Implement MCP automation and approvals.

crates/bds-mcp/src/main.rs

@@ -0,0 +1,45 @@
+use std::io::{BufRead as _, Write as _};
+use std::process::ExitCode;
+
+use bds_core::engine::mcp::{McpContext, handle_rpc};
+use serde_json::{Value, json};
+
+fn main() -> ExitCode {
+    if let Err(error) = run_stdio() {
+        eprintln!("MCP server error: {error}");
+        ExitCode::from(1)
+    } else {
+        ExitCode::SUCCESS
+    }
+}
+
+fn run_stdio() -> Result<(), Box<dyn std::error::Error>> {
+    let database_path = bds_core::util::application_database_path();
+    if let Some(parent) = database_path.parent() {
+        std::fs::create_dir_all(parent)?;
+    }
+    let context = McpContext::new(database_path);
+    context.prepare()?;
+    let stdin = std::io::stdin();
+    let mut stdout = std::io::stdout().lock();
+    for line in stdin.lock().lines() {
+        let line = line?;
+        if line.trim().is_empty() {
+            continue;
+        }
+        let response = match serde_json::from_str::<Value>(&line) {
+            Ok(request) => handle_rpc(&context, &request),
+            Err(_) => Some(json!({
+                "jsonrpc":"2.0",
+                "id":null,
+                "error":{"code":-32700,"message":"Parse error"}
+            })),
+        };
+        if let Some(response) = response {
+            serde_json::to_writer(&mut stdout, &response)?;
+            stdout.write_all(b"\n")?;
+            stdout.flush()?;
+        }
+    }
+    Ok(())
+}