type": "string"}, "limit": {"type": "integer"}}),
+        ),
+        spec(
+            "count_posts",
+            "Count posts and optionally group by status, tag, or category.",
+            json!({"group_by": {"type": "string", "enum": ["status", "tag", "category"]}}),
+        ),
+        spec(
+            "update_post_metadata",
+            "Update title, excerpt, tags, or categories on a post.",
+            json!({"post_id": {"type": "string"}, "title": {"type": "string"}, "excerpt": {"type": ["string", "null"]}, "tags": {"type": "array", "items": {"type": "string"}}, "categories": {"type": "array", "items": {"type": "string"}}}),
+        ),
+        spec(
+            "list_media",
+            "List project media.",
+            json!({"limit": {"type": "integer"}}),
+        ),
+        spec(
+            "get_media",
+            "Get one media item.",
+            json!({"media_id": {"type": "string"}}),
+        ),
+        spec(
+            "view_image",
+            "Return a local image thumbnail as a data URL for visual inspection.",
+            json!({"media_id": {"type": "string"}, "size": {"type": "string", "enum": ["small", "medium", "large"]}}),
+        ),
+        spec(
+            "update_media_metadata",
+            "Update title, alt text, caption, or tags on media.",
+            json!({"media_id": {"type": "string"}, "title": {"type": ["string", "null"]}, "alt": {"type": ["string", "null"]}, "caption": {"type": ["string", "null"]}, "tags": {"type": "array", "items": {"type": "string"}}}),
+        ),
+        spec("list_tags", "List tags and usage counts.", json!({})),
+        spec(
+            "list_categories",
+            "List categories and usage counts.",
+            json!({}),
+        ),
+        spec(
+            "get_post_backlinks",
+            "Get posts that link to a post.",
+            json!({"post_id": {"type": "string"}}),
+        ),
+        spec(
+            "get_post_outlinks",
+            "Get posts linked from a post.",
+            json!({"post_id": {"type": "string"}}),
+        ),
+        spec(
+            "get_post_media",
+            "Get media linked to a post.",
+            json!({"post_id": {"type": "string"}}),
+        ),
+        spec(
+            "get_media_posts",
+            "Get posts that use a media item.",
+            json!({"media_id": {"type": "string"}}),
+        ),
+        spec("list_templates", "List templates.", json!({})),
+        spec(
+            "read_template",
+            "Read a template by id.",
+            json!({"template_id": {"type": "string"}}),
+        ),
+        spec("list_scripts", "List scripts.", json!({})),
+        spec(
+            "read_script",
+            "Read a script by id.",
+            json!({"script_id": {"type": "string"}}),
+        ),
+        spec(
+            "navigate",
+            "Open a project area or entity in the application.",
+            json!({
+                "action": {"type": "string", "enum": ["open_post", "open_media", "open_settings", "open_chat", "switch_view", "toggle_sidebar", "toggle_panel", "toggle_assistant_sidebar"]},
+                "destination": {"type": "string", "enum": ["posts", "pages", "media", "templates", "scripts", "tags", "chat", "import", "git", "settings"]},
+                "entity_id": {"type": "string"},
+                "value": {"type": "string"}
+            }),
+        ),
+    ]
+}
+
+pub fn execute(
+    conn: &Connection,
+    data_dir: &Path,
+    project_id: &str,
+    name: &str,
+    arguments: &Value,
+) -> EngineResult<Value> {
+    match name {
+        "blog_stats" | "get_blog_stats" => blog_stats(conn, project_id),
+        "check_term" => check_term(conn, project_id, required_str(arguments, "term")?),
+        "search_posts" => search_posts(conn, project_id, arguments),
+        "read_post" => {
+            let item = post::get_post_by_id(conn, required_id(arguments, "post_id", "postId")?)?;
+            ensure_project(&item.project_id, project_id)?;
+            post_detail(data_dir, item)
+        }
+        "read_post_by_slug" => {
+            let item = post::get_post_by_project_and_slug(
+                conn,
+                project_id,
+                required_str(arguments, "slug")?,
+            )?;
+            post_detail(data_dir, item)
+        }
+        "list_posts" => list_posts(conn, project_id, arguments),
+        "count_posts" => count_posts(conn, project_id, arguments),
+        "update_post_metadata" => update_post_metadata(conn, data_dir, project_id, arguments),
+        "list_media" => list_media(conn, project_id, arguments),
+        "get_media" => {
+            let item =
+                media::get_media_by_id(conn, required_id(arguments, "media_id", "mediaId")?)?;
+            ensure_project(&item.project_id, project_id)?;
+            Ok(json!({"success": true, "media": item}))
+        }
+        "view_image" => view_image(conn, data_dir, project_id, arguments),
+        "update_media_metadata" => update_media_metadata(conn, data_dir, project_id, arguments),
+        "list_tags" => counted_terms(conn, project_id, true),
+        "list_categories" => counted_terms(conn, project_id, false),
+        "get_post_backlinks" => post_links(conn, project_id, arguments, true),
+        "get_post_outlinks" => post_links(conn, project_id, arguments, false),
+        "get_post_media" => linked_media(conn, project_id, arguments),
+        "get_media_posts" => linked_posts(conn, project_id, arguments),
+        "list_templates" => Ok(json!({
+            "templates": template::list_templates_by_project(conn, project_id)?,
+        })),
+        "read_template" => {
+            let item = template::get_template_by_id(
+                conn,
+                required_id(arguments, "template_id", "templateId")?,
+            )?;
+            ensure_project(&item.project_id, project_id)?;
+            Ok(json!({"success": true, "template": item}))
+        }
+        "list_scripts" => Ok(json!({
+            "scripts": script::list_scripts_by_project(conn, project_id)?,
+        })),
+        "read_script" => {
+            let item =
+                script::get_script_by_id(conn, required_id(arguments, "script_id", "scriptId")?)?;
+            ensure_project(&item.project_id, project_id)?;
+            Ok(json!({"success": true, "script": item}))
+        }
+        "navigate" => navigate(arguments),
+        _ => Ok(json!({"success": false, "error": "unknown_tool", "name": name})),
+    }
+}
+
+fn blog_stats(conn: &Connection, project_id: &str) -> EngineResult<Value> {
+    let posts = post::list_posts_by_project(conn, project_id)?;
+    let media_count = media::count_media_by_project(conn, project_id)?;
+    let templates = template::list_templates_by_project(conn, project_id)?.len();
+    let scripts = script::list_scripts_by_project(conn, project_id)?.len();
+    let tags = posts
+        .iter()
+        .flat_map(|item| &item.tags)
+        .collect::<BTreeSet<_>>()
+        .len();
+    let categories = posts
+        .iter()
+        .flat_map(|item| &item.categories)
+        .collect::<BTreeSet<_>>()
+        .len();
+    Ok(json!({
+        "posts": posts.len(), "media": media_count, "templates": templates,
+        "scripts": scripts, "tags": tags, "categories": categories,
+    }))
+}
+
+fn check_term(conn: &Connection, project_id: &str, term: &str) -> EngineResult<Value> {
+    let term = term.to_lowercase();
+    let posts = post::list_posts_by_project(conn, project_id)?;
+    let tag_count = posts
+        .iter()
+        .filter(|item| item.tags.iter().any(|value| value.to_lowercase() == term))
+        .count();
+    let category_count = posts
+        .iter()
+        .filter(|item| {
+            item.categories
+                .iter()
+                .any(|value| value.to_lowercase() == term)
+        })
+        .count();
+    Ok(json!({"term": term, "tag_posts": tag_count, "category_posts": category_count}))
+}
+
+fn search_posts(conn: &Connection, project_id: &str, arguments: &Value) -> EngineResult<Value> {
+    let query = required_str(arguments, "query")?;
+    let language = arguments
+        .get("language")
+        .and_then(Value::as_str)
+        .unwrap_or("en");
+    let limit = limit(arguments);
+    let mut matches = Vec::new();
+    for id in crate::db::fts::search_posts(conn, query, language)? {
+        if let Ok(item) = post::get_post_by_id(conn, &id)
+            && item.project_id == project_id
+        {
+            matches.push(post_summary(&item));
+            if matches.len() == limit {
+                break;
+            }
+        }
+    }
+    Ok(json!({"posts": matches, "count": matches.len()}))
+}
+
+fn list_posts(conn: &Connection, project_id: &str, arguments: &Value) -> EngineResult<Value> {
+    let status = arguments.get("status").and_then(Value::as_str);
+    let tag = arguments.get("tag").and_then(Value::as_str);
+    let category = arguments.get("category").and_then(Value::as_str);
+    let items = post::list_posts_by_project(conn, project_id)?
+        .into_iter()
+        .filter(|item| status.is_none_or(|value| item.status.as_str() == value))
+        .filter(|item| tag.is_none_or(|value| contains_case_insensitive(&item.tags, value)))
+        .filter(|item| {
+            category.is_none_or(|value| contains_case_insensitive(&item.categories, value))
+        })
+        .take(limit(arguments))
+        .map(|item| post_summary(&item))
+        .collect::<Vec<_>>();
+    Ok(json!({"posts": items, "count": items.len()}))
+}
+
+fn count_posts(conn: &Connection, project_id: &str, arguments: &Value) -> EngineResult<Value> {
+    let items = post::list_posts_by_project(conn, project_id)?;
+    let Some(group_by) = arguments
+        .get("group_by")
+        .or_else(|| arguments.get("groupBy"))
+        .and_then(Value::as_str)
+    else {
+        return Ok(json!({"total_posts": items.len()}));
+    };
+    let mut groups = BTreeMap::<String, usize>::new();
+    for item in &items {
+        let values: Vec<String> = match group_by {
+            "status" => vec![item.status.as_str().to_string()],
+            "tag" => item.tags.clone(),
+            "category" => item.categories.clone(),
+            _ => {
+                return Err(EngineError::Validation(format!(
+                    "unsupported post grouping: {group_by}"
+                )));
+            }
+        };
+        for value in values {
+            *groups.entry(value).or_default() += 1;
+        }
+    }
+    Ok(json!({"total_posts": items.len(), "group_by": group_by, "groups": groups}))
+}
+
+fn update_post_metadata(
+    conn: &Connection,
+    data_dir: &Path,
+    project_id: &str,
+    arguments: &Value,
+) -> EngineResult<Value> {
+    let id = required_id(arguments, "post_id", "postId")?;
+    let existing = post::get_post_by_id(conn, id)?;
+    ensure_project(&existing.project_id, project_id)?;
+    if !["title", "excerpt", "tags", "categories"]
+        .iter()
+        .any(|key| arguments.get(key).is_some())
+    {
+        return Err(EngineError::Validation(
+            "no post metadata updates provided".to_string(),
+        ));
+    }
+    let excerpt = optional_nullable_str(arguments, "excerpt")?;
+    let item = crate::engine::post::update_post(
+        conn,
+        data_dir,
+        id,
+        arguments.get("title").and_then(Value::as_str),
+        None,
+        excerpt,
+        None,
+        optional_string_array(arguments, "tags")?,
+        optional_string_array(arguments, "categories")?,
+        None,
+        None,
+        None,
+        None,
+    )?;
+    Ok(json!({"success": true, "post": post_summary(&item)}))
+}
+
+fn list_media(conn: &Connection, project_id: &str, arguments: &Value) -> EngineResult<Value> {
+    let items = media::list_media_by_project(conn, project_id)?
+        .into_iter()
+        .take(limit(arguments))
+        .collect::<Vec<_>>();
+    Ok(json!({"media": items, "count": items.len()}))
+}
+
+fn update_media_metadata(
+    conn: &Connection,
+    data_dir: &Path,
+    project_id: &str,
+    arguments: &Value,
+) -> EngineResult<Value> {
+    let id = required_id(arguments, "media_id", "mediaId")?;
+    let existing = media::get_media_by_id(conn, id)?;
+    ensure_project(&existing.project_id, project_id)?;
+    if !["title", "alt", "caption", "tags"]
+        .iter()
+        .any(|key| arguments.get(key).is_some())
+    {
+        return Err(EngineError::Validation(
+            "no media metadata updates provided".to_string(),
+        ));
+    }
+    let item = crate::engine::media::update_media(
+        conn,
+        data_dir,
+        id,
+        optional_nullable_str(arguments, "title")?,
+        optional_nullable_str(arguments, "alt")?,
+        optional_nullable_str(arguments, "caption")?,
+        None,
+        None,
+        optional_string_array(arguments, "tags")?,
+    )?;
+    Ok(json!({"success": true, "media": item}))
+}
+
+fn view_image(
+    conn: &Connection,
+    data_dir: &Path,
+    project_id: &str,
+    arguments: &Value,
+) -> EngineResult<Value> {
+    let item = media::get_media_by_id(conn, required_id(arguments, "media_id", "mediaId")?)?;
+    ensure_project(&item.project_id, project_id)?;
+    if !item.mime_type.starts_with("image/") {
+        return Ok(json!({"success": false, "error": "not_image", "mime_type": item.mime_type}));
+    }
+    let size = arguments
+        .get("size")
+        .and_then(Value::as_str)
+        .unwrap_or("medium");
+    if !["small", "medium", "large"].contains(&size) {
+        return Err(EngineError::Validation(format!(
+            "unsupported thumbnail size: {size}"
+        )));
+    }
+    let path = data_dir.join(crate::util::thumbnail_path(&item.id, size, "webp"));
+    if !path.is_file() {
+        return Ok(json!({"success": false, "error": "thumbnail_not_available"}));
+    }
+    let encoded = base64::engine::general_purpose::STANDARD.encode(fs::read(path)?);
+    Ok(json!({
+        "success": true,
+        "media": item,
+        "data_url": format!("data:image/webp;base64,{encoded}"),
+    }))
+}
+
+fn post_links(
+    conn: &Connection,
+    project_id: &str,
+    arguments: &Value,
+    incoming: bool,
+) -> EngineResult<Value> {
+    let id = required_id(arguments, "post_id", "postId")?;
+    let source = post::get_post_by_id(conn, id)?;
+    ensure_project(&source.project_id, project_id)?;
+    let links = if incoming {
+        post_link::list_links_by_target(conn, id)?
+    } else {
+        post_link::list_links_by_source(conn, id)?
+    };
+    let mut items = Vec::with_capacity(links.len());
+    for link in links {
+        let linked_id = if incoming {
+            &link.source_post_id
+        } else {
+            &link.target_post_id
+        };
+        let linked = post::get_post_by_id(conn, linked_id)?;
+        ensure_project(&linked.project_id, project_id)?;
+        items.push(json!({
+            "post": post_summary(&linked),
+            "link_text": link.link_text,
+        }));
+    }
+    if incoming {
+        Ok(json!({"success": true, "post_id": id, "linked_by": items}))
+    } else {
+        Ok(json!({"success": true, "post_id": id, "links_to": items}))
+    }
+}
+
+fn linked_media(conn: &Connection, project_id: &str, arguments: &Value) -> EngineResult<Value> {
+    let id = required_id(arguments, "post_id", "postId")?;
+    let item = post::get_post_by_id(conn, id)?;
+    ensure_project(&item.project_id, project_id)?;
+    let mut items = Vec::new();
+    for link in post_media::list_post_media_by_post(conn, id)? {
+        ensure_project(&link.project_id, project_id)?;
+        let item = media::get_media_by_id(conn, &link.media_id)?;
+        ensure_project(&item.project_id, project_id)?;
+        items.push(json!({"media": item, "sort_order": link.sort_order}));
+    }
+    Ok(json!({"success": true, "post_id": id, "media": items}))
+}
+
+fn linked_posts(conn: &Connection, project_id: &str, arguments: &Value) -> EngineResult<Value> {
+    let id = required_id(arguments, "media_id", "mediaId")?;
+    let item = media::get_media_by_id(conn, id)?;
+    ensure_project(&item.project_id, project_id)?;
+    let mut items = Vec::new();
+    for link in post_media::list_post_media_by_media(conn, id)? {
+        ensure_project(&link.project_id, project_id)?;
+        let item = post::get_post_by_id(conn, &link.post_id)?;
+        ensure_project(&item.project_id, project_id)?;
+        items.push(json!({"post": post_summary(&item), "sort_order": link.sort_order}));
+    }
+    Ok(json!({"success": true, "media_id": id, "posts": items}))
+}
+
+fn counted_terms(conn: &Connection, project_id: &str, tags: bool) -> EngineResult<Value> {
+    let mut counts = BTreeMap::<String, usize>::new();
+    for item in post::list_posts_by_project(conn, project_id)? {
+        for term in if tags { &item.tags } else { &item.categories } {
+            *counts.entry(term.clone()).or_default() += 1;
+        }
+    }
+    let values = counts
+        .into_iter()
+        .map(|(name, count)| json!({"name": name, "count": count}))
+        .collect::<Vec<_>>();
+    Ok(if tags {
+        json!({"tags": values, "count": values.len()})
+    } else {
+        json!({"categories": values, "count": values.len()})
+    })
+}
+
+fn navigate(arguments: &Value) -> EngineResult<Value> {
+    let action = arguments.get("action").and_then(Value::as_str);
+    let value = arguments
+        .get("value")
+        .or_else(|| arguments.get("entity_id"))
+        .or_else(|| arguments.get("entityId"))
+        .and_then(Value::as_str);
+    let (destination, entity_id) = match action {
+        Some("open_post" | "openPost") => ("posts", required_navigation_value(value, "post")?),
+        Some("open_media" | "openMedia") => ("media", required_navigation_value(value, "media")?),
+        Some("open_chat" | "openChat") => ("chat", required_navigation_value(value, "chat")?),
+        Some("open_settings" | "openSettings") => ("settings", None),
+        Some("switch_view" | "switchView") => {
+            (required_navigation_value(value, "view")?.unwrap(), None)
+        }
+        Some("toggle_sidebar" | "toggleSidebar") => ("toggle_sidebar", None),
+        Some("toggle_panel" | "togglePanel") => ("toggle_panel", None),
+        Some("toggle_assistant_sidebar" | "toggleAssistantSidebar") => {
+            ("toggle_assistant_sidebar", None)
+        }
+        Some(action) => {
+            return Err(EngineError::Validation(format!(
+                "unsupported navigation action: {action}"
+            )));
+        }
+        None => (required_str(arguments, "destination")?, value),
+    };
+    if ![
+        "posts",
+        "pages",
+        "media",
+        "templates",
+        "scripts",
+        "tags",
+        "chat",
+        "import",
+        "git",
+        "settings",
+        "toggle_sidebar",
+        "toggle_panel",
+        "toggle_assistant_sidebar",
+    ]
+    .contains(&destination)
+    {
+        return Err(EngineError::Validation(format!(
+            "unsupported navigation destination: {destination}"
+        )));
+    }
+    Ok(json!({
+        "success": true,
+        "navigation": {
+            "destination": destination,
+            "entity_id": entity_id,
+        }
+    }))
+}
+
+fn post_detail(data_dir: &Path, item: crate::model::Post) -> EngineResult<Value> {
+    let body = post_body(data_dir, &item)?;
+    Ok(json!({"success": true, "post": item, "body": body}))
+}
+
+fn post_body(data_dir: &Path, item: &crate::model::Post) -> EngineResult<String> {
+    if let Some(content) = item.content.as_deref() {
+        return Ok(content.to_string());
+    }
+    if item.file_path.is_empty() {
+        return Ok(String::new());
+    }
+    let raw = fs::read_to_string(data_dir.join(&item.file_path))?;
+    let (_, body) = read_post_file(&raw)
+        .map_err(|error| EngineError::Parse(format!("invalid post file: {error}")))?;
+    Ok(body)
+}
+
+fn post_summary(item: &crate::model::Post) -> Value {
+    json!({
+        "id": item.id, "title": item.title, "slug": item.slug,
+        "excerpt": item.excerpt, "status": item.status, "tags": item.tags,
+        "categories": item.categories, "created_at": item.created_at,
+        "updated_at": item.updated_at,
+    })
+}
+
+fn spec(name: &str, description: &str, properties: Value) -> Value {
+    let required = properties
+        .as_object()
+        .into_iter()
+        .flat_map(|values| values.iter())
+        .filter(|(_, schema)| !schema.get("type").is_some_and(Value::is_array))
+        .filter(|(name, _)| {
+            matches!(
+                name.as_str(),
+                "term"
+                    | "query"
+                    | "post_id"
+                    | "slug"
+                    | "media_id"
+                    | "template_id"
+                    | "script_id"
+                    | "destination"
+            )
+        })
+        .map(|(name, _)| Value::String(name.clone()))
+        .collect::<Vec<_>>();
+    let required = if name == "navigate" {
+        Vec::new()
+    } else {
+        required
+    };
+    json!({
+        "type": "function",
+        "function": {
+            "name": name,
+            "description": description,
+            "parameters": {
+                "type": "object",
+                "properties": properties,
+                "required": required,
+                "additionalProperties": false,
+            }
+        }
+    })
+}
+
+fn required_navigation_value<'a>(
+    value: Option<&'a str>,
+    target: &str,
+) -> EngineResult<Option<&'a str>> {
+    value
+        .filter(|value| !value.trim().is_empty())
+        .map(Some)
+        .ok_or_else(|| {
+            EngineError::Validation(format!("navigation {target} identifier is required"))
+        })
+}
+
+fn required_str<'a>(arguments: &'a Value, key: &str) -> EngineResult<&'a str> {
+    arguments
+        .get(key)
+        .and_then(Value::as_str)
+        .filter(|value| !value.trim().is_empty())
+        .ok_or_else(|| EngineError::Validation(format!("tool argument {key} is required")))
+}
+
+fn required_id<'a>(arguments: &'a Value, snake: &str, camel: &str) -> EngineResult<&'a str> {
+    arguments
+        .get(snake)
+        .or_else(|| arguments.get(camel))
+        .and_then(Value::as_str)
+        .filter(|value| !value.trim().is_empty())
+        .ok_or_else(|| EngineError::Validation(format!("tool argument {snake} is required")))
+}
+
+fn ensure_project(actual: &str, expected: &str) -> EngineResult<()> {
+    if actual == expected {
+        Ok(())
+    } else {
+        Err(EngineError::NotFound("project entity".to_string()))
+    }
+}
+
+fn limit(arguments: &Value) -> usize {
+    arguments
+        .get("limit")
+        .and_then(Value::as_u64)
+        .unwrap_or(25)
+        .clamp(1, 100) as usize
+}
+
+fn contains_case_insensitive(values: &[String], needle: &str) -> bool {
+    values
+        .iter()
+        .any(|value| value.eq_ignore_ascii_case(needle))
+}
+
+fn optional_string_array(arguments: &Value, key: &str) -> EngineResult<Option<Vec<String>>> {
+    let Some(value) = arguments.get(key) else {
+        return Ok(None);
+    };
+    let values = value
+        .as_array()
+        .ok_or_else(|| EngineError::Validation(format!("tool argument {key} must be an array")))?
+        .iter()
+        .map(|value| {
+            value.as_str().map(str::to_string).ok_or_else(|| {
+                EngineError::Validation(format!("tool argument {key} must contain strings"))
+            })
+        })
+        .collect::<EngineResult<Vec<_>>>()?;
+    Ok(Some(values))
+}
+
+fn optional_nullable_str<'a>(
+    arguments: &'a Value,
+    key: &str,
+) -> EngineResult<Option<Option<&'a str>>> {
+    match arguments.get(key) {
+        None => Ok(None),
+        Some(Value::Null) => Ok(Some(None)),
+        Some(Value::String(value)) => Ok(Some(Some(value))),
+        Some(_) => Err(EngineError::Validation(format!(
+            "tool argument {key} must be a string or null"
+        ))),
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::db::Database;
+    use crate::db::queries::media::{insert_media, make_test_media};
+    use crate::db::queries::post::{insert_post, make_test_post};
+    use crate::db::queries::post_link::insert_post_link;
+    use crate::db::queries::post_media::link_media;
+    use crate::db::queries::project::{insert_project, make_test_project};
+    use crate::model::{PostLink, PostMedia};
+
+    fn setup() -> Database {
+        let db = Database::open_in_memory().unwrap();
+        db.migrate().unwrap();
+        insert_project(db.conn(), &make_test_project("p1", "blog")).unwrap();
+        insert_post(db.conn(), &make_test_post("source", "p1", "source")).unwrap();
+        insert_post(db.conn(), &make_test_post("target", "p1", "target")).unwrap();
+        insert_media(db.conn(), &make_test_media("media1", "p1")).unwrap();
+        insert_post_link(
+            db.conn(),
+            &PostLink {
+                id: "link1".into(),
+                source_post_id: "source".into(),
+                target_post_id: "target".into(),
+                link_text: Some("read next".into()),
+                created_at: 1,
+            },
+        )
+        .unwrap();
+        link_media(
+            db.conn(),
+            &PostMedia {
+                id: "post-media1".into(),
+                project_id: "p1".into(),
+                post_id: "source".into(),
+                media_id: "media1".into(),
+                sort_order: 3,
+                created_at: 1,
+            },
+        )
+        .unwrap();
+        db
+    }
+
+    #[test]
+    fn relationship_tools_return_project_entities() {
+        let db = setup();
+        let dir = tempfile::tempdir().unwrap();
+        let outlinks = execute(
+            db.conn(),
+            dir.path(),
+            "p1",
+            "get_post_outlinks",
+            &json!({"post_id": "source"}),
+        )
+        .unwrap();
+        assert_eq!(outlinks["links_to"][0]["post"]["id"], "target");
+        assert_eq!(outlinks["links_to"][0]["link_text"], "read next");
+
+        let backlinks = execute(
+            db.conn(),
+            dir.path(),
+            "p1",
+            "get_post_backlinks",
+            &json!({"post_id": "target"}),
+        )
+        .unwrap();
+        assert_eq!(backlinks["linked_by"][0]["post"]["id"], "source");
+
+        let post_media = execute(
+            db.conn(),
+            dir.path(),
+            "p1",
+            "get_post_media",
+            &json!({"post_id": "source"}),
+        )
+        .unwrap();
+        assert_eq!(post_media["media"][0]["media"]["id"], "media1");
+        assert_eq!(post_media["media"][0]["sort_order"], 3);
+
+        let media_posts = execute(
+            db.conn(),
+            dir.path(),
+            "p1",
+            "get_media_posts",
+            &json!({"media_id": "media1"}),
+        )
+        .unwrap();
+        assert_eq!(media_posts["posts"][0]["post"]["id"], "source");
+    }
+
+    #[test]
+    fn view_image_is_bounded_to_generated_image_thumbnails() {
+        let db = setup();
+        let dir = tempfile::tempdir().unwrap();
+        let relative = crate::util::thumbnail_path("media1", "medium", "webp");
+        let path = dir.path().join(relative);
+        fs::create_dir_all(path.parent().unwrap()).unwrap();
+        fs::write(&path, b"thumbnail").unwrap();
+
+        let result = execute(
+            db.conn(),
+            dir.path(),
+            "p1",
+            "view_image",
+            &json!({"media_id": "media1", "size": "medium"}),
+        )
+        .unwrap();
+        assert_eq!(result["success"], true);
+        assert_eq!(result["data_url"], "data:image/webp;base64,dGh1bWJuYWls");
+
+        let invalid = execute(
+            db.conn(),
+            dir.path(),
+            "p1",
+            "view_image",
+            &json!({"media_id": "media1", "size": "original"}),
+        );
+        assert!(matches!(invalid, Err(EngineError::Validation(_))));
+    }
+}

crates/bds-core/src/engine/git.rs

@@ -1635,7 +1635,7 @@ mod tests {
             dir.path(),
             &executable,
             Duration::from_secs(1),
-            Duration::from_secs(1),
+            Duration::from_secs(3),
         );
         let error = engine.fetch(|| false, |_| {}).unwrap_err();
         assert!(
@@ -1658,7 +1658,7 @@ mod tests {
             dir.path(),
             executable,
             Duration::from_secs(1),
-            Duration::from_secs(1),
+            Duration::from_secs(3),
         );
         let error = engine
             .push(

crates/bds-core/src/engine/mod.rs

@@ -2,6 +2,8 @@ pub mod ai;
 pub mod auto_translation;
 pub mod blogmark;
 pub mod calendar;
+pub mod chat;
+mod chat_tools;
 pub mod cli_launcher;
 pub mod cli_sync;
 pub mod domain_events;

crates/bds-core/src/model/chat.rs

@@ -0,0 +1,109 @@
+use serde::{Deserialize, Serialize};
+
+#[derive(
+    Debug,
+    Clone,
+    Copy,
+    PartialEq,
+    Eq,
+    Serialize,
+    Deserialize,
+    diesel::AsExpression,
+    diesel::FromSqlRow,
+)]
+#[diesel(sql_type = diesel::sql_types::Text)]
+#[serde(rename_all = "lowercase")]
+pub enum ChatRole {
+    System,
+    User,
+    Assistant,
+    Tool,
+}
+
+impl ChatRole {
+    pub const fn as_str(self) -> &'static str {
+        match self {
+            Self::System => "system",
+            Self::User => "user",
+            Self::Assistant => "assistant",
+            Self::Tool => "tool",
+        }
+    }
+}
+
+impl std::str::FromStr for ChatRole {
+    type Err = String;
+
+    fn from_str(value: &str) -> Result<Self, Self::Err> {
+        match value {
+            "system" => Ok(Self::System),
+            "user" => Ok(Self::User),
+            "assistant" => Ok(Self::Assistant),
+            "tool" => Ok(Self::Tool),
+            _ => Err(format!("invalid chat role: {value}")),
+        }
+    }
+}
+
+#[derive(
+    Debug, Clone, PartialEq, Eq, Serialize, Deserialize, diesel::Queryable, diesel::Selectable,
+)]
+#[diesel(
+    table_name = crate::db::schema::chat_conversations,
+    check_for_backend(diesel::sqlite::Sqlite)
+)]
+pub struct ChatConversation {
+    pub id: String,
+    pub title: String,
+    pub model: Option<String>,
+    pub copilot_session_id: Option<String>,
+    pub created_at: i64,
+    pub updated_at: i64,
+}
+
+#[derive(Debug, diesel::Insertable)]
+#[diesel(table_name = crate::db::schema::chat_conversations)]
+pub struct NewChatConversation<'a> {
+    pub id: &'a str,
+    pub title: &'a str,
+    pub model: Option<&'a str>,
+    pub copilot_session_id: Option<&'a str>,
+    pub created_at: i64,
+    pub updated_at: i64,
+}
+
+#[derive(
+    Debug, Clone, PartialEq, Eq, Serialize, Deserialize, diesel::Queryable, diesel::Selectable,
+)]
+#[diesel(
+    table_name = crate::db::schema::chat_messages,
+    check_for_backend(diesel::sqlite::Sqlite)
+)]
+pub struct ChatMessage {
+    pub id: i32,
+    pub conversation_id: String,
+    pub role: ChatRole,
+    pub content: Option<String>,
+    pub tool_call_id: Option<String>,
+    pub tool_calls: Option<String>,
+    pub created_at: i64,
+    pub cache_read_tokens: Option<i32>,
+    pub cache_write_tokens: Option<i32>,
+    pub token_usage_input: Option<i32>,
+    pub token_usage_output: Option<i32>,
+}
+
+#[derive(Debug, diesel::Insertable)]
+#[diesel(table_name = crate::db::schema::chat_messages)]
+pub struct NewChatMessage<'a> {
+    pub conversation_id: &'a str,
+    pub role: ChatRole,
+    pub content: Option<&'a str>,
+    pub tool_call_id: Option<&'a str>,
+    pub tool_calls: Option<&'a str>,
+    pub created_at: i64,
+    pub cache_read_tokens: Option<i32>,
+    pub cache_write_tokens: Option<i32>,
+    pub token_usage_input: Option<i32>,
+    pub token_usage_output: Option<i32>,
+}

crates/bds-core/src/model/mod.rs

@@ -1,3 +1,4 @@
+mod chat;
 mod event;
 mod generation;
 mod import;
@@ -10,6 +11,7 @@ mod script;
 mod tag;
 mod template;
 
+pub use chat::{ChatConversation, ChatMessage, ChatRole, NewChatConversation, NewChatMessage};
 pub use event::DomainEvent;
 pub use generation::{
     DbNotification, DomainEntity, GeneratedFileHash, NotificationAction, NotificationEntity,

crates/bds-core/tests/chat.rs

@@ -0,0 +1,570 @@
+use bds_core::db::Database;
+use bds_core::engine::ai::{AiEndpointConfig, AiEndpointKind};
+use bds_core::engine::{chat, project};
+use bds_core::model::ChatRole;
+use std::io::{Read, Write};
+use std::net::TcpListener;
+use std::sync::Arc;
+use std::thread;
+use std::time::Duration;
+
+fn setup() -> (tempfile::TempDir, Database, String, std::path::PathBuf) {
+    let root = tempfile::tempdir().unwrap();
+    let database_path = root.path().join("bds.db");
+    let data_dir = root.path().join("project");
+    std::fs::create_dir_all(&data_dir).unwrap();
+    let db = Database::open(&database_path).unwrap();
+    db.migrate().unwrap();
+    let project = project::create_project(db.conn(), "Chat Test", data_dir.to_str()).unwrap();
+    project::set_active_project(db.conn(), &project.id).unwrap();
+    (root, db, project.id, data_dir)
+}
+
+#[test]
+fn conversation_repository_round_trips_rename_model_messages_and_delete() {
+    let (_root, db, _project_id, _data_dir) = setup();
+    let conversation = chat::create_conversation(db.conn(), Some("tool-model")).unwrap();
+    assert_eq!(conversation.title, "Chat with tool-model");
+    assert_eq!(conversation.model.as_deref(), Some("tool-model"));
+
+    let renamed = chat::rename_conversation(db.conn(), &conversation.id, "Rust notes").unwrap();
+    assert_eq!(renamed.title, "Rust notes");
+    chat::set_conversation_model(db.conn(), &conversation.id, "other-model").unwrap();
+    chat::insert_message(
+        db.conn(),
+        &conversation.id,
+        ChatRole::User,
+        Some("Hello"),
+        None,
+        None,
+        Default::default(),
+    )
+    .unwrap();
+
+    assert_eq!(chat::list_conversations(db.conn()).unwrap().len(), 1);
+    assert_eq!(
+        chat::list_messages(db.conn(), &conversation.id)
+            .unwrap()
+            .len(),
+        1
+    );
+    assert_eq!(
+        chat::list_messages(db.conn(), &conversation.id).unwrap()[0].role,
+        ChatRole::User
+    );
+    chat::delete_conversation(db.conn(), &conversation.id).unwrap();
+    assert!(chat::list_conversations(db.conn()).unwrap().is_empty());
+    assert!(
+        chat::list_messages(db.conn(), &conversation.id)
+            .unwrap()
+            .is_empty()
+    );
+}
+
+#[test]
+fn sse_assembler_handles_split_frames_multiple_tools_and_usage() {
+    let mut assembler = chat::SseAssembler::default();
+    assembler
+        .feed(b"data: {\"choices\":[{\"delta\":{\"content\":\"Hel")
+        .unwrap();
+    assembler
+        .feed(b"lo\"}}]}\n\ndata: {\"choices\":[{\"delta\":{\"tool_calls\":[{\"index\":0,\"id\":\"call-1\",\"function\":{\"name\":\"search_posts\",\"arguments\":\"{\\\"query\\\":\"}},{\"index\":1,\"id\":\"call-2\",\"function\":{\"name\":\"get_blog_stats\",\"arguments\":\"{}\"}}]}}]}\n\n")
+        .unwrap();
+    assembler
+        .feed(b"data: {\"choices\":[{\"delta\":{\"tool_calls\":[{\"index\":0,\"function\":{\"arguments\":\"\\\"rust\\\"}\"}}]}}],\"usage\":{\"prompt_tokens\":11,\"completion_tokens\":4,\"prompt_tokens_details\":{\"cached_tokens\":7},\"completion_tokens_details\":{\"cached_tokens\":2}}}\n\ndata: [DONE]\n\n")
+        .unwrap();
+    let assembled = assembler.finish().unwrap();
+    assert_eq!(assembled.content, "Hello");
+    assert_eq!(assembled.tool_calls.len(), 2);
+    assert_eq!(assembled.tool_calls[0].name, "search_posts");
+    assert_eq!(assembled.tool_calls[0].arguments["query"], "rust");
+    assert_eq!(assembled.usage.input_tokens, Some(11));
+    assert_eq!(assembled.usage.output_tokens, Some(4));
+    assert_eq!(assembled.usage.cache_read_tokens, Some(7));
+    assert_eq!(assembled.usage.cache_write_tokens, Some(2));
+}
+
+#[test]
+fn unavailable_endpoint_refuses_chat_without_mutating_transcript() {
+    let (_root, db, project_id, data_dir) = setup();
+    let conversation = chat::create_conversation(db.conn(), None).unwrap();
+    let result = chat::send_chat_message(
+        db.conn(),
+        &data_dir,
+        &project_id,
+        false,
+        &conversation.id,
+        "Hello",
+        chat::ChatSendOptions::default(),
+    );
+    assert!(result.is_err());
+    assert!(
+        chat::list_messages(db.conn(), &conversation.id)
+            .unwrap()
+            .is_empty()
+    );
+}
+
+#[test]
+fn streamed_turn_persists_content_session_and_all_token_fields() {
+    let (_root, db, project_id, data_dir) = setup();
+    let conversation = chat::create_conversation(db.conn(), Some("plain-model")).unwrap();
+    let (url, server) = serve(vec![MockResponse::delayed_sse(vec![
+        "data: {\"session_id\":\"session-7\",\"choices\":[{\"delta\":{\"content\":\"Hi \"}}]}\n\n",
+        "data: {\"choices\":[{\"delta\":{\"content\":\"there\"}}],\"usage\":{\"prompt_tokens\":12,\"completion_tokens\":3,\"cache_read_tokens\":4,\"cache_write_tokens\":2}}\n\n",
+        "data: [DONE]\n\n",
+    ])]);
+    let snapshots = Arc::new(std::sync::Mutex::new(Vec::new()));
+    let captured = Arc::clone(&snapshots);
+    let result = chat::send_chat_message(
+        db.conn(),
+        &data_dir,
+        &project_id,
+        false,
+        &conversation.id,
+        "Hello",
+        options(url, move |event| {
+            if let chat::ChatEvent::Content { content, .. } = event {
+                captured.lock().unwrap().push(content);
+            }
+        }),
+    )
+    .unwrap();
+    server.join().unwrap();
+
+    assert_eq!(result.content, "Hi there");
+    assert_eq!(&*snapshots.lock().unwrap(), &["Hi ", "Hi there"]);
+    let messages = chat::list_messages(db.conn(), &conversation.id).unwrap();
+    assert_eq!(messages.len(), 2);
+    assert_eq!(messages[1].content.as_deref(), Some("Hi there"));
+    assert_eq!(messages[1].token_usage_input, Some(12));
+    assert_eq!(messages[1].token_usage_output, Some(3));
+    assert_eq!(messages[1].cache_read_tokens, Some(4));
+    assert_eq!(messages[1].cache_write_tokens, Some(2));
+    assert_eq!(
+        chat::get_conversation(db.conn(), &conversation.id)
+            .unwrap()
+            .copilot_session_id
+            .as_deref(),
+        Some("session-7")
+    );
+}
+
+#[test]
+fn tool_loop_persists_valid_assistant_tool_pair_before_final_answer() {
+    let (_root, db, project_id, data_dir) = setup();
+    let conversation = chat::create_conversation(db.conn(), Some("tool-model")).unwrap();
+    let (url, server) = serve(vec![
+        MockResponse::sse(vec![
+            "data: {\"choices\":[{\"delta\":{\"tool_calls\":[{\"index\":0,\"id\":\"stats-1\",\"function\":{\"name\":\"get_blog_stats\",\"arguments\":\"{}\"}}]}}]}\n\n",
+            "data: [DONE]\n\n",
+        ]),
+        MockResponse::sse(vec![
+            "data: {\"choices\":[{\"delta\":{\"content\":\"There are no posts.\"}}]}\n\n",
+            "data: [DONE]\n\n",
+        ]),
+    ]);
+    let result = chat::send_chat_message(
+        db.conn(),
+        &data_dir,
+        &project_id,
+        false,
+        &conversation.id,
+        "How many posts?",
+        options(url, |_| {}),
+    )
+    .unwrap();
+    server.join().unwrap();
+
+    assert_eq!(result.content, "There are no posts.");
+    let messages = chat::list_messages(db.conn(), &conversation.id).unwrap();
+    assert_eq!(
+        messages.iter().map(|item| item.role).collect::<Vec<_>>(),
+        vec![
+            ChatRole::User,
+            ChatRole::Assistant,
+            ChatRole::Tool,
+            ChatRole::Assistant,
+        ]
+    );
+    assert!(
+        messages[1]
+            .tool_calls
+            .as_deref()
+            .unwrap()
+            .contains("stats-1")
+    );
+    assert_eq!(messages[2].tool_call_id.as_deref(), Some("stats-1"));
+    assert!(
+        messages[2]
+            .content
+            .as_deref()
+            .unwrap()
+            .contains("\"posts\":0")
+    );
+}
+
+#[test]
+fn malformed_stream_and_provider_error_keep_reopenable_user_turn() {
+    for response in [
+        MockResponse::sse(vec!["data: {not-json}\n\n"]),
+        MockResponse::status(500, "application/json", "{\"error\":\"down\"}"),
+    ] {
+        let (_root, db, project_id, data_dir) = setup();
+        let conversation = chat::create_conversation(db.conn(), Some("plain-model")).unwrap();
+        let (url, server) = serve(vec![response]);
+        assert!(
+            chat::send_chat_message(
+                db.conn(),
+                &data_dir,
+                &project_id,
+                false,
+                &conversation.id,
+                "Remember this",
+                options(url, |_| {}),
+            )
+            .is_err()
+        );
+        server.join().unwrap();
+        let messages = chat::list_messages(db.conn(), &conversation.id).unwrap();
+        assert_eq!(messages.len(), 1);
+        assert_eq!(messages[0].role, ChatRole::User);
+        assert_eq!(messages[0].content.as_deref(), Some("Remember this"));
+    }
+}
+
+#[test]
+fn cancellation_persists_only_received_content_and_never_runs_later_work() {
+    let (_root, db, project_id, data_dir) = setup();
+    let conversation = chat::create_conversation(db.conn(), Some("plain-model")).unwrap();
+    let conversation_id = conversation.id.clone();
+    let (url, server) = serve(vec![MockResponse::delayed_sse(vec![
+        "data: {\"choices\":[{\"delta\":{\"content\":\"Partial\"}}]}\n\n",
+        "data: {\"choices\":[{\"delta\":{\"content\":\" ignored\"}}]}\n\n",
+        "data: [DONE]\n\n",
+    ])]);
+    let cancel_id = conversation_id.clone();
+    let result = chat::send_chat_message(
+        db.conn(),
+        &data_dir,
+        &project_id,
+        false,
+        &conversation_id,
+        "Start",
+        options(url, move |event| {
+            if matches!(event, chat::ChatEvent::Content { .. }) {
+                chat::cancel_chat(&cancel_id);
+            }
+        }),
+    )
+    .unwrap();
+    server.join().unwrap();
+    assert!(result.cancelled);
+    assert_eq!(result.content, "Partial");
+    let messages = chat::list_messages(db.conn(), &conversation_id).unwrap();
+    assert_eq!(messages.len(), 2);
+    assert_eq!(messages[1].content.as_deref(), Some("Partial"));
+}
+
+#[test]
+fn context_truncation_keeps_system_and_complete_tool_pairs() {
+    let (_root, db, _project_id, _data_dir) = setup();
+    let conversation = chat::create_conversation(db.conn(), None).unwrap();
+    chat::insert_message(
+        db.conn(),
+        &conversation.id,
+        ChatRole::User,
+        Some(&"old ".repeat(100)),
+        None,
+        None,
+        Default::default(),
+    )
+    .unwrap();
+    chat::insert_message(
+        db.conn(),
+        &conversation.id,
+        ChatRole::Assistant,
+        Some("old answer"),
+        None,
+        None,
+        Default::default(),
+    )
+    .unwrap();
+    chat::insert_message(
+        db.conn(),
+        &conversation.id,
+        ChatRole::User,
+        Some("new question"),
+        None,
+        None,
+        Default::default(),
+    )
+    .unwrap();
+    chat::insert_message(db.conn(), &conversation.id, ChatRole::Assistant, None, None, Some("[{\"id\":\"c1\",\"type\":\"function\",\"function\":{\"name\":\"get_blog_stats\",\"arguments\":\"{}\"}}]"), Default::default()).unwrap();
+    chat::insert_message(
+        db.conn(),
+        &conversation.id,
+        ChatRole::Tool,
+        Some("{\"posts\":0}"),
+        Some("c1"),
+        None,
+        Default::default(),
+    )
+    .unwrap();
+    let context = chat::build_context(db.conn(), &_project_id, &conversation.id, 100).unwrap();
+    assert_eq!(context[0]["role"], "system");
+    assert!(context.iter().any(|item| item["content"] == "new question"));
+    let assistant_index = context
+        .iter()
+        .position(|item| item.get("tool_calls").is_some())
+        .unwrap();
+    assert_eq!(context[assistant_index + 1]["tool_call_id"], "c1");
+    assert!(!context.iter().any(|item| {
+        item["content"]
+            .as_str()
+            .is_some_and(|value| value.starts_with("old "))
+    }));
+}
+
+#[test]
+fn airplane_mode_selects_the_local_endpoint_and_persists_its_model() {
+    let (_root, db, project_id, data_dir) = setup();
+    let conversation = chat::create_conversation(db.conn(), None).unwrap();
+    let (url, server) = serve(vec![MockResponse::sse(vec![
+        "data: {\"choices\":[{\"delta\":{\"content\":\"Local answer\"}}]}\n\n",
+        "data: [DONE]\n\n",
+    ])]);
+    bds_core::engine::ai::save_endpoint(
+        db.conn(),
+        &AiEndpointConfig {
+            kind: AiEndpointKind::Airplane,
+            url,
+            model: "local-airplane-model".to_string(),
+            api_key: None,
+        },
+    )
+    .unwrap();
+
+    let result = chat::send_chat_message(
+        db.conn(),
+        &data_dir,
+        &project_id,
+        true,
+        &conversation.id,
+        "Stay offline",
+        Default::default(),
+    )
+    .unwrap();
+    server.join().unwrap();
+    assert_eq!(result.content, "Local answer");
+    assert_eq!(
+        chat::get_conversation(db.conn(), &conversation.id)
+            .unwrap()
+            .model
+            .as_deref(),
+        Some("local-airplane-model")
+    );
+}
+
+#[test]
+fn tool_round_limit_stops_without_leaving_an_unpaired_tool_call() {
+    let (_root, db, project_id, data_dir) = setup();
+    let conversation = chat::create_conversation(db.conn(), Some("tool-model")).unwrap();
+    let tool_frame = "data: {\"choices\":[{\"delta\":{\"tool_calls\":[{\"index\":0,\"id\":\"stats\",\"function\":{\"name\":\"get_blog_stats\",\"arguments\":\"{}\"}}]}}]}\n\ndata: [DONE]\n\n";
+    let (url, server) = serve(vec![
+        MockResponse::sse(vec![tool_frame]),
+        MockResponse::sse(vec![tool_frame]),
+    ]);
+    let mut send_options = options(url, |_| {});
+    send_options.max_tool_rounds = 1;
+    let result = chat::send_chat_message(
+        db.conn(),
+        &data_dir,
+        &project_id,
+        false,
+        &conversation.id,
+        "Loop forever",
+        send_options,
+    );
+    assert!(result.is_err());
+    server.join().unwrap();
+
+    let messages = chat::list_messages(db.conn(), &conversation.id).unwrap();
+    assert_eq!(messages.len(), 3);
+    assert_eq!(messages[1].role, ChatRole::Assistant);
+    assert_eq!(messages[2].role, ChatRole::Tool);
+    assert_eq!(messages[2].tool_call_id.as_deref(), Some("stats"));
+    assert!(messages[1].tool_calls.as_deref().unwrap().contains("stats"));
+}
+
+#[test]
+fn cancellation_before_mutating_tool_execution_records_pairs_without_mutation() {
+    let (_root, db, project_id, data_dir) = setup();
+    bds_core::db::fts::ensure_fts_tables(db.conn()).unwrap();
+    let post = bds_core::engine::post::create_post(
+        db.conn(),
+        &data_dir,
+        &project_id,
+        "Original",
+        Some("Body"),
+        Vec::new(),
+        Vec::new(),
+        None,
+        Some("en"),
+        None,
+    )
+    .unwrap();
+    let conversation = chat::create_conversation(db.conn(), Some("tool-model")).unwrap();
+    let tool_frame = format!(
+        "data: {{\"choices\":[{{\"delta\":{{\"tool_calls\":[{{\"index\":0,\"id\":\"update-1\",\"function\":{{\"name\":\"update_post_metadata\",\"arguments\":\"{{\\\"post_id\\\":\\\"{}\\\",\\\"title\\\":\\\"Changed\\\"}}\"}}}},{{\"index\":1,\"id\":\"stats-2\",\"function\":{{\"name\":\"get_blog_stats\",\"arguments\":\"{{}}\"}}}}]}}}}]}}\n\ndata: [DONE]\n\n",
+        post.id
+    );
+    let (url, server) = serve(vec![MockResponse::sse(vec![tool_frame.as_str()])]);
+    let cancel_id = conversation.id.clone();
+    let result = chat::send_chat_message(
+        db.conn(),
+        &data_dir,
+        &project_id,
+        false,
+        &conversation.id,
+        "Change it",
+        options(url, move |event| {
+            if matches!(event, chat::ChatEvent::ToolStarted { .. }) {
+                chat::cancel_chat(&cancel_id);
+            }
+        }),
+    )
+    .unwrap();
+    server.join().unwrap();
+
+    assert!(result.cancelled);
+    assert_eq!(
+        bds_core::db::queries::post::get_post_by_id(db.conn(), &post.id)
+            .unwrap()
+            .title,
+        "Original"
+    );
+    let messages = chat::list_messages(db.conn(), &conversation.id).unwrap();
+    assert_eq!(messages.len(), 4);
+    assert_eq!(messages[2].tool_call_id.as_deref(), Some("update-1"));
+    assert_eq!(messages[3].tool_call_id.as_deref(), Some("stats-2"));
+    assert!(
+        messages[2]
+            .content
+            .as_deref()
+            .unwrap()
+            .contains("cancelled")
+    );
+}
+
+fn options(
+    url: String,
+    handler: impl Fn(chat::ChatEvent) + Send + Sync + 'static,
+) -> chat::ChatSendOptions {
+    chat::ChatSendOptions {
+        endpoint: Some(AiEndpointConfig {
+            kind: AiEndpointKind::Online,
+            url,
+            model: "plain-model".to_string(),
+            api_key: Some("test-key".to_string()),
+        }),
+        event_handler: Some(Arc::new(handler)),
+        ..Default::default()
+    }
+}
+
+struct MockResponse {
+    status: u16,
+    content_type: &'static str,
+    chunks: Vec<String>,
+    delay: bool,
+}
+
+impl MockResponse {
+    fn sse(chunks: Vec<&str>) -> Self {
+        Self {
+            status: 200,
+            content_type: "text/event-stream",
+            chunks: chunks.into_iter().map(str::to_string).collect(),
+            delay: false,
+        }
+    }
+
+    fn delayed_sse(chunks: Vec<&str>) -> Self {
+        Self {
+            status: 200,
+            content_type: "text/event-stream",
+            chunks: chunks.into_iter().map(str::to_string).collect(),
+            delay: true,
+        }
+    }
+
+    fn status(status: u16, content_type: &'static str, body: &str) -> Self {
+        Self {
+            status,
+            content_type,
+            chunks: vec![body.to_string()],
+            delay: false,
+        }
+    }
+}
+
+fn serve(responses: Vec<MockResponse>) -> (String, thread::JoinHandle<()>) {
+    let listener = TcpListener::bind("127.0.0.1:0").unwrap();
+    let address = listener.local_addr().unwrap();
+    let server = thread::spawn(move || {
+        for response in responses {
+            let (mut socket, _) = listener.accept().unwrap();
+            read_request(&mut socket);
+            let reason = if response.status == 200 {
+                "OK"
+            } else {
+                "Error"
+            };
+            write!(
+                socket,
+                "HTTP/1.1 {} {}\r\nContent-Type: {}\r\nConnection: close\r\n\r\n",
+                response.status, reason, response.content_type
+            )
+            .unwrap();
+            for chunk in response.chunks {
+                if socket.write_all(chunk.as_bytes()).is_err() || socket.flush().is_err() {
+                    break;
+                }
+                if response.delay {
+                    thread::sleep(Duration::from_millis(60));
+                }
+            }
+        }
+    });
+    (format!("http://{address}"), server)
+}
+
+fn read_request(socket: &mut std::net::TcpStream) {
+    socket
+        .set_read_timeout(Some(Duration::from_secs(2)))
+        .unwrap();
+    let mut received = Vec::new();
+    let mut chunk = [0_u8; 2048];
+    loop {
+        let count = socket.read(&mut chunk).unwrap();
+        received.extend_from_slice(&chunk[..count]);
+        let Some(headers_end) = received.windows(4).position(|value| value == b"\r\n\r\n") else {
+            continue;
+        };
+        let headers = String::from_utf8_lossy(&received[..headers_end]);
+        let content_length = headers
+            .lines()
+            .find_map(|line| {
+                line.to_ascii_lowercase()
+                    .strip_prefix("content-length:")
+                    .map(str::trim)
+                    .map(str::to_string)
+            })
+            .and_then(|value| value.parse::<usize>().ok())
+            .unwrap_or(0);
+        if received.len() >= headers_end + 4 + content_length {
+            break;
+        }
+    }
+}

crates/bds-ui/Cargo.toml

@@ -11,6 +11,7 @@ iced = { workspace = true }
 muda = { workspace = true }
 rfd = { workspace = true }
 serde_json = { workspace = true }
+regex = { workspace = true }
 dirs = { workspace = true }
 chrono = { workspace = true }
 open = { workspace = true }

crates/bds-ui/src/app.rs

@@ -13,8 +13,9 @@ use bds_core::engine::ai::{self, AiEndpointConfig, AiEndpointKind};
 use bds_core::engine::task::{TaskId, TaskManager, TaskStatus};
 use bds_core::i18n::{UiLocale, detect_os_locale, normalize_language};
 use bds_core::model::{
-    DomainEntity, DomainEvent, ImportDefinition, ImportReport, Media, NotificationAction, Post,
-    PostStatus, PostTranslation, Project, PublishingPreferences, Script, SshMode, Template,
+    ChatConversation, DomainEntity, DomainEvent, ImportDefinition, ImportReport, Media,
+    NotificationAction, Post, PostStatus, PostTranslation, Project, PublishingPreferences, Script,
+    SshMode, Template,
 };
 
 use crate::components::webview::{self, WebViewConfig, WebViewController};
@@ -27,6 +28,7 @@ use crate::state::sidebar_filter::{CalendarMonth, CalendarYear, MediaFilter, Pos
 use crate::state::tabs::{self, Tab, TabType};
 use crate::state::toast::{Toast, ToastLevel};
 use crate::views::{
+    chat_view::{ChatEditorState, ChatModelChoice},
     dashboard::{
         DashboardCategory, DashboardRecentPost, DashboardState, DashboardStats, DashboardTag,
         DashboardTimelineMonth,
@@ -322,6 +324,21 @@ pub enum Message {
     CreateTemplate,
     CreateImport,
 
+    // Conversational AI
+    ChatCreate,
+    ChatRenameInputChanged(String),
+    ChatRename,
+    ChatDelete(String),
+    ChatModelChanged(String),
+    ChatInputAction(iced::widget::text_editor::Action),
+    ChatSend,
+    ChatCancel,
+    ChatLinkClicked(String),
+    ChatFinished {
+        conversation_id: String,
+        result: Result<engine::chat::ChatTurnResult, String>,
+    },
+
     Noop,
     InitMenuBar,
 }
@@ -812,6 +829,7 @@ pub struct BdsApp {
     sidebar_scripts: Vec<Script>,
     sidebar_templates: Vec<Template>,
     sidebar_imports: Vec<ImportDefinition>,
+    chat_conversations: Vec<ChatConversation>,
     sidebar_media_thumbs: HashMap<String, Option<std::path::PathBuf>>,
     sidebar_posts_has_more: bool,
     sidebar_media_has_more: bool,
@@ -838,6 +856,7 @@ pub struct BdsApp {
     // Tasks
     task_manager: Arc<TaskManager>,
     domain_events: engine::domain_events::EventSubscription,
+    chat_events: std::sync::mpsc::Receiver<engine::chat::ChatEvent>,
     script_menu_actions: Arc<Mutex<Vec<MenuAction>>>,
     task_snapshots: Vec<TaskSnapshot>,
     collapsed_task_groups: HashSet<String>,
@@ -883,6 +902,7 @@ pub struct BdsApp {
     template_editors: HashMap<String, TemplateEditorState>,
     script_editors: HashMap<String, ScriptEditorState>,
     import_editors: HashMap<String, ImportEditorState>,
+    chat_editors: HashMap<String, ChatEditorState>,
     tags_view_state: Option<TagsViewState>,
     settings_state: Option<SettingsViewState>,
     dashboard_state: Option<DashboardState>,
@@ -980,6 +1000,10 @@ impl BdsApp {
         registry.set_enabled(MenuAction::Find, false);
         registry.set_enabled(MenuAction::Replace, false);
         registry.set_enabled(MenuAction::OpenInBrowser, false);
+        let chat_conversations = db
+            .as_ref()
+            .and_then(|db| engine::chat::list_conversations(db.conn()).ok())
+            .unwrap_or_default();
 
         (
             Self {
@@ -995,6 +1019,7 @@ impl BdsApp {
                 sidebar_scripts: Vec::new(),
                 sidebar_templates: Vec::new(),
                 sidebar_imports: Vec::new(),
+                chat_conversations,
                 sidebar_media_thumbs: HashMap::new(),
                 sidebar_posts_has_more: false,
                 sidebar_media_has_more: false,
@@ -1011,6 +1036,7 @@ impl BdsApp {
                 panel_tab: PanelTab::Tasks,
                 task_manager: Arc::new(TaskManager::default()),
                 domain_events: engine::domain_events::subscribe(),
+                chat_events: engine::chat::subscribe_events(),
                 script_menu_actions: Arc::new(Mutex::new(Vec::new())),
                 task_snapshots: Vec::new(),
                 collapsed_task_groups: HashSet::new(),
@@ -1040,6 +1066,7 @@ impl BdsApp {
                 template_editors: HashMap::new(),
                 script_editors: HashMap::new(),
                 import_editors: HashMap::new(),
+                chat_editors: HashMap::new(),
                 tags_view_state: None,
                 settings_state: None,
                 dashboard_state: None,
@@ -1057,6 +1084,7 @@ impl BdsApp {
 
     #[cfg(test)]
     fn new_for_tests(db: Database, project: Project, data_dir: PathBuf) -> Self {
+        let chat_conversations = engine::chat::list_conversations(db.conn()).unwrap_or_default();
         Self {
             db: Some(db),
             db_path: data_dir.join("bds.db"),
@@ -1070,6 +1098,7 @@ impl BdsApp {
             sidebar_scripts: Vec::new(),
             sidebar_templates: Vec::new(),
             sidebar_imports: Vec::new(),
+            chat_conversations,
             sidebar_media_thumbs: HashMap::new(),
             sidebar_posts_has_more: false,
             sidebar_media_has_more: false,
@@ -1086,6 +1115,7 @@ impl BdsApp {
             panel_tab: PanelTab::Tasks,
             task_manager: Arc::new(TaskManager::default()),
             domain_events: engine::domain_events::subscribe(),
+            chat_events: engine::chat::subscribe_events(),
             script_menu_actions: Arc::new(Mutex::new(Vec::new())),
             task_snapshots: Vec::new(),
             collapsed_task_groups: HashSet::new(),
@@ -1114,6 +1144,7 @@ impl BdsApp {
             template_editors: HashMap::new(),
             script_editors: HashMap::new(),
             import_editors: HashMap::new(),
+            chat_editors: HashMap::new(),
             tags_view_state: None,
             settings_state: None,
             dashboard_state: None,
@@ -1151,6 +1182,9 @@ impl BdsApp {
                     self.refresh_sidebar_posts()
                 } else if new_view == SidebarView::Git && new_visible {
                     self.refresh_git()
+                } else if new_view == SidebarView::Chat && new_visible {
+                    self.refresh_chat_conversations();
+                    Task::none()
                 } else {
                     Task::none()
                 }
@@ -1172,6 +1206,144 @@ impl BdsApp {
             Message::CreateScript => self.create_sidebar_script(),
             Message::CreateTemplate => self.create_sidebar_template(),
             Message::CreateImport => self.create_sidebar_import(),
+            Message::ChatCreate => self.create_chat_conversation(),
+            Message::ChatRenameInputChanged(value) => {
+                if let Some(state) = self.active_chat_state_mut() {
+                    state.rename_input = value;
+                }
+                Task::none()
+            }
+            Message::ChatRename => {
+                let Some(id) = self.active_chat_id().map(str::to_string) else {
+                    return Task::none();
+                };
+                let Some(title) = self
+                    .chat_editors
+                    .get(&id)
+                    .map(|state| state.rename_input.clone())
+                else {
+                    return Task::none();
+                };
+                let result = self
+                    .db
+                    .as_ref()
+                    .ok_or_else(|| "database unavailable".to_string())
+                    .and_then(|db| {
+                        engine::chat::rename_conversation(db.conn(), &id, &title)
+                            .map_err(|error| error.to_string())
+                    });
+                match result {
+                    Ok(conversation) => {
+                        if let Some(state) = self.chat_editors.get_mut(&id) {
+                            state.conversation = conversation.clone();
+                            state.rename_input = conversation.title.clone();
+                        }
+                        if let Some(tab) = self.tabs.iter_mut().find(|tab| tab.id == id) {
+                            tab.title = conversation.title.clone();
+                        }
+                        self.refresh_chat_conversations();
+                    }
+                    Err(error) => self.notify(ToastLevel::Error, &error),
+                }
+                Task::none()
+            }
+            Message::ChatDelete(id) => {
+                let result = self
+                    .db
+                    .as_ref()
+                    .ok_or_else(|| "database unavailable".to_string())
+                    .and_then(|db| {
+                        engine::chat::delete_conversation(db.conn(), &id)
+                            .map_err(|error| error.to_string())
+                    });
+                match result {
+                    Ok(()) => {
+                        self.chat_editors.remove(&id);
+                        if let Some(next) = tabs::close_tab(&mut self.tabs, &id) {
+                            self.active_tab = self.tabs.get(next).map(|tab| tab.id.clone());
+                        } else {
+                            self.active_tab = None;
+                        }
+                        self.refresh_chat_conversations();
+                        self.notify(ToastLevel::Success, &t(self.ui_locale, "chat.deleted"));
+                    }
+                    Err(error) => self.notify(ToastLevel::Error, &error),
+                }
+                Task::none()
+            }
+            Message::ChatModelChanged(model) => {
+                let Some(id) = self.active_chat_id().map(str::to_string) else {
+                    return Task::none();
+                };
+                let result = self
+                    .db
+                    .as_ref()
+                    .ok_or_else(|| "database unavailable".to_string())
+                    .and_then(|db| {
+                        engine::chat::set_conversation_model(db.conn(), &id, &model)
+                            .map_err(|error| error.to_string())
+                    });
+                match result {
+                    Ok(()) => {
+                        if let Some(state) = self.chat_editors.get_mut(&id) {
+                            state.conversation.model = Some(model);
+                        }
+                        self.refresh_chat_conversations();
+                    }
+                    Err(error) => self.notify(ToastLevel::Error, &error),
+                }
+                Task::none()
+            }
+            Message::ChatInputAction(action) => {
+                if let Some(state) = self.active_chat_state_mut() {
+                    state.input.perform(action);
+                }
+                Task::none()
+            }
+            Message::ChatSend => self.send_active_chat_message(),
+            Message::ChatCancel => {
+                if let Some(id) = self.active_chat_id() {
+                    engine::chat::cancel_chat(id);
+                }
+                Task::none()
+            }
+            Message::ChatLinkClicked(url) => {
+                if url.starts_with("https://") || url.starts_with("http://") {
+                    if let Err(error) = open::that_detached(&url) {
+                        self.notify(ToastLevel::Error, &error.to_string());
+                    }
+                } else {
+                    self.notify(ToastLevel::Error, &t(self.ui_locale, "chat.link.refused"));
+                }
+                Task::none()
+            }
+            Message::ChatFinished {
+                conversation_id,
+                result,
+            } => {
+                if let Some(state) = self.chat_editors.get_mut(&conversation_id) {
+                    state.streaming = false;
+                    state.clear_streaming();
+                    state.active_tool = None;
+                    match result {
+                        Ok(_) => state.error = None,
+                        Err(error) => state.error = Some(error),
+                    }
+                    if let Some(db) = &self.db {
+                        state.set_messages(
+                            engine::chat::list_messages(db.conn(), &conversation_id)
+                                .unwrap_or_default(),
+                        );
+                        if let Ok(conversation) =
+                            engine::chat::get_conversation(db.conn(), &conversation_id)
+                        {
+                            state.conversation = conversation;
+                        }
+                    }
+                }
+                self.refresh_chat_conversations();
+                self.refresh_counts()
+            }
             Message::OpenSettingsSection(section) => {
                 self.sidebar_view = SidebarView::Settings;
                 self.sidebar_visible = true;
@@ -1838,6 +2010,7 @@ impl BdsApp {
             Message::TaskTick => {
                 self.task_manager.evict_expired();
                 self.refresh_task_snapshots();
+                self.process_chat_events();
                 if !self.search_index_rebuild_running {
                     self.auto_save_due_post_editors();
                 }
@@ -2385,6 +2558,7 @@ impl BdsApp {
             &self.sidebar_scripts,
             &self.sidebar_templates,
             &self.sidebar_imports,
+            &self.chat_conversations,
             active_post_filter,
             &self.media_filter,
             &self.sidebar_media_thumbs,
@@ -2409,6 +2583,7 @@ impl BdsApp {
             &self.template_editors,
             &self.script_editors,
             &self.import_editors,
+            &self.chat_editors,
             self.tags_view_state.as_ref(),
             self.settings_state.as_ref(),
             self.dashboard_state.as_ref(),
@@ -2458,6 +2633,324 @@ impl BdsApp {
 
     // ── Private helpers ──
 
+    fn active_chat_id(&self) -> Option<&str> {
+        let id = self.active_tab.as_deref()?;
+        self.tabs
+            .iter()
+            .any(|tab| tab.id == id && tab.tab_type == TabType::Chat)
+            .then_some(id)
+    }
+
+    fn active_chat_state_mut(&mut self) -> Option<&mut ChatEditorState> {
+        let id = self.active_chat_id()?.to_string();
+        self.chat_editors.get_mut(&id)
+    }
+
+    fn refresh_chat_conversations(&mut self) {
+        self.chat_conversations = self
+            .db
+            .as_ref()
+            .and_then(|db| engine::chat::list_conversations(db.conn()).ok())
+            .unwrap_or_default();
+    }
+
+    fn chat_model_options(&self) -> Vec<ChatModelChoice> {
+        let mut models = self
+            .db
+            .as_ref()
+            .and_then(|db| engine::chat::list_models(db.conn()).ok())
+            .into_iter()
+            .flatten()
+            .map(|model| {
+                let context = model.context_window.div_ceil(1_000).to_string();
+                let output = model.max_output_tokens.div_ceil(1_000).to_string();
+                let capability = t(
+                    self.ui_locale,
+                    if model.supports_tools {
+                        "chat.model.tools"
+                    } else {
+                        "chat.model.textOnly"
+                    },
+                );
+                ChatModelChoice {
+                    id: model.id,
+                    label: tw(
+                        self.ui_locale,
+                        "chat.model.option",
+                        &[
+                            ("provider", &model.provider),
+                            ("name", &model.name),
+                            ("context", &context),
+                            ("output", &output),
+                            ("capability", &capability),
+                        ],
+                    ),
+                }
+            })
+            .collect::<Vec<_>>();
+        if let Some(db) = &self.db
+            && let Ok(settings) = ai::load_ai_settings(db.conn(), self.offline_mode)
+        {
+            if let Some(model) = settings.default_model
+                && !models.iter().any(|choice| choice.id == model)
+            {
+                models.push(ChatModelChoice {
+                    id: model.clone(),
+                    label: model,
+                });
+            }
+            let endpoint_model = if self.offline_mode {
+                settings.airplane_endpoint.model
+            } else {
+                settings.online_endpoint.model
+            };
+            if !endpoint_model.trim().is_empty()
+                && !models.iter().any(|choice| choice.id == endpoint_model)
+            {
+                models.push(ChatModelChoice {
+                    id: endpoint_model.clone(),
+                    label: endpoint_model,
+                });
+            }
+        }
+        models.sort_by(|left, right| left.label.cmp(&right.label));
+        models.dedup_by(|left, right| left.id == right.id);
+        models
+    }
+
+    fn create_chat_conversation(&mut self) -> Task<Message> {
+        let model = self
+            .chat_model_options()
+            .into_iter()
+            .next()
+            .map(|choice| choice.id);
+        let title = model.as_deref().map_or_else(
+            || t(self.ui_locale, "chat.new"),
+            |model| tw(self.ui_locale, "chat.newWithModel", &[("model", model)]),
+        );
+        let result = self
+            .db
+            .as_ref()
+            .ok_or_else(|| "database unavailable".to_string())
+            .and_then(|db| {
+                engine::chat::create_conversation_titled(db.conn(), model.as_deref(), &title)
+                    .map_err(|error| error.to_string())
+            });
+        match result {
+            Ok(conversation) => {
+                self.refresh_chat_conversations();
+                Task::done(Message::OpenTab(Tab {
+                    id: conversation.id,
+                    tab_type: TabType::Chat,
+                    title: conversation.title,
+                    is_transient: false,
+                    is_dirty: false,
+                }))
+            }
+            Err(error) => {
+                self.notify(ToastLevel::Error, &error);
+                Task::none()
+            }
+        }
+    }
+
+    fn send_active_chat_message(&mut self) -> Task<Message> {
+        let Some(conversation_id) = self.active_chat_id().map(str::to_string) else {
+            return Task::none();
+        };
+        let Some(project_id) = self
+            .active_project
+            .as_ref()
+            .map(|project| project.id.clone())
+        else {
+            return Task::none();
+        };
+        let Some(data_dir) = self.data_dir.clone() else {
+            return Task::none();
+        };
+        let Some(state) = self.chat_editors.get_mut(&conversation_id) else {
+            return Task::none();
+        };
+        if state.streaming {
+            return Task::none();
+        }
+        let content = state.input.text().trim().to_string();
+        if content.is_empty() {
+            return Task::none();
+        }
+        state.input = iced::widget::text_editor::Content::new();
+        state.streaming = true;
+        state.clear_streaming();
+        state.active_tool = None;
+        state.error = None;
+        let db_path = self.db_path.clone();
+        let offline_mode = self.offline_mode;
+        let result_id = conversation_id.clone();
+        Task::perform(
+            async move {
+                tokio::task::spawn_blocking(move || {
+                    let db = Database::open(&db_path).map_err(|error| error.to_string())?;
+                    engine::chat::send_chat_message(
+                        db.conn(),
+                        &data_dir,
+                        &project_id,
+                        offline_mode,
+                        &conversation_id,
+                        &content,
+                        engine::chat::ChatSendOptions::default(),
+                    )
+                    .map_err(|error| error.to_string())
+                })
+                .await
+                .map_err(|error| error.to_string())?
+            },
+            move |result| Message::ChatFinished {
+                conversation_id: result_id.clone(),
+                result,
+            },
+        )
+    }
+
+    fn process_chat_events(&mut self) {
+        let events = self.chat_events.try_iter().collect::<Vec<_>>();
+        for event in events {
+            match event {
+                engine::chat::ChatEvent::Content {
+                    conversation_id,
+                    content,
+                } => {
+                    if let Some(state) = self.chat_editors.get_mut(&conversation_id) {
+                        state.set_streaming_content(content);
+                    }
+                }
+                engine::chat::ChatEvent::ToolStarted {
+                    conversation_id,
+                    name,
+                } => {
+                    if let Some(state) = self.chat_editors.get_mut(&conversation_id) {
+                        state.active_tool = Some(name);
+                    }
+                }
+                engine::chat::ChatEvent::ToolFinished {
+                    conversation_id, ..
+                } => {
+                    if let Some(state) = self.chat_editors.get_mut(&conversation_id) {
+                        state.active_tool = None;
+                    }
+                }
+                engine::chat::ChatEvent::Failed {
+                    conversation_id,
+                    message,
+                } => {
+                    if let Some(state) = self.chat_editors.get_mut(&conversation_id) {
+                        state.error = Some(message);
+                    }
+                }
+                engine::chat::ChatEvent::Navigate {
+                    destination,
+                    entity_id,
+                } => self.dispatch_chat_navigation(&destination, entity_id.as_deref()),
+                engine::chat::ChatEvent::Started { .. }
+                | engine::chat::ChatEvent::Finished { .. }
+                | engine::chat::ChatEvent::Cancelled { .. } => {}
+            }
+        }
+    }
+
+    fn dispatch_chat_navigation(&mut self, destination: &str, entity_id: Option<&str>) {
+        match destination {
+            "toggle_sidebar" => {
+                self.sidebar_visible = !self.sidebar_visible;
+                return;
+            }
+            "toggle_panel" => {
+                self.panel_visible = !self.panel_visible;
+                return;
+            }
+            "toggle_assistant_sidebar" => {
+                if self.sidebar_view == SidebarView::Chat {
+                    self.sidebar_visible = !self.sidebar_visible;
+                } else {
+                    self.sidebar_view = SidebarView::Chat;
+                    self.sidebar_visible = true;
+                }
+                return;
+            }
+            _ => {}
+        }
+
+        self.sidebar_view = match destination {
+            "posts" => SidebarView::Posts,
+            "pages" => SidebarView::Pages,
+            "media" => SidebarView::Media,
+            "templates" => SidebarView::Templates,
+            "scripts" => SidebarView::Scripts,
+            "tags" => SidebarView::Tags,
+            "chat" => SidebarView::Chat,
+            "import" => SidebarView::Import,
+            "git" => SidebarView::Git,
+            "settings" => SidebarView::Settings,
+            _ => return,
+        };
+        self.sidebar_visible = true;
+        if destination == "settings" && entity_id.is_none() {
+            self.open_singleton_tab(TabType::Settings, "common.settings");
+            if self.settings_state.is_none() {
+                self.settings_state = Some(self.hydrate_settings_state());
+            }
+            return;
+        }
+        if destination == "tags" && entity_id.is_none() {
+            self.open_singleton_tab(TabType::Tags, "tabBar.tags");
+            return;
+        }
+        let Some(id) = entity_id else { return };
+        let tab = self.db.as_ref().and_then(|db| match destination {
+            "posts" => bds_core::db::queries::post::get_post_by_id(db.conn(), id)
+                .ok()
+                .map(|item| (TabType::Post, item.title)),
+            "media" => bds_core::db::queries::media::get_media_by_id(db.conn(), id)
+                .ok()
+                .map(|item| {
+                    (
+                        TabType::Media,
+                        item.title.unwrap_or_else(|| item.original_name.clone()),
+                    )
+                }),
+            "templates" => bds_core::db::queries::template::get_template_by_id(db.conn(), id)
+                .ok()
+                .map(|item| (TabType::Templates, item.title)),
+            "scripts" => bds_core::db::queries::script::get_script_by_id(db.conn(), id)
+                .ok()
+                .map(|item| (TabType::Scripts, item.title)),
+            "chat" => engine::chat::get_conversation(db.conn(), id)
+                .ok()
+                .map(|item| (TabType::Chat, item.title)),
+            _ => None,
+        });
+        let Some((tab_type, title)) = tab else {
+            self.notify(
+                ToastLevel::Error,
+                &t(self.ui_locale, "chat.navigation.invalid"),
+            );
+            return;
+        };
+        let index = tabs::open_tab(
+            &mut self.tabs,
+            Tab {
+                id: id.to_string(),
+                tab_type,
+                title,
+                is_transient: false,
+                is_dirty: false,
+            },
+        );
+        if let Some(tab) = self.tabs.get(index).cloned() {
+            self.active_tab = Some(tab.id.clone());
+            self.load_editor_for_tab(&tab);
+        }
+    }
+
     fn apply_ui_locale(&mut self, locale: UiLocale) {
         self.ui_locale = locale;
         self.locale_dropdown_open = false;
@@ -6398,6 +6891,28 @@ impl BdsApp {
                     }
                 }
             }
+            TabType::Chat => {
+                if !self.chat_editors.contains_key(&tab.id) {
+                    if self.settings_state.is_none() {
+                        self.settings_state = Some(self.hydrate_settings_state());
+                    }
+                    match (
+                        engine::chat::get_conversation(db.conn(), &tab.id),
+                        engine::chat::list_messages(db.conn(), &tab.id),
+                    ) {
+                        (Ok(conversation), Ok(messages)) => {
+                            let models = self.chat_model_options();
+                            self.chat_editors.insert(
+                                tab.id.clone(),
+                                ChatEditorState::new(conversation, messages, models),
+                            );
+                        }
+                        (Err(error), _) | (_, Err(error)) => {
+                            self.notify(ToastLevel::Error, &error.to_string());
+                        }
+                    }
+                }
+            }
             TabType::Tags => {
                 if self.tags_view_state.is_none() {
                     let project_id = self
@@ -9169,4 +9684,45 @@ mod tests {
                 .is_empty()
         );
     }
+
+    #[test]
+    fn chat_ui_creates_reopens_renames_and_deletes_persistent_conversations() {
+        let (db, project, tmp) = setup();
+        let mut app = make_app(db, project, &tmp);
+
+        let _ = app.update(Message::ChatCreate);
+        assert_eq!(app.chat_conversations.len(), 1);
+        let conversation = app.chat_conversations[0].clone();
+        let tab = Tab {
+            id: conversation.id.clone(),
+            tab_type: TabType::Chat,
+            title: conversation.title,
+            is_transient: false,
+            is_dirty: false,
+        };
+        let _ = app.update(Message::OpenTab(tab));
+        assert!(app.chat_editors.contains_key(&conversation.id));
+
+        let _ = app.update(Message::ChatRenameInputChanged("Research".to_string()));
+        let _ = app.update(Message::ChatRename);
+        assert_eq!(app.chat_conversations[0].title, "Research");
+        assert_eq!(
+            bds_core::engine::chat::get_conversation(
+                app.db.as_ref().unwrap().conn(),
+                &conversation.id,
+            )
+            .unwrap()
+            .title,
+            "Research"
+        );
+
+        let _ = app.update(Message::ChatDelete(conversation.id.clone()));
+        assert!(app.chat_conversations.is_empty());
+        assert!(!app.chat_editors.contains_key(&conversation.id));
+        assert!(
+            bds_core::engine::chat::list_conversations(app.db.as_ref().unwrap().conn())
+                .unwrap()
+                .is_empty()
+        );
+    }
 }

crates/bds-ui/src/views/chat_view.rs

@@ -0,0 +1,429 @@
+use bds_core::i18n::UiLocale;
+use bds_core::model::{ChatConversation, ChatMessage, ChatRole};
+use iced::widget::text::Shaping;
+use iced::widget::{
+    Space, button, column, container, markdown, row, scrollable, text, text_editor, text_input,
+};
+use iced::{Alignment, Color, Element, Length};
+
+use crate::app::Message;
+use crate::components::inputs;
+use crate::i18n::{t, tw};
+
+pub struct ChatEditorState {
+    pub conversation: ChatConversation,
+    pub messages: Vec<ChatMessage>,
+    rendered_messages: std::collections::HashMap<i32, Vec<markdown::Item>>,
+    pub input: text_editor::Content,
+    pub rename_input: String,
+    pub model_options: Vec<ChatModelChoice>,
+    pub streaming: bool,
+    pub streaming_content: String,
+    streaming_markdown: Vec<markdown::Item>,
+    pub active_tool: Option<String>,
+    pub error: Option<String>,
+}
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub struct ChatModelChoice {
+    pub id: String,
+    pub label: String,
+}
+
+impl std::fmt::Display for ChatModelChoice {
+    fn fmt(&self, formatter: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        formatter.write_str(&self.label)
+    }
+}
+
+impl ChatEditorState {
+    pub fn new(
+        conversation: ChatConversation,
+        messages: Vec<ChatMessage>,
+        mut model_options: Vec<ChatModelChoice>,
+    ) -> Self {
+        if let Some(model) = conversation.model.as_ref()
+            && !model_options.iter().any(|choice| choice.id == *model)
+        {
+            model_options.push(ChatModelChoice {
+                id: model.clone(),
+                label: model.clone(),
+            });
+        }
+        model_options.sort_by(|left, right| left.label.cmp(&right.label));
+        model_options.dedup_by(|left, right| left.id == right.id);
+        let rendered_messages = messages
+            .iter()
+            .filter(|message| message.role == ChatRole::Assistant)
+            .map(|message| {
+                (
+                    message.id,
+                    parse_safe_markdown(message.content.as_deref().unwrap_or_default()),
+                )
+            })
+            .collect();
+        Self {
+            rename_input: conversation.title.clone(),
+            conversation,
+            messages,
+            rendered_messages,
+            input: text_editor::Content::new(),
+            model_options,
+            streaming: false,
+            streaming_content: String::new(),
+            streaming_markdown: Vec::new(),
+            active_tool: None,
+            error: None,
+        }
+    }
+
+    pub fn set_messages(&mut self, messages: Vec<ChatMessage>) {
+        self.rendered_messages = messages
+            .iter()
+            .filter(|message| message.role == ChatRole::Assistant)
+            .map(|message| {
+                (
+                    message.id,
+                    parse_safe_markdown(message.content.as_deref().unwrap_or_default()),
+                )
+            })
+            .collect();
+        self.messages = messages;
+    }
+
+    pub fn set_streaming_content(&mut self, content: String) {
+        self.streaming_markdown = parse_safe_markdown(&content);
+        self.streaming_content = content;
+    }
+
+    pub fn clear_streaming(&mut self) {
+        self.streaming_content.clear();
+        self.streaming_markdown.clear();
+    }
+
+    pub fn token_totals(&self) -> (u64, u64, u64, u64) {
+        self.messages
+            .iter()
+            .fold((0, 0, 0, 0), |mut total, message| {
+                total.0 += message.token_usage_input.unwrap_or(0).max(0) as u64;
+                total.1 += message.token_usage_output.unwrap_or(0).max(0) as u64;
+                total.2 += message.cache_read_tokens.unwrap_or(0).max(0) as u64;
+                total.3 += message.cache_write_tokens.unwrap_or(0).max(0) as u64;
+                total
+            })
+    }
+}
+
+pub fn view<'a>(
+    state: &'a ChatEditorState,
+    locale: UiLocale,
+    ai_available: bool,
+) -> Element<'a, Message> {
+    if !ai_available {
+        return container(inputs::card(
+            column![
+                text(t(locale, "chat.unavailable.title")).size(20),
+                text(t(locale, "chat.unavailable.guidance"))
+                    .size(13)
+                    .color(inputs::SECTION_COLOR),
+                button(text(t(locale, "chat.unavailable.openSettings")))
+                    .on_press(Message::OpenSettingsSection(
+                        crate::views::settings_view::SettingsSection::AI,
+                    ))
+                    .style(inputs::primary_button),
+            ]
+            .spacing(12),
+        ))
+        .padding(16)
+        .width(Length::Fill)
+        .height(Length::Fill)
+        .into();
+    }
+
+    let selected_model = state.conversation.model.as_ref().and_then(|selected| {
+        state
+            .model_options
+            .iter()
+            .find(|model| model.id == *selected)
+    });
+    let model_control: Element<'a, Message> = if state.model_options.is_empty() {
+        text(t(locale, "chat.model.none"))
+            .size(12)
+            .color(inputs::SECTION_COLOR)
+            .into()
+    } else {
+        inputs::labeled_select(
+            &t(locale, "chat.model.label"),
+            &state.model_options,
+            selected_model,
+            |choice| Message::ChatModelChanged(choice.id),
+        )
+    };
+    let header = inputs::card(
+        column![
+            row![
+                text_input(&t(locale, "chat.rename.placeholder"), &state.rename_input)
+                    .on_input(Message::ChatRenameInputChanged)
+                    .on_submit(Message::ChatRename)
+                    .size(18)
+                    .padding([7, 9])
+                    .style(inputs::field_style),
+                button(text(t(locale, "chat.rename.action")))
+                    .on_press(Message::ChatRename)
+                    .padding([8, 12])
+                    .style(inputs::secondary_button),
+                button(text(t(locale, "common.delete")))
+                    .on_press(Message::ChatDelete(state.conversation.id.clone()))
+                    .padding([8, 12])
+                    .style(inputs::danger_button),
+            ]
+            .spacing(8)
+            .align_y(Alignment::Center),
+            model_control,
+        ]
+        .spacing(10),
+    );
+
+    let mut message_elements: Vec<Element<'a, Message>> = Vec::new();
+    if state.messages.is_empty() {
+        message_elements.push(welcome(locale));
+    } else {
+        for message in &state.messages {
+            if message.role == ChatRole::Tool {
+                continue;
+            }
+            message_elements.push(message_view(
+                message,
+                state.rendered_messages.get(&message.id),
+                locale,
+            ));
+        }
+    }
+    if state.streaming && !state.streaming_content.is_empty() {
+        message_elements.push(assistant_card(
+            &state.streaming_markdown,
+            t(locale, "chat.streaming"),
+        ));
+    }
+    if let Some(tool) = state.active_tool.as_deref() {
+        message_elements.push(
+            inputs::card(
+                row![
+                    text("⚙").size(13),
+                    text(tw(locale, "chat.tool.running", &[("name", tool)]))
+                        .size(12)
+                        .color(inputs::SECTION_COLOR),
+                ]
+                .spacing(8),
+            )
+            .into(),
+        );
+    }
+    if let Some(error) = state.error.as_deref() {
+        message_elements.push(
+            text(error.to_string())
+                .size(12)
+                .color(Color::from_rgb8(0xE0, 0x6C, 0x75))
+                .into(),
+        );
+    }
+    let transcript = scrollable(
+        iced::widget::Column::with_children(message_elements)
+            .spacing(10)
+            .width(Length::Fill),
+    )
+    .anchor_bottom()
+    .height(Length::Fill);
+
+    let send_label = if state.streaming {
+        t(locale, "chat.stop")
+    } else {
+        t(locale, "chat.send")
+    };
+    let mut send_button = button(text(send_label))
+        .padding([8, 16])
+        .style(if state.streaming {
+            inputs::danger_button
+        } else {
+            inputs::primary_button
+        });
+    if state.streaming {
+        send_button = send_button.on_press(Message::ChatCancel);
+    } else if !state.input.text().trim().is_empty() {
+        send_button = send_button.on_press(Message::ChatSend);
+    }
+    let input_height =
+        (state.input.text().lines().count().max(1) as f32 * 22.0 + 28.0).clamp(72.0, 200.0);
+    let input_placeholder = t(locale, "chat.input.placeholder");
+    let composer = inputs::card(
+        column![
+            text_editor(&state.input)
+                .placeholder(input_placeholder)
+                .on_action(Message::ChatInputAction)
+                .key_binding(|key_press| {
+                    if matches!(
+                        key_press.key,
+                        iced::keyboard::Key::Named(iced::keyboard::key::Named::Enter)
+                    ) && !key_press.modifiers.shift()
+                    {
+                        Some(iced::widget::text_editor::Binding::Custom(
+                            Message::ChatSend,
+                        ))
+                    } else {
+                        iced::widget::text_editor::Binding::from_key_press(key_press)
+                    }
+                })
+                .height(Length::Fixed(input_height))
+                .style(inputs::text_editor_style),
+            row![
+                text(t(locale, "chat.input.hint"))
+                    .size(11)
+                    .color(inputs::SECTION_COLOR),
+                Space::with_width(Length::Fill),
+                send_button,
+            ]
+            .align_y(Alignment::Center),
+        ]
+        .spacing(8),
+    );
+
+    column![header, transcript, composer]
+        .spacing(12)
+        .padding(16)
+        .width(Length::Fill)
+        .height(Length::Fill)
+        .into()
+}
+
+fn welcome(locale: UiLocale) -> Element<'static, Message> {
+    let mut items = vec![
+        text(t(locale, "chat.welcome.title")).size(20).into(),
+        text(t(locale, "chat.welcome.subtitle"))
+            .size(13)
+            .color(inputs::SECTION_COLOR)
+            .into(),
+    ];
+    for index in 1..=5 {
+        items.push(
+            text(format!(
+                "• {}",
+                t(locale, &format!("chat.welcome.tip{index}"))
+            ))
+            .size(13)
+            .into(),
+        );
+    }
+    inputs::card(iced::widget::Column::with_children(items).spacing(7)).into()
+}
+
+fn message_view<'a>(
+    message: &'a ChatMessage,
+    rendered_markdown: Option<&'a Vec<markdown::Item>>,
+    locale: UiLocale,
+) -> Element<'a, Message> {
+    let label = match message.role {
+        ChatRole::User => t(locale, "chat.role.user"),
+        ChatRole::Assistant => t(locale, "chat.role.assistant"),
+        ChatRole::System => t(locale, "chat.role.system"),
+        ChatRole::Tool => t(locale, "chat.role.tool"),
+    };
+    let content = message.content.as_deref().unwrap_or_default();
+    let body: Element<'a, Message> = if let Some(items) = rendered_markdown {
+        markdown::view(
+            items,
+            markdown::Settings::default(),
+            markdown::Style::from_palette(crate::components::inputs::app_theme().palette()),
+        )
+        .map(|url| Message::ChatLinkClicked(url.to_string()))
+    } else {
+        text(content.to_string())
+            .size(14)
+            .shaping(Shaping::Advanced)
+            .into()
+    };
+    let mut children: Vec<Element<'a, Message>> = vec![
+        text(label).size(11).color(inputs::SECTION_COLOR).into(),
+        body,
+    ];
+    if let Some(tool_calls) = message.tool_calls.as_deref()
+        && let Ok(calls) = serde_json::from_str::<Vec<serde_json::Value>>(tool_calls)
+    {
+        for call in calls {
+            let raw_name = call
+                .get("function")
+                .and_then(|function| function.get("name"))
+                .and_then(serde_json::Value::as_str)
+                .map(str::to_string)
+                .unwrap_or_else(|| t(locale, "chat.role.tool"));
+            let name = raw_name.chars().take(30).collect::<String>();
+            let arguments = call
+                .get("function")
+                .and_then(|function| function.get("arguments"))
+                .and_then(serde_json::Value::as_str)
+                .unwrap_or_default();
+            let args_preview = arguments.chars().take(30).collect::<String>();
+            let marker = if args_preview.is_empty() {
+                format!("✓ {}", tw(locale, "chat.tool.used", &[("name", &name)]))
+            } else {
+                format!(
+                    "✓ {} · {}",
+                    tw(locale, "chat.tool.used", &[("name", &name)]),
+                    args_preview
+                )
+            };
+            children.push(text(marker).size(11).color(inputs::SECTION_COLOR).into());
+        }
+    }
+    inputs::card(iced::widget::Column::with_children(children).spacing(6)).into()
+}
+
+fn assistant_card<'a>(items: &'a [markdown::Item], label: String) -> Element<'a, Message> {
+    let body = markdown::view(
+        items,
+        markdown::Settings::default(),
+        markdown::Style::from_palette(crate::components::inputs::app_theme().palette()),
+    )
+    .map(|url| Message::ChatLinkClicked(url.to_string()));
+    inputs::card(column![text(label).size(11).color(inputs::SECTION_COLOR), body,].spacing(6))
+        .into()
+}
+
+fn parse_safe_markdown(markdown_source: &str) -> Vec<markdown::Item> {
+    let safe = external_images_as_links(markdown_source);
+    markdown::parse(&safe).collect()
+}
+
+fn external_images_as_links(markdown_source: &str) -> String {
+    static EXTERNAL_IMAGE: std::sync::OnceLock<regex::Regex> = std::sync::OnceLock::new();
+    let pattern = EXTERNAL_IMAGE.get_or_init(|| {
+        regex::Regex::new(r"!\[([^\]]*)\]\((https?://[^)\s]+)\)")
+            .expect("external image Markdown regex")
+    });
+    pattern
+        .replace_all(markdown_source, "[🖼 $1]($2)")
+        .into_owned()
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn markdown_never_embeds_external_images_or_raw_html() {
+        let rendered = parse_safe_markdown(
+            "# Hello\n![secret](https://example.com/a.png)<script>unsafe</script>",
+        );
+        let debug = format!("{rendered:?}");
+        assert!(debug.contains("Hello"));
+        assert!(debug.contains("secret"));
+        assert!(!debug.contains("script"));
+        assert!(debug.contains("unsafe"));
+    }
+
+    #[test]
+    fn external_images_become_safe_links_before_gfm_rendering() {
+        let safe = external_images_as_links("![diagram](https://example.com/a.png)");
+        assert_eq!(safe, "[🖼 diagram](https://example.com/a.png)");
+        assert_eq!(parse_safe_markdown(&safe).len(), 1);
+    }
+}

crates/bds-ui/src/views/mod.rs

@@ -1,4 +1,5 @@
 pub mod activity_bar;
+pub mod chat_view;
 pub mod dashboard;
 pub mod git;
 pub mod import_editor;

crates/bds-ui/src/views/sidebar.rs

@@ -5,7 +5,7 @@ use iced::widget::{Space, button, column, container, image, row, scrollable, tex
 use iced::{Background, Border, Color, Element, Length, Theme};
 
 use bds_core::i18n::UiLocale;
-use bds_core::model::{ImportDefinition, Media, Post, Script, Template};
+use bds_core::model::{ChatConversation, ImportDefinition, Media, Post, Script, Template};
 
 use crate::app::Message;
 use crate::components::inputs;
@@ -78,7 +78,7 @@ fn placeholder_key(view: SidebarView) -> &'static str {
         SidebarView::Scripts => "sidebar.noScriptsYet",
         SidebarView::Templates => "sidebar.noTemplatesYet",
         SidebarView::Tags => "sidebar.tagsHeader",
-        SidebarView::Chat => "sidebar.chatPlaceholder",
+        SidebarView::Chat => "chat.sidebar.empty",
         SidebarView::Import => "sidebar.importPlaceholder",
         SidebarView::Git => "git.noChanges",
         SidebarView::Settings => "sidebar.settingsHeader",
@@ -628,6 +628,7 @@ pub fn view(
     scripts: &[Script],
     templates: &[Template],
     imports: &[ImportDefinition],
+    conversations: &[ChatConversation],
     post_filter: &PostFilter,
     media_filter: &MediaFilter,
     media_thumbs: &std::collections::HashMap<String, Option<PathBuf>>,
@@ -655,6 +656,7 @@ pub fn view(
         SidebarView::Scripts => Some(Message::CreateScript),
         SidebarView::Templates => Some(Message::CreateTemplate),
         SidebarView::Import => Some(Message::CreateImport),
+        SidebarView::Chat => Some(Message::ChatCreate),
         _ => None,
     };
 
@@ -1132,6 +1134,54 @@ pub fn view(
                 iced::widget::Column::with_children(items).spacing(1).into()
             }
         }
+        SidebarView::Chat => {
+            if conversations.is_empty() {
+                text(t(locale, "chat.sidebar.empty"))
+                    .size(12)
+                    .shaping(Shaping::Advanced)
+                    .color(muted)
+                    .into()
+            } else {
+                let items = conversations
+                    .iter()
+                    .map(|conversation| {
+                        let style = if active_tab == Some(conversation.id.as_str()) {
+                            item_active_style
+                        } else {
+                            item_style
+                        };
+                        let model = conversation
+                            .model
+                            .clone()
+                            .unwrap_or_else(|| t(locale, "chat.model.none"));
+                        button(
+                            container(
+                                column![
+                                    text(conversation.title.clone())
+                                        .size(12)
+                                        .shaping(Shaping::Advanced),
+                                    text(model).size(10).shaping(Shaping::Advanced).color(muted),
+                                ]
+                                .spacing(1),
+                            )
+                            .width(Length::Fill),
+                        )
+                        .on_press(Message::OpenTab(Tab {
+                            id: conversation.id.clone(),
+                            tab_type: TabType::Chat,
+                            title: conversation.title.clone(),
+                            is_transient: false,
+                            is_dirty: false,
+                        }))
+                        .padding([5, 8])
+                        .width(Length::Fill)
+                        .style(style)
+                        .into()
+                    })
+                    .collect::<Vec<Element<'static, Message>>>();
+                iced::widget::Column::with_children(items).spacing(1).into()
+            }
+        }
         SidebarView::Settings => {
             // Per sidebar_views.allium SettingsNav: 9 fixed-order sections
             use crate::views::settings_view::SettingsSection;
@@ -1197,11 +1247,6 @@ pub fn view(
             iced::widget::Column::with_children(items).spacing(1).into()
         }
         SidebarView::Git => crate::views::git::sidebar_view(git_state, offline_mode, locale),
-        _ => text(t(locale, placeholder_key(sidebar_view)))
-            .size(12)
-            .shaping(Shaping::Advanced)
-            .color(muted)
-            .into(),
     };
 
     let content = column![header_row, Space::with_height(8.0), body,]

crates/bds-ui/src/views/status_bar.rs

@@ -123,6 +123,7 @@ pub fn view(
     task_snapshots: &[TaskSnapshot],
     theme_badge: &str,
     active_post_status: Option<&str>,
+    chat_tokens: Option<(u64, u64, u64, u64)>,
 ) -> Element<'static, Message> {
     let label_color = Color::from_rgb(0.60, 0.60, 0.65);
 
@@ -194,6 +195,28 @@ pub fn view(
         "statusBar.media",
         &[("count", &media_count.to_string())],
     );
+    let chat_token_label = chat_tokens.map(|(input, output, cache_read, cache_write)| {
+        tw(
+            locale,
+            "statusBar.chatTokens",
+            &[
+                ("input", &input.to_string()),
+                ("output", &output.to_string()),
+                ("cacheRead", &cache_read.to_string()),
+                ("cacheWrite", &cache_write.to_string()),
+            ],
+        )
+    });
+    let chat_tokens_el: Element<'static, Message> = chat_token_label.map_or_else(
+        || Space::with_width(0).into(),
+        |label| {
+            text(label)
+                .size(11)
+                .shaping(Shaping::Advanced)
+                .color(label_color)
+                .into()
+        },
+    );
 
     // Airplane mode toggle — ✈ icon
     let airplane_btn = button(text("\u{2708}").size(13).shaping(Shaping::Advanced))
@@ -225,6 +248,7 @@ pub fn view(
             .size(11)
             .shaping(Shaping::Advanced)
             .color(label_color),
+        chat_tokens_el,
         text(theme_badge.to_string())
             .size(11)
             .shaping(Shaping::Advanced)

crates/bds-ui/src/views/workspace.rs

@@ -7,7 +7,7 @@ use iced::{Alignment, Background, Color, Element, Length, Padding, Theme};
 
 use bds_core::engine::git::GitCommit;
 use bds_core::i18n::UiLocale;
-use bds_core::model::{ImportDefinition, Media, Post, Project, Script, Template};
+use bds_core::model::{ChatConversation, ImportDefinition, Media, Post, Project, Script, Template};
 
 use crate::app::Message;
 use crate::state::navigation::{OutputEntry, PanelTab, SidebarView, TaskSnapshot};
@@ -16,6 +16,7 @@ use crate::state::tabs::{Tab, TabType};
 use crate::state::toast::Toast;
 use crate::views::{
     activity_bar,
+    chat_view::{self, ChatEditorState},
     dashboard::DashboardState,
     git::{self, GitDiffState, GitUiState},
     media_editor::{self, MediaEditorState},
@@ -88,6 +89,7 @@ pub fn view<'a>(
     sidebar_scripts: &'a [Script],
     sidebar_templates: &'a [Template],
     sidebar_imports: &'a [ImportDefinition],
+    chat_conversations: &'a [ChatConversation],
     // Sidebar filters
     post_filter: &'a PostFilter,
     media_filter: &'a MediaFilter,
@@ -121,6 +123,7 @@ pub fn view<'a>(
     template_editors: &'a HashMap<String, TemplateEditorState>,
     script_editors: &'a HashMap<String, ScriptEditorState>,
     import_editors: &'a HashMap<String, crate::views::import_editor::ImportEditorState>,
+    chat_editors: &'a HashMap<String, ChatEditorState>,
     tags_view_state: Option<&'a TagsViewState>,
     settings_state: Option<&'a SettingsViewState>,
     dashboard_state: Option<&'a DashboardState>,
@@ -150,6 +153,7 @@ pub fn view<'a>(
         template_editors,
         script_editors,
         import_editors,
+        chat_editors,
         tags_view_state,
         settings_state,
         dashboard_state,
@@ -204,6 +208,7 @@ pub fn view<'a>(
             sidebar_scripts,
             sidebar_templates,
             sidebar_imports,
+            chat_conversations,
             post_filter,
             media_filter,
             sidebar_media_thumbs,
@@ -262,6 +267,9 @@ pub fn view<'a>(
         task_snapshots,
         theme_badge,
         active_post_status.as_deref(),
+        active_tab
+            .and_then(|id| chat_editors.get(id))
+            .map(ChatEditorState::token_totals),
     );
 
     let base_layout: Element<'a, Message> = column![main_row, separator_h(), status]
@@ -387,6 +395,7 @@ fn route_content_area<'a>(
     template_editors: &'a HashMap<String, TemplateEditorState>,
     script_editors: &'a HashMap<String, ScriptEditorState>,
     import_editors: &'a HashMap<String, crate::views::import_editor::ImportEditorState>,
+    chat_editors: &'a HashMap<String, ChatEditorState>,
     tags_view_state: Option<&'a TagsViewState>,
     settings_state: Option<&'a SettingsViewState>,
     dashboard_state: Option<&'a DashboardState>,
@@ -458,6 +467,13 @@ fn route_content_area<'a>(
                 loading_view(locale)
             }
         }
+        ContentRoute::Chat(tab_id) => {
+            if let Some(state) = chat_editors.get(tab_id) {
+                chat_view::view(state, locale, is_ai_enabled(settings_state, offline_mode))
+            } else {
+                loading_view(locale)
+            }
+        }
         ContentRoute::Tags => {
             if let Some(state) = tags_view_state {
                 tags_view::view(state, locale)
@@ -504,6 +520,7 @@ enum ContentRoute<'a> {
     Templates(&'a str),
     Scripts(&'a str),
     Import(&'a str),
+    Chat(&'a str),
     Tags,
     Settings,
     SiteValidation,
@@ -577,6 +594,7 @@ fn route_kind<'a>(
                 ContentRoute::Loading
             }
         }
+        TabType::Chat => ContentRoute::Chat(tab_id),
         TabType::Tags => {
             if tags_view_state.is_some() {
                 ContentRoute::Tags
@@ -595,7 +613,6 @@ fn route_kind<'a>(
         TabType::MetadataDiff => ContentRoute::MetadataDiff,
         TabType::GitDiff => ContentRoute::GitDiff(tab_id),
         TabType::Style
-        | TabType::Chat
         | TabType::MenuEditor
         | TabType::Documentation
         | TabType::ApiDocumentation
@@ -658,7 +675,6 @@ mod tests {
         let site_validation_state = SiteValidationState::default();
         let unsupported = [
             TabType::Style,
-            TabType::Chat,
             TabType::MenuEditor,
             TabType::Documentation,
             TabType::ApiDocumentation,
@@ -712,6 +728,31 @@ mod tests {
         assert!(matches!(route, ContentRoute::GitDiff("git-diff:file.txt")));
     }
 
+    #[test]
+    fn chat_tab_routes_to_real_chat_view() {
+        let empty_posts = HashMap::new();
+        let empty_media = HashMap::new();
+        let empty_templates = HashMap::new();
+        let empty_scripts = HashMap::new();
+        let empty_imports = HashMap::new();
+        let site_validation_state = SiteValidationState::default();
+        let tabs = vec![tab("conversation", TabType::Chat, "Chat")];
+        let route = route_kind(
+            &tabs,
+            Some("conversation"),
+            &empty_posts,
+            &empty_media,
+            &empty_templates,
+            &empty_scripts,
+            &empty_imports,
+            None,
+            None,
+            None,
+            &site_validation_state,
+        );
+        assert!(matches!(route, ContentRoute::Chat("conversation")));
+    }
+
     #[test]
     fn validation_tabs_route_to_real_views() {
         let empty_posts = HashMap::new();

locales/ui/de.ftl

@@ -43,6 +43,42 @@ activity-sourceControl = Versionskontrolle
 common-save = Speichern
 common-open = Öffnen
 common-cancel = Abbrechen
+common-delete = Löschen
+chat-sidebar-empty = Noch keine Unterhaltungen
+chat-new = Neue Unterhaltung
+chat-newWithModel = Unterhaltung mit { $model }
+chat-unavailable-title = Die dialogbasierte KI ist nicht verfügbar
+chat-unavailable-guidance = Konfiguriere den aktiven KI-Endpunkt und das Modell in den Einstellungen. Im Flugmodus wird nur der lokale Endpunkt verwendet.
+chat-unavailable-openSettings = KI-Einstellungen öffnen
+chat-model-none = Kein Modell ausgewählt
+chat-model-label = Modell
+chat-model-option = { $provider } — { $name } · { $context }k Kontext · { $output }k Ausgabe · { $capability }
+chat-model-tools = Werkzeuge
+chat-model-textOnly = nur Text
+chat-rename-placeholder = Titel der Unterhaltung
+chat-rename-action = Umbenennen
+chat-streaming = Assistent · antwortet…
+chat-tool-running = { $name } wird ausgeführt…
+chat-tool-used = { $name } verwendet
+chat-stop = Stoppen
+chat-send = Senden
+chat-input-placeholder = Frage etwas über deinen Blog…
+chat-input-hint = Eingabetaste sendet · Umschalt+Eingabe fügt eine Zeile ein
+chat-welcome-title = Wie kann ich bei deinem Blog helfen?
+chat-welcome-subtitle = Ich kann Projektinhalte prüfen und Blog-Werkzeuge nutzen, wenn das gewählte Modell sie unterstützt.
+chat-welcome-tip1 = Den aktuellen Blog zusammenfassen
+chat-welcome-tip2 = Beiträge zu einem Thema finden
+chat-welcome-tip3 = Tags und Kategorien prüfen
+chat-welcome-tip4 = Medien, Vorlagen oder Skripte untersuchen
+chat-welcome-tip5 = Metadaten von Beiträgen oder Medien aktualisieren
+chat-role-user = Du
+chat-role-assistant = Assistent
+chat-role-system = System
+chat-role-tool = Werkzeug
+chat-deleted = Unterhaltung gelöscht
+chat-link-refused = Dieser Linktyp ist nicht erlaubt
+chat-navigation-invalid = Das angeforderte Blog-Element konnte nicht geöffnet werden
+statusBar-chatTokens = KI ↑{ $input } ↓{ $output } Cache { $cacheRead }/{ $cacheWrite }
 common-settings = Einstellungen
 common-tasks = Aufgaben
 common-running = laufend
@@ -120,7 +156,6 @@ sidebar-noPagesYet = Noch keine Seiten
 sidebar-noMediaYet = Noch keine Medien
 sidebar-noScriptsYet = Noch keine Skripte
 sidebar-noTemplatesYet = Noch keine Vorlagen
-sidebar-chatPlaceholder = KI-Assistent erscheint hier
 sidebar-importPlaceholder = Inhalte aus externen Quellen importieren
 sidebar-loading = Lädt...
 sidebar-settingsHeader = Einstellungen

locales/ui/en.ftl

@@ -43,6 +43,42 @@ activity-sourceControl = Source Control
 common-save = Save
 common-open = Open
 common-cancel = Cancel
+common-delete = Delete
+chat-sidebar-empty = No conversations yet
+chat-new = New Chat
+chat-newWithModel = Chat with { $model }
+chat-unavailable-title = Conversational AI is unavailable
+chat-unavailable-guidance = Configure the active AI endpoint and model in Settings. Airplane mode uses only the local endpoint.
+chat-unavailable-openSettings = Open AI Settings
+chat-model-none = No model selected
+chat-model-label = Model
+chat-model-option = { $provider } — { $name } · { $context }k context · { $output }k output · { $capability }
+chat-model-tools = tools
+chat-model-textOnly = text only
+chat-rename-placeholder = Conversation title
+chat-rename-action = Rename
+chat-streaming = Assistant · responding…
+chat-tool-running = Running { $name }…
+chat-tool-used = Used { $name }
+chat-stop = Stop
+chat-send = Send
+chat-input-placeholder = Ask about your blog…
+chat-input-hint = Enter sends · Shift+Enter adds a line
+chat-welcome-title = How can I help with your blog?
+chat-welcome-subtitle = I can inspect project content and use blog tools when the selected model supports them.
+chat-welcome-tip1 = Summarize the current blog
+chat-welcome-tip2 = Find posts about a topic
+chat-welcome-tip3 = Review tags and categories
+chat-welcome-tip4 = Inspect media, templates, or scripts
+chat-welcome-tip5 = Update post or media metadata
+chat-role-user = You
+chat-role-assistant = Assistant
+chat-role-system = System
+chat-role-tool = Tool
+chat-deleted = Conversation deleted
+chat-link-refused = This link type is not allowed
+chat-navigation-invalid = The requested blog item could not be opened
+statusBar-chatTokens = AI ↑{ $input } ↓{ $output } cache { $cacheRead }/{ $cacheWrite }
 common-settings = Settings
 common-tasks = Tasks
 common-running = running
@@ -120,7 +156,6 @@ sidebar-noPagesYet = No pages yet
 sidebar-noMediaYet = No media yet
 sidebar-noScriptsYet = No scripts yet
 sidebar-noTemplatesYet = No templates yet
-sidebar-chatPlaceholder = AI assistant will appear here
 sidebar-importPlaceholder = Import content from external sources
 sidebar-loading = Loading...
 sidebar-settingsHeader = Settings

locales/ui/es.ftl

@@ -43,6 +43,42 @@ activity-sourceControl = Control de código fuente
 common-save = Guardar
 common-open = Abrir
 common-cancel = Cancelar
+common-delete = Eliminar
+chat-sidebar-empty = No hay conversaciones
+chat-new = Nueva conversación
+chat-newWithModel = Conversación con { $model }
+chat-unavailable-title = La IA conversacional no está disponible
+chat-unavailable-guidance = Configura el punto de acceso de IA activo y el modelo en Ajustes. El modo avión usa únicamente el punto de acceso local.
+chat-unavailable-openSettings = Abrir ajustes de IA
+chat-model-none = Ningún modelo seleccionado
+chat-model-label = Modelo
+chat-model-option = { $provider } — { $name } · contexto { $context }k · salida { $output }k · { $capability }
+chat-model-tools = herramientas
+chat-model-textOnly = solo texto
+chat-rename-placeholder = Título de la conversación
+chat-rename-action = Cambiar nombre
+chat-streaming = Asistente · respondiendo…
+chat-tool-running = Ejecutando { $name }…
+chat-tool-used = Se usó { $name }
+chat-stop = Detener
+chat-send = Enviar
+chat-input-placeholder = Pregunta sobre tu blog…
+chat-input-hint = Intro envía · Mayús+Intro añade una línea
+chat-welcome-title = ¿Cómo puedo ayudarte con tu blog?
+chat-welcome-subtitle = Puedo examinar el proyecto y usar las herramientas del blog si el modelo las admite.
+chat-welcome-tip1 = Resume el blog actual
+chat-welcome-tip2 = Busca entradas sobre un tema
+chat-welcome-tip3 = Revisa etiquetas y categorías
+chat-welcome-tip4 = Examina medios, plantillas o scripts
+chat-welcome-tip5 = Actualiza metadatos de entradas o medios
+chat-role-user = Tú
+chat-role-assistant = Asistente
+chat-role-system = Sistema
+chat-role-tool = Herramienta
+chat-deleted = Conversación eliminada
+chat-link-refused = Este tipo de enlace no está permitido
+chat-navigation-invalid = No se pudo abrir el elemento del blog solicitado
+statusBar-chatTokens = IA ↑{ $input } ↓{ $output } caché { $cacheRead }/{ $cacheWrite }
 common-settings = Configuración
 common-tasks = Tareas
 common-running = en ejecución
@@ -120,7 +156,6 @@ sidebar-noPagesYet = Aún no hay páginas
 sidebar-noMediaYet = Aún no hay medios
 sidebar-noScriptsYet = Aún no hay scripts
 sidebar-noTemplatesYet = Aún no hay plantillas
-sidebar-chatPlaceholder = El asistente IA aparecerá aquí
 sidebar-importPlaceholder = Importar contenido desde fuentes externas
 sidebar-loading = Cargando...
 sidebar-settingsHeader = Configuración

locales/ui/fr.ftl

@@ -43,6 +43,42 @@ activity-sourceControl = Contrôle de source
 common-save = Enregistrer
 common-open = Ouvrir
 common-cancel = Annuler
+common-delete = Supprimer
+chat-sidebar-empty = Aucune conversation
+chat-new = Nouvelle conversation
+chat-newWithModel = Conversation avec { $model }
+chat-unavailable-title = L’IA conversationnelle est indisponible
+chat-unavailable-guidance = Configurez le point d’accès IA actif et le modèle dans les réglages. Le mode avion utilise uniquement le point d’accès local.
+chat-unavailable-openSettings = Ouvrir les réglages IA
+chat-model-none = Aucun modèle sélectionné
+chat-model-label = Modèle
+chat-model-option = { $provider } — { $name } · contexte { $context }k · sortie { $output }k · { $capability }
+chat-model-tools = outils
+chat-model-textOnly = texte uniquement
+chat-rename-placeholder = Titre de la conversation
+chat-rename-action = Renommer
+chat-streaming = Assistant · réponse en cours…
+chat-tool-running = Exécution de { $name }…
+chat-tool-used = { $name } utilisé
+chat-stop = Arrêter
+chat-send = Envoyer
+chat-input-placeholder = Posez une question sur votre blog…
+chat-input-hint = Entrée envoie · Maj+Entrée ajoute une ligne
+chat-welcome-title = Comment puis-je aider votre blog ?
+chat-welcome-subtitle = Je peux examiner le contenu du projet et utiliser les outils du blog si le modèle les prend en charge.
+chat-welcome-tip1 = Résumer le blog actuel
+chat-welcome-tip2 = Rechercher des articles sur un sujet
+chat-welcome-tip3 = Examiner les étiquettes et catégories
+chat-welcome-tip4 = Examiner médias, modèles ou scripts
+chat-welcome-tip5 = Modifier les métadonnées d’un article ou média
+chat-role-user = Vous
+chat-role-assistant = Assistant
+chat-role-system = Système
+chat-role-tool = Outil
+chat-deleted = Conversation supprimée
+chat-link-refused = Ce type de lien n’est pas autorisé
+chat-navigation-invalid = L’élément du blog demandé n’a pas pu être ouvert
+statusBar-chatTokens = IA ↑{ $input } ↓{ $output } cache { $cacheRead }/{ $cacheWrite }
 common-settings = Paramètres
 common-tasks = Tâches
 common-running = en cours
@@ -120,7 +156,6 @@ sidebar-noPagesYet = Aucune page pour le moment
 sidebar-noMediaYet = Aucun média pour le moment
 sidebar-noScriptsYet = Aucun script
 sidebar-noTemplatesYet = Aucun modèle
-sidebar-chatPlaceholder = L'assistant IA apparaîtra ici
 sidebar-importPlaceholder = Importer du contenu depuis des sources externes
 sidebar-loading = Chargement...
 sidebar-settingsHeader = Paramètres

locales/ui/it.ftl

@@ -43,6 +43,42 @@ activity-sourceControl = Controllo sorgente
 common-save = Salva
 common-open = Apri
 common-cancel = Annulla
+common-delete = Elimina
+chat-sidebar-empty = Nessuna conversazione
+chat-new = Nuova conversazione
+chat-newWithModel = Conversazione con { $model }
+chat-unavailable-title = L’IA conversazionale non è disponibile
+chat-unavailable-guidance = Configura l’endpoint IA attivo e il modello nelle impostazioni. La modalità aereo usa solo l’endpoint locale.
+chat-unavailable-openSettings = Apri impostazioni IA
+chat-model-none = Nessun modello selezionato
+chat-model-label = Modello
+chat-model-option = { $provider } — { $name } · contesto { $context }k · uscita { $output }k · { $capability }
+chat-model-tools = strumenti
+chat-model-textOnly = solo testo
+chat-rename-placeholder = Titolo della conversazione
+chat-rename-action = Rinomina
+chat-streaming = Assistente · risposta in corso…
+chat-tool-running = Esecuzione di { $name }…
+chat-tool-used = Usato { $name }
+chat-stop = Interrompi
+chat-send = Invia
+chat-input-placeholder = Chiedi qualcosa sul tuo blog…
+chat-input-hint = Invio spedisce · Maiusc+Invio aggiunge una riga
+chat-welcome-title = Come posso aiutarti con il blog?
+chat-welcome-subtitle = Posso esaminare il progetto e usare gli strumenti del blog se il modello li supporta.
+chat-welcome-tip1 = Riassumi il blog attuale
+chat-welcome-tip2 = Trova articoli su un argomento
+chat-welcome-tip3 = Controlla tag e categorie
+chat-welcome-tip4 = Esamina media, modelli o script
+chat-welcome-tip5 = Aggiorna i metadati di articoli o media
+chat-role-user = Tu
+chat-role-assistant = Assistente
+chat-role-system = Sistema
+chat-role-tool = Strumento
+chat-deleted = Conversazione eliminata
+chat-link-refused = Questo tipo di collegamento non è consentito
+chat-navigation-invalid = Impossibile aprire l’elemento del blog richiesto
+statusBar-chatTokens = IA ↑{ $input } ↓{ $output } cache { $cacheRead }/{ $cacheWrite }
 common-settings = Impostazioni
 common-tasks = Attività
 common-running = in esecuzione
@@ -120,7 +156,6 @@ sidebar-noPagesYet = Nessuna pagina
 sidebar-noMediaYet = Nessun media
 sidebar-noScriptsYet = Nessuno script
 sidebar-noTemplatesYet = Nessun modello
-sidebar-chatPlaceholder = L'assistente IA apparirà qui
 sidebar-importPlaceholder = Importa contenuti da fonti esterne
 sidebar-loading = Caricamento...
 sidebar-settingsHeader = Impostazioni