feat: hooked scripts into the blogmark pipeline

DOCUMENTATION.md

@@ -205,11 +205,55 @@ Each script exposes an **Entrypoint** selector. bDS always provides a synthetic
 
 At this stage, scripting is intended for controlled project workflows where scripts interact with application-provided tools. Keep scripts versioned through your normal Git workflow, review changes carefully, and prefer small, explicit scripts over monolithic utility files.
 
+For transform scripts, bDS provides a built-in Python helper named `toast(message)`. It accepts a single string and emits a UI intent that the app handles on the renderer side. This keeps script ergonomics simple while preserving a controlled bridge between script runtime and user interface.
+
+When transform scripts fail during a pipeline run, bDS automatically surfaces an error toast so users are notified immediately. Detailed transform diagnostics (applied scripts and per-script errors) are also written to the Output panel.
+
+### Example transform script
+
+Use a transform function to modify incoming bookmark/blogmark content before bDS creates the post. The function receives a mutable `post` dictionary and should return that dictionary.
+
+```python
+def normalize_blogmark(post):
+	# 1) Manipulate title
+	title = (post.get("title") or "").strip()
+	if title and not title.startswith("[Clipped]"):
+		post["title"] = f"[Clipped] {title}"
+
+	# 2) Manipulate text/content
+	content = (post.get("content") or "").strip()
+	prefix = "Imported from blogmark\n\n"
+	if content and not content.startswith(prefix):
+		post["content"] = prefix + content
+
+	# 3) Set or replace categories
+	post["categories"] = ["Inbox", "Research"]
+
+	# 4) Add and normalize tags
+	tags = post.get("tags") or []
+	tags.append("blogmark")
+	tags.append("clipped")
+	post["tags"] = sorted({str(tag).strip().lower() for tag in tags if str(tag).strip()})
+
+	# 5) Optional user notification
+	toast(f"Transform applied: {post.get('title')}")
+	return post
+```
+
+Notes:
+- `title` and `content` are strings.
+- `categories` and `tags` are string lists (e.g., `['News', 'AI']`).
+- Return the mutated `post` dict from your transform function.
+- Keep transforms small and deterministic, especially when multiple active transforms run in sequence.
+
 ### Key takeaways
 
 - Scripting is available and intentionally evolving in small steps.
 - `main` is always available and preserves whole-script execution behavior.
 - Script files and metadata remain filesystem-friendly and Git-reviewable.
+- Transform scripts can call `toast("...")` to send user-facing UI notifications.
+- Transform scripts can directly manipulate `title`, `content`, `categories`, and `tags`.
+- Transform pipeline failures always trigger automatic error toasts.
 
 [↑ Back to In this article](#in-this-article)
 

src/main/engine/BlogmarkTransformService.ts

@@ -0,0 +1,307 @@
+import { z } from 'zod';
+import { getScriptEngine } from './ScriptEngine';
+
+const transformPostSchema = z.object({
+  title: z.string().trim().min(1),
+  content: z.string().trim().min(1),
+  tags: z.array(z.string().trim().min(1)),
+  categories: z.array(z.string().trim().min(1)),
+});
+
+export type BlogmarkTransformedPost = z.infer<typeof transformPostSchema>;
+
+export interface BlogmarkTransformInput {
+  post: BlogmarkTransformedPost;
+  context: {
+    source: 'blogmark';
+    url: string;
+  };
+}
+
+export interface BlogmarkTransformScriptRecord {
+  id: string;
+  slug: string;
+  title: string;
+  kind: 'macro' | 'utility' | 'transform';
+  entrypoint: string;
+  enabled: boolean;
+  content: string;
+  updatedAt: Date | string;
+}
+
+export interface BlogmarkTransformExecutor {
+  runTransform(script: BlogmarkTransformScriptRecord, input: BlogmarkTransformInput): Promise<unknown>;
+}
+
+export interface BlogmarkTransformScriptProvider {
+  getScripts(): Promise<BlogmarkTransformScriptRecord[]>;
+}
+
+export interface BlogmarkTransformError {
+  scriptId: string;
+  scriptSlug: string;
+  message: string;
+}
+
+export interface BlogmarkTransformExecutionData {
+  output: unknown;
+  toasts: string[];
+}
+
+export interface BlogmarkTransformResult {
+  post: BlogmarkTransformedPost;
+  appliedScriptIds: string[];
+  errors: BlogmarkTransformError[];
+  toasts: string[];
+}
+
+const MAX_TOASTS_PER_SCRIPT = 5;
+const MAX_TOASTS_TOTAL = 20;
+const MAX_TOAST_LENGTH = 300;
+
+const scriptEngineBackedProvider: BlogmarkTransformScriptProvider = {
+  async getScripts() {
+    return getScriptEngine().getAllScripts();
+  },
+};
+
+function toTimestamp(value: Date | string): number {
+  if (value instanceof Date) {
+    return value.getTime();
+  }
+
+  const parsed = Date.parse(value);
+  return Number.isFinite(parsed) ? parsed : 0;
+}
+
+function normalizePost(value: unknown): BlogmarkTransformedPost | null {
+  if (!value || typeof value !== 'object' || Array.isArray(value)) {
+    return null;
+  }
+
+  const valueRecord = value as Record<string, unknown>;
+  const maybePost = valueRecord.post;
+
+  const candidate = maybePost && typeof maybePost === 'object' && !Array.isArray(maybePost)
+    ? maybePost
+    : value;
+
+  const parsed = transformPostSchema.safeParse(candidate);
+  if (!parsed.success) {
+    return null;
+  }
+
+  return parsed.data;
+}
+
+function normalizeToastMessage(value: unknown): string | null {
+  if (value === undefined || value === null) {
+    return null;
+  }
+
+  const normalized = String(value).trim();
+  if (normalized.length === 0) {
+    return null;
+  }
+
+  return normalized.slice(0, MAX_TOAST_LENGTH);
+}
+
+function toExecutionData(value: unknown): BlogmarkTransformExecutionData {
+  if (value && typeof value === 'object' && !Array.isArray(value)) {
+    const valueRecord = value as Record<string, unknown>;
+    const toasts = Array.isArray(valueRecord.toasts)
+      ? valueRecord.toasts
+        .map((item) => normalizeToastMessage(item))
+        .filter((item): item is string => item !== null)
+      : [];
+
+    if (Object.prototype.hasOwnProperty.call(valueRecord, 'output')) {
+      return {
+        output: valueRecord.output,
+        toasts,
+      };
+    }
+
+    return {
+      output: value,
+      toasts,
+    };
+  }
+
+  return {
+    output: value,
+    toasts: [],
+  };
+}
+
+function toErrorMessage(error: unknown): string {
+  if (error instanceof Error && typeof error.message === 'string' && error.message.trim().length > 0) {
+    return error.message;
+  }
+  return String(error);
+}
+
+class PythonBlogmarkTransformExecutor implements BlogmarkTransformExecutor {
+  private runtimePromise: Promise<any> | null = null;
+
+  async runTransform(script: BlogmarkTransformScriptRecord, input: BlogmarkTransformInput): Promise<unknown> {
+    const runtime = await this.getRuntime();
+    const toastMessages: string[] = [];
+    const pushToast = (message: unknown): void => {
+      if (toastMessages.length >= MAX_TOASTS_PER_SCRIPT) {
+        return;
+      }
+
+      const normalizedMessage = normalizeToastMessage(message);
+      if (!normalizedMessage) {
+        return;
+      }
+
+      toastMessages.push(normalizedMessage);
+    };
+
+    runtime.globals.set('__bds_push_toast', pushToast);
+    await runtime.runPythonAsync(`
+def toast(message):
+    __bds_push_toast(str(message))
+`);
+
+    await runtime.runPythonAsync(script.content);
+
+    const requestedEntrypoint = this.resolveEntrypoint(script.entrypoint);
+    const payload = JSON.stringify(input);
+    runtime.globals.set('__bds_transform_payload_json', payload);
+    runtime.globals.set('__bds_transform_entrypoint', requestedEntrypoint);
+
+    const rawResult = await runtime.runPythonAsync(`
+import json
+_payload = json.loads(__bds_transform_payload_json)
+_entrypoint = __bds_transform_entrypoint
+_transform_fn = globals().get(_entrypoint)
+if _transform_fn is None or not callable(_transform_fn):
+    raise RuntimeError(f"Transform entrypoint '{_entrypoint}' is not callable")
+_result = _transform_fn(_payload)
+json.dumps(_result)
+`);
+
+    return {
+      output: JSON.parse(String(rawResult)),
+      toasts: toastMessages,
+    };
+  }
+
+  private resolveEntrypoint(value: string): string {
+    const nextEntrypoint = typeof value === 'string' ? value.trim() : '';
+    if (/^[A-Za-z_][A-Za-z0-9_]*$/.test(nextEntrypoint) && nextEntrypoint !== 'main') {
+      return nextEntrypoint;
+    }
+
+    return 'transform';
+  }
+
+  private async getRuntime(): Promise<any> {
+    if (!this.runtimePromise) {
+      this.runtimePromise = (async () => {
+        const pyodideModule = await import('pyodide');
+        return pyodideModule.loadPyodide();
+      })();
+    }
+
+    return this.runtimePromise;
+  }
+}
+
+export class BlogmarkTransformService {
+  constructor(
+    private readonly dependencies: {
+      provider?: BlogmarkTransformScriptProvider;
+      executor?: BlogmarkTransformExecutor;
+    } = {},
+  ) {}
+
+  async applyTransforms(input: BlogmarkTransformInput): Promise<BlogmarkTransformResult> {
+    const parsedInput = transformPostSchema.parse(input.post);
+    const transformInput: BlogmarkTransformInput = {
+      ...input,
+      post: parsedInput,
+    };
+
+    const provider = this.dependencies.provider ?? scriptEngineBackedProvider;
+    const executor = this.dependencies.executor ?? new PythonBlogmarkTransformExecutor();
+
+    const scripts = await provider.getScripts();
+    const activeTransforms = scripts
+      .filter((script) => script.enabled && script.kind === 'transform')
+      .sort((left, right) => {
+        const byUpdatedAt = toTimestamp(left.updatedAt) - toTimestamp(right.updatedAt);
+        if (byUpdatedAt !== 0) {
+          return byUpdatedAt;
+        }
+
+        const bySlug = left.slug.localeCompare(right.slug);
+        if (bySlug !== 0) {
+          return bySlug;
+        }
+
+        return left.id.localeCompare(right.id);
+      });
+
+    let currentPost = transformInput.post;
+    const appliedScriptIds: string[] = [];
+    const errors: BlogmarkTransformError[] = [];
+    const toasts: string[] = [];
+
+    for (const script of activeTransforms) {
+      try {
+        const execution = await executor.runTransform(script, {
+          ...transformInput,
+          post: currentPost,
+        });
+
+        const executionData = toExecutionData(execution);
+        const nextToasts = executionData.toasts
+          .map((message) => normalizeToastMessage(message))
+          .filter((message): message is string => message !== null);
+
+        if (nextToasts.length > 0 && toasts.length < MAX_TOASTS_TOTAL) {
+          const remaining = MAX_TOASTS_TOTAL - toasts.length;
+          toasts.push(...nextToasts.slice(0, remaining));
+        }
+
+        const normalizedPost = normalizePost(executionData.output);
+        if (!normalizedPost) {
+          throw new Error('Transform output validation failed');
+        }
+
+        currentPost = normalizedPost;
+        appliedScriptIds.push(script.id);
+      } catch (error) {
+        const message = toErrorMessage(error);
+        errors.push({
+          scriptId: script.id,
+          scriptSlug: script.slug,
+          message,
+        });
+        console.error(`[blogmark-transform] ${script.slug}: ${message}`);
+      }
+    }
+
+    return {
+      post: currentPost,
+      appliedScriptIds,
+      errors,
+      toasts,
+    };
+  }
+}
+
+let blogmarkTransformServiceInstance: BlogmarkTransformService | null = null;
+
+export function getBlogmarkTransformService(): BlogmarkTransformService {
+  if (!blogmarkTransformServiceInstance) {
+    blogmarkTransformServiceInstance = new BlogmarkTransformService();
+  }
+
+  return blogmarkTransformServiceInstance;
+}

src/main/main.ts

@@ -8,6 +8,7 @@ import { eq } from 'drizzle-orm';
 import { getMediaEngine } from './engine/MediaEngine';
 import { getPostEngine } from './engine/PostEngine';
 import { getMetaEngine } from './engine/MetaEngine';
+import { getBlogmarkTransformService } from './engine/BlogmarkTransformService';
 import { PreviewServer } from './engine/PreviewServer';
 import { APP_MENU_ACTION_EVENT_MAP, APP_MENU_GROUPS, APP_MENU_ITEM_IDS, type AppMenuAction, type AppMenuItemDefinition } from './shared/menuCommands';
 import { resolveUiLanguageFromSystemLocale, translateMenu } from './shared/i18n';
@@ -373,16 +374,40 @@ async function processBlogmarkDeepLink(rawDeepLink: string): Promise<void> {
   const metadata = await getMetaEngine().getProjectMetadata();
   const preferredCategory = normalizeBlogmarkCategory((metadata as { blogmarkCategory?: unknown } | null)?.blogmarkCategory);
 
-  const createdPost = await getPostEngine().createPost({
+  const transformService = getBlogmarkTransformService();
-    title: payload.title,
+  const transformResult = await transformService.applyTransforms({
-    content: buildBlogmarkMarkdownLink(payload.title, payload.url),
+    post: {
-    categories: preferredCategory ? [preferredCategory] : [],
+      title: payload.title,
+      content: buildBlogmarkMarkdownLink(payload.title, payload.url),
+      tags: [],
+      categories: preferredCategory ? [preferredCategory] : [],
+    },
+    context: {
+      source: 'blogmark',
+      url: payload.url,
+    },
   });
 
+  const createdPost = await getPostEngine().createPost({
+    title: transformResult.post.title,
+    content: transformResult.post.content,
+    tags: transformResult.post.tags,
+    categories: transformResult.post.categories,
+  });
+
+  const blogmarkCreatedPayload = {
+    post: createdPost,
+    transform: {
+      appliedScriptIds: transformResult.appliedScriptIds,
+      errors: transformResult.errors,
+      toasts: transformResult.toasts,
+    },
+  };
+
   if (mainWindow && !mainWindow.isDestroyed() && rendererReady) {
-    mainWindow.webContents.send('blogmark:created', createdPost);
+    mainWindow.webContents.send('blogmark:created', blogmarkCreatedPayload);
   } else {
-    pendingBlogmarkCreatedEvents.push(createdPost);
+    pendingBlogmarkCreatedEvents.push(blogmarkCreatedPayload);
   }
 }
 

src/renderer/App.tsx

@@ -6,6 +6,11 @@ import { openSingletonToolTab } from './navigation/tabPolicy';
 import { persistSiteValidationReport } from './navigation/siteValidationPersistence';
 import { executeActivityClick } from './navigation/activityExecution';
 import { handleBlogmarkCreatedEvent } from './navigation/blogmarkHandling';
+import {
+  buildBlogmarkTransformOutputEntries,
+  buildBlogmarkTransformToastNotifications,
+  parseBlogmarkCreatedEventPayload,
+} from './navigation/blogmarkTransformOutput';
 import { createDeferredEventGate } from './navigation/deferredEventGate';
 import { createAndFocusPost } from './navigation/postCreation';
 import { ensureRendererPicoThemeStylesheet, getRendererPicoTheme } from './utils/picoTheme';
@@ -34,6 +39,7 @@ const App: React.FC = () => {
     setPicoTheme,
     openTab,
     restoreTabState,
+    appendPanelOutputEntry,
   } = useAppStore();
   const blogmarkEventGateRef = useRef(createDeferredEventGate<PostData>());
 
@@ -239,12 +245,46 @@ const App: React.FC = () => {
     );
 
     unsubscribers.push(
-      window.electronAPI?.on('blogmark:created', (post: unknown) => {
+      window.electronAPI?.on('blogmark:created', (payload: unknown) => {
-        const created = post as PostData;
+        const parsedPayload = parseBlogmarkCreatedEventPayload(payload);
+        if (!parsedPayload) {
+          return;
+        }
+
+        const created = parsedPayload.post as PostData;
         if (!created?.id) {
           return;
         }
 
+        const outputEntries = buildBlogmarkTransformOutputEntries(parsedPayload.transform, tr);
+        const toastNotifications = buildBlogmarkTransformToastNotifications(parsedPayload.transform, tr);
+
+        toastNotifications.forEach((notification) => {
+          if (notification.kind === 'error') {
+            showToast.error(notification.message);
+            return;
+          }
+
+          showToast.success(notification.message);
+        });
+
+        if (outputEntries.length > 0) {
+          const createdAt = new Date().toISOString();
+          outputEntries.forEach((entry, index) => {
+            appendPanelOutputEntry({
+              id: `blogmark-transform-${Date.now()}-${index}`,
+              createdAt,
+              message: entry.message,
+              kind: entry.kind,
+            });
+          });
+
+          useAppStore.setState({
+            panelVisible: true,
+            panelActiveTab: 'output',
+          });
+        }
+
         blogmarkEventGateRef.current.push(created, processBlogmarkCreated);
       }) || (() => {})
     );

src/renderer/i18n/locales/de.json

@@ -23,6 +23,11 @@
   "tasks.triggerTitle": "{running} laufend, {pending} ausstehend",
   "app.taskCompleted": "Aufgabe abgeschlossen: {message}",
   "app.taskFailed": "Aufgabe fehlgeschlagen: {message}",
+  "app.blogmark.transforms.summary": "Blogmark-Transformationen: {applied} angewendet, {failed} fehlgeschlagen",
+  "app.blogmark.transforms.appliedList": "Angewendete Skripte: {scripts}",
+  "app.blogmark.transforms.failed": "Transformation fehlgeschlagen ({script}): {message}",
+  "app.blogmark.transforms.toast": "Skript-Toast: {message}",
+  "app.blogmark.transforms.errorToast": "Blogmark-Transformationsfehler: {count}",
   "app.databaseRebuildFailed": "Datenbank-Neuaufbau fehlgeschlagen",
   "app.textReindexFailed": "Text-Neuindizierung fehlgeschlagen",
   "app.sitemapGenerationFailed": "Sitemap-Erstellung fehlgeschlagen",

src/renderer/i18n/locales/en.json

@@ -23,6 +23,11 @@
   "tasks.triggerTitle": "{running} running, {pending} pending",
   "app.taskCompleted": "Task completed: {message}",
   "app.taskFailed": "Task failed: {message}",
+  "app.blogmark.transforms.summary": "Blogmark transforms: {applied} applied, {failed} failed",
+  "app.blogmark.transforms.appliedList": "Applied scripts: {scripts}",
+  "app.blogmark.transforms.failed": "Transform failed ({script}): {message}",
+  "app.blogmark.transforms.toast": "Script toast: {message}",
+  "app.blogmark.transforms.errorToast": "Blogmark transform errors: {count}",
   "app.databaseRebuildFailed": "Database rebuild failed",
   "app.textReindexFailed": "Text reindex failed",
   "app.sitemapGenerationFailed": "Sitemap generation failed",

src/renderer/i18n/locales/es.json

@@ -23,6 +23,11 @@
   "tasks.triggerTitle": "{running} en ejecución, {pending} pendiente",
   "app.taskCompleted": "Tarea completada: {message}",
   "app.taskFailed": "Tarea fallida: {message}",
+  "app.blogmark.transforms.summary": "Transformaciones de blogmark: {applied} aplicadas, {failed} fallidas",
+  "app.blogmark.transforms.appliedList": "Scripts aplicados: {scripts}",
+  "app.blogmark.transforms.failed": "Transformación fallida ({script}): {message}",
+  "app.blogmark.transforms.toast": "Toast del script: {message}",
+  "app.blogmark.transforms.errorToast": "Errores de transformación de blogmark: {count}",
   "app.databaseRebuildFailed": "La reconstrucción de la base de datos falló",
   "app.textReindexFailed": "La reindexación de texto falló",
   "app.sitemapGenerationFailed": "La generación del sitemap falló",

src/renderer/i18n/locales/fr.json

@@ -23,6 +23,11 @@
   "tasks.triggerTitle": "{running} en cours, {pending} en attente",
   "app.taskCompleted": "Tâche terminée : {message}",
   "app.taskFailed": "Échec de la tâche : {message}",
+  "app.blogmark.transforms.summary": "Transformations blogmark : {applied} appliquées, {failed} en échec",
+  "app.blogmark.transforms.appliedList": "Scripts appliqués : {scripts}",
+  "app.blogmark.transforms.failed": "Échec de transformation ({script}) : {message}",
+  "app.blogmark.transforms.toast": "Toast du script : {message}",
+  "app.blogmark.transforms.errorToast": "Erreurs de transformation blogmark : {count}",
   "app.databaseRebuildFailed": "Échec de la reconstruction de la base de données",
   "app.textReindexFailed": "Échec de la réindexation du texte",
   "app.sitemapGenerationFailed": "Échec de la génération du sitemap",

src/renderer/i18n/locales/it.json

@@ -23,6 +23,11 @@
   "tasks.triggerTitle": "{running} in esecuzione, {pending} in attesa",
   "app.taskCompleted": "Attività completata: {message}",
   "app.taskFailed": "Attività non riuscita: {message}",
+  "app.blogmark.transforms.summary": "Trasformazioni blogmark: {applied} applicate, {failed} non riuscite",
+  "app.blogmark.transforms.appliedList": "Script applicati: {scripts}",
+  "app.blogmark.transforms.failed": "Trasformazione non riuscita ({script}): {message}",
+  "app.blogmark.transforms.toast": "Toast script: {message}",
+  "app.blogmark.transforms.errorToast": "Errori di trasformazione blogmark: {count}",
   "app.databaseRebuildFailed": "Ricostruzione database non riuscita",
   "app.textReindexFailed": "Reindicizzazione testo non riuscita",
   "app.sitemapGenerationFailed": "Generazione sitemap non riuscita",

src/renderer/navigation/blogmarkTransformOutput.ts

@@ -0,0 +1,168 @@
+import type { PanelOutputEntry, PostData } from '../store';
+
+export interface BlogmarkTransformDebugError {
+  scriptId: string;
+  scriptSlug: string;
+  message: string;
+}
+
+export interface BlogmarkTransformDebugInfo {
+  appliedScriptIds: string[];
+  errors: BlogmarkTransformDebugError[];
+  toasts: string[];
+}
+
+export interface BlogmarkTransformToastNotification {
+  kind: 'success' | 'error';
+  message: string;
+}
+
+export interface BlogmarkCreatedEventPayload {
+  post: PostData;
+  transform?: BlogmarkTransformDebugInfo;
+}
+
+function isRecord(value: unknown): value is Record<string, unknown> {
+  return typeof value === 'object' && value !== null && !Array.isArray(value);
+}
+
+function parseTransformDebugInfo(value: unknown): BlogmarkTransformDebugInfo | undefined {
+  if (!isRecord(value)) {
+    return undefined;
+  }
+
+  const appliedScriptIds = Array.isArray(value.appliedScriptIds)
+    ? value.appliedScriptIds.filter((item): item is string => typeof item === 'string')
+    : [];
+
+  const errors = Array.isArray(value.errors)
+    ? value.errors
+      .map((entry) => {
+        if (!isRecord(entry)) {
+          return null;
+        }
+
+        const scriptId = typeof entry.scriptId === 'string' ? entry.scriptId : '';
+        const scriptSlug = typeof entry.scriptSlug === 'string' ? entry.scriptSlug : '';
+        const message = typeof entry.message === 'string' ? entry.message : '';
+
+        if (!scriptId || !scriptSlug || !message) {
+          return null;
+        }
+
+        return {
+          scriptId,
+          scriptSlug,
+          message,
+        };
+      })
+      .filter((item): item is BlogmarkTransformDebugError => item !== null)
+    : [];
+
+  const toasts = Array.isArray(value.toasts)
+    ? value.toasts
+      .map((entry) => (typeof entry === 'string' ? entry.trim() : ''))
+      .filter((entry) => entry.length > 0)
+    : [];
+
+  if (appliedScriptIds.length === 0 && errors.length === 0 && toasts.length === 0) {
+    return undefined;
+  }
+
+  return {
+    appliedScriptIds,
+    errors,
+    toasts,
+  };
+}
+
+export function parseBlogmarkCreatedEventPayload(payload: unknown): BlogmarkCreatedEventPayload | null {
+  if (!isRecord(payload)) {
+    return null;
+  }
+
+  if (isRecord(payload.post)) {
+    return {
+      post: payload.post as PostData,
+      transform: parseTransformDebugInfo(payload.transform),
+    };
+  }
+
+  return {
+    post: payload as PostData,
+    transform: undefined,
+  };
+}
+
+export function buildBlogmarkTransformOutputEntries(
+  transform: BlogmarkTransformDebugInfo | undefined,
+  t: (key: string, values?: Record<string, string | number>) => string,
+): Array<Omit<PanelOutputEntry, 'id' | 'createdAt'>> {
+  if (!transform) {
+    return [];
+  }
+
+  const entries: Array<Omit<PanelOutputEntry, 'id' | 'createdAt'>> = [];
+  entries.push({
+    kind: 'result',
+    message: t('app.blogmark.transforms.summary', {
+      applied: transform.appliedScriptIds.length,
+      failed: transform.errors.length,
+    }),
+  });
+
+  if (transform.appliedScriptIds.length > 0) {
+    entries.push({
+      kind: 'result',
+      message: t('app.blogmark.transforms.appliedList', {
+        scripts: transform.appliedScriptIds.join(', '),
+      }),
+    });
+  }
+
+  for (const toastMessage of transform.toasts) {
+    entries.push({
+      kind: 'result',
+      message: t('app.blogmark.transforms.toast', {
+        message: toastMessage,
+      }),
+    });
+  }
+
+  for (const error of transform.errors) {
+    entries.push({
+      kind: 'error',
+      message: t('app.blogmark.transforms.failed', {
+        script: error.scriptSlug,
+        message: error.message,
+      }),
+    });
+  }
+
+  return entries;
+}
+
+export function buildBlogmarkTransformToastNotifications(
+  transform: BlogmarkTransformDebugInfo | undefined,
+  t: (key: string, values?: Record<string, string | number>) => string,
+): BlogmarkTransformToastNotification[] {
+  if (!transform) {
+    return [];
+  }
+
+  const notifications: BlogmarkTransformToastNotification[] = transform.toasts.map((message) => ({
+    kind: 'success',
+    message,
+  }));
+
+  if (transform.errors.length > 0) {
+    notifications.push({
+      kind: 'error',
+      message: t('app.blogmark.transforms.errorToast', {
+        count: transform.errors.length,
+      }),
+    });
+  }
+
+  return notifications;
+}

tests/engine/BlogmarkTransformService.test.ts

@@ -0,0 +1,249 @@
+import { describe, expect, it, vi } from 'vitest';
+import type { ScriptData } from '../../src/main/shared/electronApi';
+import {
+  BlogmarkTransformService,
+  type BlogmarkTransformExecutor,
+  type BlogmarkTransformInput,
+  type BlogmarkTransformScriptProvider,
+} from '../../src/main/engine/BlogmarkTransformService';
+
+function createScript(overrides: Partial<ScriptData>): ScriptData {
+  const baseDate = '2026-02-23T00:00:00.000Z';
+  return {
+    id: 'script-default',
+    projectId: 'default',
+    slug: 'script_default',
+    title: 'Default Script',
+    kind: 'transform',
+    entrypoint: 'transform',
+    enabled: true,
+    version: 1,
+    filePath: '/tmp/default.py',
+    content: 'def transform(payload):\n    return payload',
+    createdAt: baseDate,
+    updatedAt: baseDate,
+    ...overrides,
+  };
+}
+
+function createInput(overrides: Partial<BlogmarkTransformInput> = {}): BlogmarkTransformInput {
+  return {
+    post: {
+      title: 'Hello',
+      content: '[Hello](https://example.com)',
+      tags: ['inbox'],
+      categories: ['blogmark'],
+    },
+    context: {
+      source: 'blogmark',
+      url: 'https://example.com',
+    },
+    ...overrides,
+  };
+}
+
+describe('BlogmarkTransformService', () => {
+  it('applies enabled transform scripts sequentially in deterministic order', async () => {
+    const scripts: ScriptData[] = [
+      createScript({ id: 'b', slug: 'b', updatedAt: '2026-02-23T00:00:01.000Z' }),
+      createScript({ id: 'a', slug: 'a', updatedAt: '2026-02-23T00:00:01.000Z' }),
+      createScript({ id: 'c', slug: 'c', updatedAt: '2026-02-23T00:00:00.000Z' }),
+    ];
+
+    const executionOrder: string[] = [];
+    const executor: BlogmarkTransformExecutor = {
+      runTransform: vi.fn(async (script, input) => {
+        executionOrder.push(script.id);
+        return {
+          post: {
+            ...input.post,
+            title: `${input.post.title}:${script.id}`,
+          },
+        };
+      }),
+    };
+
+    const provider: BlogmarkTransformScriptProvider = {
+      getScripts: vi.fn(async () => scripts),
+    };
+
+    const service = new BlogmarkTransformService({ executor, provider });
+
+    const result = await service.applyTransforms(createInput());
+
+    expect(executionOrder).toEqual(['c', 'a', 'b']);
+    expect(result.post.title).toBe('Hello:c:a:b');
+    expect(result.appliedScriptIds).toEqual(['c', 'a', 'b']);
+    expect(result.errors).toEqual([]);
+    expect(result.toasts).toEqual([]);
+  });
+
+  it('skips disabled and non-transform scripts', async () => {
+    const scripts: ScriptData[] = [
+      createScript({ id: 'transform-enabled', kind: 'transform', enabled: true }),
+      createScript({ id: 'transform-disabled', kind: 'transform', enabled: false }),
+      createScript({ id: 'macro-enabled', kind: 'macro', enabled: true }),
+      createScript({ id: 'utility-enabled', kind: 'utility', enabled: true }),
+    ];
+
+    const executor: BlogmarkTransformExecutor = {
+      runTransform: vi.fn(async (script, input) => ({
+        post: {
+          ...input.post,
+          title: `${input.post.title}:${script.id}`,
+        },
+      })),
+    };
+
+    const service = new BlogmarkTransformService({
+      executor,
+      provider: { getScripts: async () => scripts },
+    });
+
+    const result = await service.applyTransforms(createInput());
+
+    expect(result.post.title).toBe('Hello:transform-enabled');
+    expect(result.appliedScriptIds).toEqual(['transform-enabled']);
+    expect(result.errors).toEqual([]);
+    expect(result.toasts).toEqual([]);
+  });
+
+  it('continues with next scripts when one transform fails', async () => {
+    const scripts: ScriptData[] = [
+      createScript({ id: 'first', slug: 'first' }),
+      createScript({ id: 'broken', slug: 'broken' }),
+      createScript({ id: 'last', slug: 'last' }),
+    ];
+
+    const executor: BlogmarkTransformExecutor = {
+      runTransform: vi.fn(async (script, input) => {
+        if (script.id === 'broken') {
+          throw new Error('boom');
+        }
+
+        return {
+          post: {
+            ...input.post,
+            title: `${input.post.title}:${script.id}`,
+          },
+        };
+      }),
+    };
+
+    const service = new BlogmarkTransformService({
+      executor,
+      provider: { getScripts: async () => scripts },
+    });
+
+    const result = await service.applyTransforms(createInput());
+
+    expect(result.post.title).toBe('Hello:first:last');
+    expect(result.appliedScriptIds).toEqual(['first', 'last']);
+    expect(result.errors).toEqual([
+      {
+        scriptId: 'broken',
+        scriptSlug: 'broken',
+        message: 'boom',
+      },
+    ]);
+    expect(result.toasts).toEqual([]);
+  });
+
+  it('rejects invalid transform result and keeps latest valid post', async () => {
+    const scripts: ScriptData[] = [
+      createScript({ id: 'valid-1', slug: 'valid-1' }),
+      createScript({ id: 'invalid', slug: 'invalid' }),
+      createScript({ id: 'valid-2', slug: 'valid-2' }),
+    ];
+
+    const executor: BlogmarkTransformExecutor = {
+      runTransform: vi.fn(async (script, input) => {
+        if (script.id === 'invalid') {
+          return {
+            post: {
+              title: '',
+              content: '',
+              tags: [],
+              categories: [],
+            },
+          };
+        }
+
+        return {
+          title: `${input.post.title}:${script.id}`,
+          content: input.post.content,
+          tags: input.post.tags,
+          categories: input.post.categories,
+        };
+      }),
+    };
+
+    const service = new BlogmarkTransformService({
+      executor,
+      provider: { getScripts: async () => scripts },
+    });
+
+    const result = await service.applyTransforms(createInput());
+
+    expect(result.post.title).toBe('Hello:valid-1:valid-2');
+    expect(result.appliedScriptIds).toEqual(['valid-1', 'valid-2']);
+    expect(result.errors).toEqual([
+      {
+        scriptId: 'invalid',
+        scriptSlug: 'invalid',
+        message: 'Transform output validation failed',
+      },
+    ]);
+    expect(result.toasts).toEqual([]);
+  });
+
+  it('allows transforms to set multiple categories and add tags', async () => {
+    const scripts: ScriptData[] = [
+      createScript({ id: 'taxonomy', slug: 'taxonomy' }),
+    ];
+
+    const executor: BlogmarkTransformExecutor = {
+      runTransform: vi.fn(async (_script, input) => ({
+        output: {
+          ...input.post,
+          tags: [...input.post.tags, 'reading-list', 'python'],
+          categories: ['link', 'reference'],
+        },
+        toasts: [],
+      })),
+    };
+
+    const service = new BlogmarkTransformService({
+      executor,
+      provider: { getScripts: async () => scripts },
+    });
+
+    const result = await service.applyTransforms(createInput());
+
+    expect(result.post.tags).toEqual(['inbox', 'reading-list', 'python']);
+    expect(result.post.categories).toEqual(['link', 'reference']);
+  });
+
+  it('collects toast intents emitted by transform scripts', async () => {
+    const scripts: ScriptData[] = [
+      createScript({ id: 'alpha', slug: 'alpha' }),
+      createScript({ id: 'beta', slug: 'beta' }),
+    ];
+
+    const executor: BlogmarkTransformExecutor = {
+      runTransform: vi.fn(async (_script, input) => ({
+        post: input.post,
+        toasts: ['Step finished'],
+      })),
+    };
+
+    const service = new BlogmarkTransformService({
+      executor,
+      provider: { getScripts: async () => scripts },
+    });
+
+    const result = await service.applyTransforms(createInput());
+
+    expect(result.toasts).toEqual(['Step finished', 'Step finished']);
+  });
+});

tests/engine/mainStartup.test.ts

@@ -740,6 +740,17 @@ describe('main bootstrap preview behavior', () => {
       })),
     }));
 
+    vi.doMock('../../src/main/engine/BlogmarkTransformService', () => ({
+      getBlogmarkTransformService: vi.fn(() => ({
+        applyTransforms: vi.fn(async (input: { post: { title: string; content: string; categories: string[] } }) => ({
+          post: input.post,
+          appliedScriptIds: [],
+          errors: [],
+          toasts: [],
+        })),
+      })),
+    }));
+
     vi.doMock('../../src/main/database', () => ({
       getDatabase: vi.fn(() => ({
         initializeLocal: vi.fn().mockResolvedValue(undefined),
@@ -802,7 +813,14 @@ describe('main bootstrap preview behavior', () => {
 
     expect(windows[0]?.webContents.send).toHaveBeenCalledWith(
       'blogmark:created',
-      expect.objectContaining({ id: 'new-post-id' }),
+      expect.objectContaining({
+        post: expect.objectContaining({ id: 'new-post-id' }),
+        transform: expect.objectContaining({
+          appliedScriptIds: [],
+          errors: [],
+          toasts: [],
+        }),
+      }),
     );
   });
 
@@ -903,6 +921,17 @@ describe('main bootstrap preview behavior', () => {
       })),
     }));
 
+    vi.doMock('../../src/main/engine/BlogmarkTransformService', () => ({
+      getBlogmarkTransformService: vi.fn(() => ({
+        applyTransforms: vi.fn(async (input: { post: { title: string; content: string; categories: string[] } }) => ({
+          post: input.post,
+          appliedScriptIds: [],
+          errors: [],
+          toasts: [],
+        })),
+      })),
+    }));
+
     vi.doMock('../../src/main/database', () => ({
       getDatabase: vi.fn(() => ({
         initializeLocal: vi.fn().mockResolvedValue(undefined),
@@ -971,7 +1000,14 @@ describe('main bootstrap preview behavior', () => {
 
     expect(windows[0]?.webContents.send).toHaveBeenCalledWith(
       'blogmark:created',
-      expect.objectContaining({ id: 'queued-post-id' }),
+      expect.objectContaining({
+        post: expect.objectContaining({ id: 'queued-post-id' }),
+        transform: expect.objectContaining({
+          appliedScriptIds: [],
+          errors: [],
+          toasts: [],
+        }),
+      }),
     );
   });
 

tests/renderer/navigation/blogmarkTransformOutput.test.ts

@@ -0,0 +1,125 @@
+import { describe, expect, it } from 'vitest';
+import {
+  buildBlogmarkTransformOutputEntries,
+  buildBlogmarkTransformToastNotifications,
+  parseBlogmarkCreatedEventPayload,
+} from '../../../src/renderer/navigation/blogmarkTransformOutput';
+
+describe('parseBlogmarkCreatedEventPayload', () => {
+  it('parses legacy payload shape where event value is the post itself', () => {
+    const payload = parseBlogmarkCreatedEventPayload({ id: 'post-1', title: 'Legacy post' });
+
+    expect(payload).toEqual({
+      post: { id: 'post-1', title: 'Legacy post' },
+      transform: undefined,
+    });
+  });
+
+  it('parses new payload shape with post and transform metadata', () => {
+    const payload = parseBlogmarkCreatedEventPayload({
+      post: { id: 'post-2', title: 'With transforms' },
+      transform: {
+        appliedScriptIds: ['a', 'b'],
+        errors: [{ scriptId: 'c', scriptSlug: 'c', message: 'boom' }],
+        toasts: ['done'],
+      },
+    });
+
+    expect(payload).toEqual({
+      post: { id: 'post-2', title: 'With transforms' },
+      transform: {
+        appliedScriptIds: ['a', 'b'],
+        errors: [{ scriptId: 'c', scriptSlug: 'c', message: 'boom' }],
+        toasts: ['done'],
+      },
+    });
+  });
+});
+
+describe('buildBlogmarkTransformOutputEntries', () => {
+  const t = (key: string, values?: Record<string, string | number>) => {
+    if (key === 'app.blogmark.transforms.summary') {
+      return `summary:${values?.applied}:${values?.failed}`;
+    }
+    if (key === 'app.blogmark.transforms.appliedList') {
+      return `applied:${values?.scripts}`;
+    }
+    if (key === 'app.blogmark.transforms.failed') {
+      return `failed:${values?.script}:${values?.message}`;
+    }
+    if (key === 'app.blogmark.transforms.toast') {
+      return `toast:${values?.message}`;
+    }
+    if (key === 'app.blogmark.transforms.errorToast') {
+      return `error-toast:${values?.count}`;
+    }
+    return key;
+  };
+
+  it('returns empty list when no transform info is provided', () => {
+    expect(buildBlogmarkTransformOutputEntries(undefined, t)).toEqual([]);
+  });
+
+  it('returns summary and applied list entries for successful transforms', () => {
+    const entries = buildBlogmarkTransformOutputEntries(
+      {
+        appliedScriptIds: ['alpha', 'beta'],
+        errors: [],
+        toasts: [],
+      },
+      t,
+    );
+
+    expect(entries).toHaveLength(2);
+    expect(entries[0]?.kind).toBe('result');
+    expect(entries[0]?.message).toBe('summary:2:0');
+    expect(entries[1]?.kind).toBe('result');
+    expect(entries[1]?.message).toBe('applied:alpha, beta');
+  });
+
+  it('returns one error entry per failed transform', () => {
+    const entries = buildBlogmarkTransformOutputEntries(
+      {
+        appliedScriptIds: ['alpha'],
+        errors: [
+          { scriptId: 'broken', scriptSlug: 'broken_slug', message: 'boom' },
+          { scriptId: 'bad', scriptSlug: 'bad_slug', message: 'invalid output' },
+        ],
+        toasts: ['Step finished'],
+      },
+      t,
+    );
+
+    expect(entries).toHaveLength(5);
+    expect(entries[0]?.message).toBe('summary:1:2');
+    expect(entries[1]?.message).toBe('applied:alpha');
+    expect(entries[2]?.kind).toBe('result');
+    expect(entries[2]?.message).toBe('toast:Step finished');
+    expect(entries[3]?.kind).toBe('error');
+    expect(entries[3]?.message).toBe('failed:broken_slug:boom');
+    expect(entries[4]?.kind).toBe('error');
+    expect(entries[4]?.message).toBe('failed:bad_slug:invalid output');
+  });
+});
+
+describe('buildBlogmarkTransformToastNotifications', () => {
+  const t = (key: string, values?: Record<string, string | number>) => {
+    if (key === 'app.blogmark.transforms.errorToast') {
+      return `error-toast:${values?.count}`;
+    }
+    return key;
+  };
+
+  it('returns toast notifications for script toasts and aggregated errors', () => {
+    const notifications = buildBlogmarkTransformToastNotifications({
+      appliedScriptIds: ['alpha'],
+      toasts: ['Saved one item'],
+      errors: [{ scriptId: 'broken', scriptSlug: 'broken_slug', message: 'boom' }],
+    }, t);
+
+    expect(notifications).toEqual([
+      { kind: 'success', message: 'Saved one item' },
+      { kind: 'error', message: 'error-toast:1' },
+    ]);
+  });
+});