feat: hooked the APIs of the app into the pyoide core.

.github/copilot-instructions.md

@@ -102,6 +102,23 @@ See the [TDD Requirements](#test-driven-development-tdd-requirements) section fo
 
 ---
 
+## ⚠️ MANDATORY: Keep Python API Bindings and API Docs in Sync
+
+**Whenever any app API is added, removed, or changed, you MUST update the Python API bridge and API documentation in the same change set.**
+
+- Update the Python API contract/bindings used by embedded Pyodide (`bds_api`)
+- Regenerate and commit `API.md`
+- Ensure every API entry documents:
+  - Parameter names, types, and required/optional status
+  - Return type/response specification
+  - At least one sample Python call
+- Maintain a shared **Data Structures** section in `API.md` for canonical objects (for example `PostData`, `MediaData`) so users can see expected attributes in one place
+- Keep docs sync tests passing (documentation and generator output must match)
+
+> **No API contract drift between app APIs, Python bindings, and API.md. No exceptions.**
+
+---
+
 ## Architecture Principles
 
 ### Separation of Concerns

package.json

@@ -27,6 +27,7 @@
     "test:coverage": "vitest run --coverage",
     "test:ui": "vitest --ui",
     "bench:python-runtime": "node ./node_modules/tsx/dist/cli.mjs scripts/python-runtime-benchmark.ts",
+    "docs:api": "node ./node_modules/tsx/dist/cli.mjs scripts/generate-api-docs.ts",
     "lint": "eslint \"src/renderer/**/*.{ts,tsx}\" --max-warnings 0",
     "lint:i18n": "eslint \"src/renderer/**/*.{ts,tsx}\" --max-warnings 0",
     "db:generate": "node ./node_modules/drizzle-kit/bin.cjs generate",
@@ -136,6 +137,14 @@
         "from": "drizzle",
         "to": "drizzle"
       },
+      {
+        "from": "API.md",
+        "to": "docs/API.md"
+      },
+      {
+        "from": "DOCUMENTATION.md",
+        "to": "docs/DOCUMENTATION.md"
+      },
       {
         "from": "src/main/engine/templates",
         "to": "templates"

scripts/generate-api-docs.ts

@@ -0,0 +1,12 @@
+import { writeFile } from 'node:fs/promises';
+import { resolve } from 'node:path';
+import { generateApiDocumentationMarkdownV1 } from '../src/renderer/python/generateApiDocumentationMarkdownV1';
+
+async function main(): Promise<void> {
+  const outputPath = resolve(process.cwd(), 'API.md');
+  const markdown = generateApiDocumentationMarkdownV1();
+  await writeFile(outputPath, markdown, 'utf8');
+  console.log(`Generated API documentation at ${outputPath}`);
+}
+
+void main();

src/main/shared/i18n/locales/de.json

@@ -42,6 +42,7 @@
   "menu.item.validateSite": "Website validieren",
   "menu.item.about": "Über Blogging Desktop Server",
   "menu.item.openDocumentation": "Dokumentation öffnen",
+  "menu.item.openApiDocumentation": "API-Dokumentation",
   "menu.item.viewOnGitHub": "Auf GitHub ansehen",
   "menu.item.reportIssue": "Problem melden",
   "render.archive": "Archiv",

src/main/shared/i18n/locales/en.json

@@ -42,6 +42,7 @@
   "menu.item.validateSite": "Validate Site",
   "menu.item.about": "About Blogging Desktop Server",
   "menu.item.openDocumentation": "Open Documentation",
+  "menu.item.openApiDocumentation": "API documentation",
   "menu.item.viewOnGitHub": "View on GitHub",
   "menu.item.reportIssue": "Report Issue",
   "render.archive": "Archive",

src/main/shared/i18n/locales/es.json

@@ -42,6 +42,7 @@
   "menu.item.validateSite": "Validar sitio",
   "menu.item.about": "Acerca de Blogging Desktop Server",
   "menu.item.openDocumentation": "Abrir documentación",
+  "menu.item.openApiDocumentation": "Documentación API",
   "menu.item.viewOnGitHub": "Ver en GitHub",
   "menu.item.reportIssue": "Reportar problema",
   "render.archive": "Archivo",

src/main/shared/i18n/locales/fr.json

@@ -42,6 +42,7 @@
   "menu.item.validateSite": "Valider le site",
   "menu.item.about": "À propos de Blogging Desktop Server",
   "menu.item.openDocumentation": "Ouvrir la documentation",
+  "menu.item.openApiDocumentation": "Documentation API",
   "menu.item.viewOnGitHub": "Voir sur GitHub",
   "menu.item.reportIssue": "Signaler un problème",
   "render.archive": "Archives",

src/main/shared/i18n/locales/it.json

@@ -42,6 +42,7 @@
   "menu.item.validateSite": "Valida sito",
   "menu.item.about": "Informazioni su Blogging Desktop Server",
   "menu.item.openDocumentation": "Apri documentazione",
+  "menu.item.openApiDocumentation": "Documentazione API",
   "menu.item.viewOnGitHub": "Visualizza su GitHub",
   "menu.item.reportIssue": "Segnala problema",
   "render.archive": "Archivio",

src/main/shared/menuCommands.ts

@@ -36,6 +36,7 @@ export type AppMenuAction =
   | 'regenerateCalendar'
   | 'validateSite'
   | 'openDocumentation'
+  | 'openApiDocumentation'
   | 'about'
   | 'viewOnGitHub'
   | 'reportIssue';
@@ -136,6 +137,7 @@ export const APP_MENU_GROUPS: AppMenuGroupDefinition[] = [
     items: [
       { label: 'menu.item.about', action: 'about' },
       { label: 'menu.item.openDocumentation', action: 'openDocumentation' },
+      { label: 'menu.item.openApiDocumentation', action: 'openApiDocumentation' },
       { label: '', action: 'help-separator-1', separator: true },
       { label: 'menu.item.viewOnGitHub', action: 'viewOnGitHub' },
       { label: 'menu.item.reportIssue', action: 'reportIssue' },
@@ -165,6 +167,7 @@ export const APP_MENU_ACTION_EVENT_MAP: Partial<Record<AppMenuAction, string>> =
   regenerateCalendar: 'menu:regenerateCalendar',
   validateSite: 'menu:validateSite',
   openDocumentation: 'menu:openDocumentation',
+  openApiDocumentation: 'menu:openApiDocumentation',
   about: 'menu:about',
 };
 

src/renderer/App.tsx

@@ -494,6 +494,12 @@ const App: React.FC = () => {
       }) || (() => {})
     );
 
+    unsubscribers.push(
+      window.electronAPI?.on('menu:openApiDocumentation', () => {
+        openSingletonToolTab(openTab, 'api-documentation');
+      }) || (() => {})
+    );
+
     // Import completion event - refresh posts and media stores
     unsubscribers.push(
       window.electronAPI?.import.onComplete(async (data) => {

src/renderer/components/DocumentationView/DocumentationView.tsx

@@ -2,7 +2,7 @@ import React, { useEffect, useRef } from 'react';
 import Markdown from 'marked-react';
 import hljs from '@highlightjs/cdn-assets/es/highlight.min.js';
 import type { ReactNode } from 'react';
-import documentationContent from '../../../../DOCUMENTATION.md?raw';
+import defaultDocumentationContent from '../../../../DOCUMENTATION.md?raw';
 import { useAppStore } from '../../store';
 import { useI18n } from '../../i18n';
 import { ensureRendererPicoThemeStylesheet, getRendererPicoTheme } from '../../utils/picoTheme';
@@ -84,7 +84,17 @@ function resolveTargetHeadingInArticle(articleElement: HTMLElement, targetId: st
   return null;
 }
 
-export const DocumentationView: React.FC = () => {
+interface DocumentationViewProps {
+  content?: string;
+  titleKey?: string;
+  subtitleKey?: string;
+}
+
+export const DocumentationView: React.FC<DocumentationViewProps> = ({
+  content = defaultDocumentationContent,
+  titleKey = 'docs.title',
+  subtitleKey = 'docs.subtitle',
+}) => {
   const { t: tr } = useI18n();
   const { picoTheme } = useAppStore();
   const resolvedTheme = getRendererPicoTheme(picoTheme);
@@ -258,8 +268,8 @@ export const DocumentationView: React.FC = () => {
   return (
     <div className="documentation-view">
       <div className="documentation-header">
-        <h1>{tr('docs.title')}</h1>
+        <h1>{tr(titleKey)}</h1>
-        <p>{tr('docs.subtitle')}</p>
+        <p>{tr(subtitleKey)}</p>
       </div>
       <main
         className="documentation-scroll"
@@ -267,7 +277,7 @@ export const DocumentationView: React.FC = () => {
       >
         <div className="documentation-content markdown-body pico" data-theme="auto" data-pico-theme={resolvedTheme}>
           <article className="documentation-article" ref={articleRef}>
-            <Markdown renderer={markdownRenderer}>{documentationContent}</Markdown>
+            <Markdown renderer={markdownRenderer}>{content}</Markdown>
           </article>
         </div>
       </main>

src/renderer/components/Editor/Editor.tsx

@@ -26,6 +26,8 @@ import { AISuggestionsModal, AISuggestions } from '../AISuggestionsModal/AISugge
 import { openEntityTab } from '../../navigation/tabPolicy';
 import { EditorRoute, resolveEditorRoute } from '../../navigation/editorRouting';
 import { useI18n } from '../../i18n';
+import documentationContent from '../../../../DOCUMENTATION.md?raw';
+import apiDocumentationContent from '../../../../API.md?raw';
 import './Editor.css';
 
 const UI_DATE_LOCALE: Record<string, string> = {
@@ -1781,7 +1783,20 @@ export const Editor: React.FC = () => {
       editorRoute.tabId && editorRoute.gitDiffResource
         ? <GitDiffView key={editorRoute.tabId} filePath={editorRoute.gitDiffResource} />
         : <Dashboard />,
-    documentation: () => <DocumentationView />,
+    documentation: () => (
+      <DocumentationView
+        content={documentationContent}
+        titleKey="docs.title"
+        subtitleKey="docs.subtitle"
+      />
+    ),
+    'api-documentation': () => (
+      <DocumentationView
+        content={apiDocumentationContent}
+        titleKey="docs.apiTitle"
+        subtitleKey="docs.apiSubtitle"
+      />
+    ),
     'site-validation': () => <SiteValidationView />,
     scripts: () => <ScriptsView scriptId={editorRoute.tabId} />,
     post: () => (editorRoute.tabId ? <PostEditor key={editorRoute.tabId} postId={editorRoute.tabId} /> : <Dashboard />),

src/renderer/components/TabBar/TabBar.tsx

@@ -77,6 +77,10 @@ const getTabTitle = (
     return tr('docs.title');
   }
 
+  if (tab.type === 'api-documentation') {
+    return tr('docs.apiTitle');
+  }
+
   if (tab.type === 'site-validation') {
     return tr('siteValidation.tabTitle');
   }
@@ -157,6 +161,13 @@ const getTabIcon = (tab: Tab): React.ReactNode => {
           <path d="M5 4h6v1H5V4zm0 2h6v1H5V6zm0 2h6v1H5V8zm0 2h4v1H5v-1z"/>
         </svg>
       );
+    case 'api-documentation':
+      return (
+        <svg width="16" height="16" viewBox="0 0 16 16" fill="currentColor">
+          <path d="M2.5 2A1.5 1.5 0 0 0 1 3.5v9A1.5 1.5 0 0 0 2.5 14h11a1.5 1.5 0 0 0 1.5-1.5v-9A1.5 1.5 0 0 0 13.5 2h-11zm0 1h11a.5.5 0 0 1 .5.5v9a.5.5 0 0 1-.5.5h-11a.5.5 0 0 1-.5-.5v-9a.5.5 0 0 1 .5-.5z"/>
+          <path d="M4 5h2v1H4V5zm3 0h5v1H7V5zM4 7.5h2v1H4v-1zm3 0h5v1H7v-1zM4 10h2v1H4v-1zm3 0h5v1H7v-1z"/>
+        </svg>
+      );
     case 'site-validation':
       return (
         <svg width="16" height="16" viewBox="0 0 16 16" fill="currentColor">

src/renderer/i18n/locales/de.json

@@ -253,6 +253,8 @@
   "postLinks.openTitle": "Öffnen: {title}",
   "docs.title": "Dokumentation",
   "docs.subtitle": "Benutzerhandbuch für diese installierte bDS-Version.",
+  "docs.apiTitle": "API-Dokumentation",
+  "docs.apiSubtitle": "Vollständige Referenz aller Python-Runtime-API-Aufrufe.",
   "docs.copyCode": "Code kopieren",
   "gitDiff.header": "Unterschied: {target}",
   "gitDiff.noProject": "Kein aktives Projekt ausgewählt.",

src/renderer/i18n/locales/en.json

@@ -253,6 +253,8 @@
   "postLinks.openTitle": "Open: {title}",
   "docs.title": "Documentation",
   "docs.subtitle": "User guide for this installed bDS version.",
+  "docs.apiTitle": "API Documentation",
+  "docs.apiSubtitle": "Complete reference of Python runtime API calls.",
   "docs.copyCode": "Copy code",
   "gitDiff.header": "Diff: {target}",
   "gitDiff.noProject": "No active project selected.",

src/renderer/i18n/locales/es.json

@@ -253,6 +253,8 @@
   "postLinks.openTitle": "Abrir: {title}",
   "docs.title": "Documentación",
   "docs.subtitle": "Guía de usuario para esta versión instalada de bDS.",
+  "docs.apiTitle": "Documentación API",
+  "docs.apiSubtitle": "Referencia completa de llamadas API del runtime de Python.",
   "docs.copyCode": "Copiar código",
   "gitDiff.header": "Diferencia: {target}",
   "gitDiff.noProject": "No hay un proyecto activo seleccionado.",

src/renderer/i18n/locales/fr.json

@@ -253,6 +253,8 @@
   "postLinks.openTitle": "Ouvrir: {title}",
   "docs.title": "Guide utilisateur",
   "docs.subtitle": "Guide utilisateur pour cette version installée de bDS.",
+  "docs.apiTitle": "Documentation API",
+  "docs.apiSubtitle": "Référence complète des appels API Python Runtime.",
   "docs.copyCode": "Copier le code",
   "gitDiff.header": "Diff : {target}",
   "gitDiff.noProject": "Aucun projet actif sélectionné.",

src/renderer/i18n/locales/it.json

@@ -253,6 +253,8 @@
   "postLinks.openTitle": "Apri: {title}",
   "docs.title": "Documentazione",
   "docs.subtitle": "Guida utente per questa versione installata di bDS.",
+  "docs.apiTitle": "Documentazione API",
+  "docs.apiSubtitle": "Riferimento completo delle chiamate API del runtime Python.",
   "docs.copyCode": "Copia codice",
   "gitDiff.header": "Differenza: {target}",
   "gitDiff.noProject": "Nessun progetto attivo selezionato.",

src/renderer/navigation/editorRouting.ts

@@ -14,6 +14,7 @@ export type EditorRoute =
   | 'metadata-diff'
   | 'git-diff'
   | 'documentation'
+  | 'api-documentation'
   | 'site-validation'
   | 'scripts';
 
@@ -29,6 +30,7 @@ export const EDITOR_TAB_ROUTE_REGISTRY: Record<TabType, Exclude<EditorRoute, 'da
   'metadata-diff': 'metadata-diff',
   'git-diff': 'git-diff',
   documentation: 'documentation',
+  'api-documentation': 'api-documentation',
   'site-validation': 'site-validation',
   scripts: 'scripts',
 };

src/renderer/navigation/tabPolicy.ts

@@ -7,6 +7,7 @@ export type SingletonToolTabKey =
   | 'scripts'
   | 'menu-editor'
   | 'documentation'
+  | 'api-documentation'
   | 'metadata-diff'
   | 'site-validation';
 
@@ -28,6 +29,7 @@ const SINGLETON_TOOL_TAB_REGISTRY: Record<SingletonToolTabKey, CanonicalTabSpec>
   scripts: { type: 'scripts', id: 'scripts', isTransient: false },
   'menu-editor': { type: 'menu-editor', id: 'menu-editor', isTransient: false },
   documentation: { type: 'documentation', id: 'documentation', isTransient: false },
+  'api-documentation': { type: 'api-documentation', id: 'api-documentation', isTransient: false },
   'metadata-diff': { type: 'metadata-diff', id: 'metadata-diff', isTransient: false },
   'site-validation': { type: 'site-validation', id: 'site-validation', isTransient: false },
 };

src/renderer/python/PythonRuntimeManager.ts

@@ -2,8 +2,14 @@ import { createPythonRuntimeWorker } from './createPythonRuntimeWorker';
 import type { PythonWorkerMessage, PythonWorkerRequest } from './runtimeProtocol';
 import type { PythonSyntaxError } from './runtimeProtocol';
 import { parseMacroContextV1, parseMacroResultV1, type MacroContextV1, type MacroResultV1 } from './abiV1';
+import { invokePythonApiMethodV1 } from './pythonApiInvokerV1';
 
 type WorkerFactory = () => Worker;
+type PythonApiInvoker = (method: string, args: unknown) => Promise<unknown>;
+
+interface PythonRuntimeManagerOptions {
+  invokeApiCall?: PythonApiInvoker;
+}
 
 interface InitializeDeferred {
   resolve: () => void;
@@ -57,8 +63,14 @@ export class PythonRuntimeManager {
   private requestQueue: PythonWorkerRequest[] = [];
   private activeRequestId: string | null = null;
   private requestCounter = 0;
+  private readonly invokeApiCall: PythonApiInvoker;
 
-  constructor(private readonly workerFactory: WorkerFactory = createPythonRuntimeWorker) {}
+  constructor(
+    private readonly workerFactory: WorkerFactory = createPythonRuntimeWorker,
+    options: PythonRuntimeManagerOptions = {}
+  ) {
+    this.invokeApiCall = options.invokeApiCall ?? invokePythonApiMethodV1;
+  }
 
   initialize(): Promise<void> {
     if (this.ready) {
@@ -262,6 +274,11 @@ export class PythonRuntimeManager {
       return;
     }
 
+    if (payload.type === 'apiCall') {
+      void this.handleApiCall(payload);
+      return;
+    }
+
     const pendingRun = this.pendingRuns.get(payload.requestId);
     if (!pendingRun) {
       if (this.activeRequestId === payload.requestId && payload.type !== 'stdout') {
@@ -335,6 +352,33 @@ export class PythonRuntimeManager {
     this.finishRequest(payload.requestId);
   }
 
+  private async handleApiCall(payload: Extract<PythonWorkerMessage, { type: 'apiCall' }>): Promise<void> {
+    if (!this.worker || !this.ready) {
+      return;
+    }
+
+    try {
+      const result = await this.invokeApiCall(payload.method, payload.args);
+      const response: PythonWorkerRequest = {
+        type: 'apiResult',
+        requestId: payload.requestId,
+        callId: payload.callId,
+        ok: true,
+        result,
+      };
+      this.worker.postMessage(response);
+    } catch (error) {
+      const response: PythonWorkerRequest = {
+        type: 'apiResult',
+        requestId: payload.requestId,
+        callId: payload.callId,
+        ok: false,
+        error: error instanceof Error ? error.message : String(error),
+      };
+      this.worker.postMessage(response);
+    }
+  }
+
   private handleWorkerError(error: Error): void {
     if (this.initializeDeferred) {
       this.initializeDeferred.reject(error);

src/renderer/python/generateApiDocumentationMarkdownV1.ts

@@ -0,0 +1,327 @@
+import {
+  BDS_PYTHON_API_CONTRACT_V1,
+  type PythonApiDataStructureContractV1,
+  type PythonApiParamContractV1,
+} from './pythonApiContractV1';
+
+function toSnakeCase(value: string): string {
+  return value
+    .replace(/([a-z0-9])([A-Z])/g, '$1_$2')
+    .replace(/[^a-zA-Z0-9]+/g, '_')
+    .replace(/^_+|_+$/g, '')
+    .toLowerCase();
+}
+
+function toDocumentationHeadingSlug(value: string): string {
+  return value
+    .normalize('NFKD')
+    .toLowerCase()
+    .replace(/[\u0300-\u036f]/g, '')
+    .replace(/[^a-z0-9\s-]/g, '')
+    .trim()
+    .replace(/\s+/g, '-')
+    .replace(/^-+|-+$/g, '')
+    .replace(/-+/g, '-');
+}
+
+function toPythonTypeName(type: PythonApiParamContractV1['type']): string {
+  switch (type) {
+    case 'string':
+      return 'str';
+    case 'number':
+      return 'int | float';
+    case 'boolean':
+      return 'bool';
+    case 'object':
+      return 'dict';
+    case 'array':
+      return 'list';
+    case 'stringOrNull':
+      return 'str | None';
+    case 'any':
+    default:
+      return 'Any';
+  }
+}
+
+function sampleValueForParam(param: PythonApiParamContractV1): string {
+  const snakeName = toSnakeCase(param.name);
+
+  switch (param.type) {
+    case 'string':
+      if (snakeName.includes('id')) {
+        return `'${snakeName.replace(/_id$/, '')}-1'`;
+      }
+      if (snakeName.includes('query')) {
+        return `'search phrase'`;
+      }
+      return `'${snakeName}'`;
+    case 'number':
+      return '10';
+    case 'boolean':
+      return 'True';
+    case 'object':
+      return '{}';
+    case 'array':
+      return '[]';
+    case 'stringOrNull':
+      return 'None';
+    case 'any':
+    default:
+      return 'None';
+  }
+}
+
+function buildExampleCall(namespace: string, method: string, params: PythonApiParamContractV1[]): string {
+  const pythonMethod = toSnakeCase(method);
+  const requiredParams = params.filter((param) => param.required);
+
+  if (requiredParams.length === 0) {
+    return `result = await bds.${namespace}.${pythonMethod}()`;
+  }
+
+  const args = requiredParams
+    .map((param) => `${toSnakeCase(param.name)}=${sampleValueForParam(param)}`)
+    .join(', ');
+
+  return `result = await bds.${namespace}.${pythonMethod}(${args})`;
+}
+
+function buildResponseExample(returnsType: string): string {
+  const value = returnsType.trim();
+
+  if (value === 'boolean') {
+    return 'True';
+  }
+
+  if (value === 'void') {
+    return 'None';
+  }
+
+  if (value.endsWith('[]') || value.startsWith('Array<')) {
+    return '[]';
+  }
+
+  if (value.includes(' | null')) {
+    return 'None  # or dict-like object when found';
+  }
+
+  if (value === 'string') {
+    return "'value'";
+  }
+
+  return '{}';
+}
+
+function extractDataStructureNames(typeSignature: string): string[] {
+  const matches = typeSignature.match(/\b[A-Z][A-Za-z0-9_]*\b/g) ?? [];
+  const names = matches.filter((name) =>
+    BDS_PYTHON_API_CONTRACT_V1.dataStructures.some((entry) => entry.name === name)
+  );
+
+  return [...new Set(names)];
+}
+
+function sampleValueForField(type: string): string {
+  const normalized = type.trim();
+
+  if (normalized.includes('string')) {
+    return "'value'";
+  }
+
+  if (normalized.includes('number')) {
+    return '0';
+  }
+
+  if (normalized.includes('boolean')) {
+    return 'False';
+  }
+
+  if (normalized.includes('[]')) {
+    return '[]';
+  }
+
+  if (normalized.includes('object') || normalized.includes('Record<')) {
+    return '{}';
+  }
+
+  return 'None';
+}
+
+function buildDataStructureExample(structure: PythonApiDataStructureContractV1): string {
+  const lines: string[] = ['{'];
+
+  structure.fields.forEach((field, index) => {
+    const comma = index < structure.fields.length - 1 ? ',' : '';
+    lines.push(`    '${field.name}': ${sampleValueForField(field.type)}${comma}`);
+  });
+
+  lines.push('}');
+  return lines.join('\n');
+}
+
+function buildResponseExampleWithStructure(returnsType: string): string {
+  const structureNames = extractDataStructureNames(returnsType);
+
+  if (structureNames.length > 0) {
+    const structure = BDS_PYTHON_API_CONTRACT_V1.dataStructures.find((entry) => entry.name === structureNames[0]);
+    if (structure) {
+      if (returnsType.includes('[]') || returnsType.startsWith('Array<')) {
+        return `[\n${buildDataStructureExample(structure)}\n]`;
+      }
+
+      if (returnsType.includes(' | null')) {
+        return `None  # or\n${buildDataStructureExample(structure)}`;
+      }
+
+      return buildDataStructureExample(structure);
+    }
+  }
+
+  return buildResponseExample(returnsType);
+}
+
+export function generateApiDocumentationMarkdownV1(): string {
+  const sections: string[] = [];
+  const namespaceOrder: string[] = [];
+  const grouped = new Map<string, typeof BDS_PYTHON_API_CONTRACT_V1.methods>();
+
+  for (const method of BDS_PYTHON_API_CONTRACT_V1.methods) {
+    const [namespace] = method.method.split('.');
+    if (!namespace) {
+      continue;
+    }
+
+    if (!grouped.has(namespace)) {
+      grouped.set(namespace, []);
+      namespaceOrder.push(namespace);
+    }
+
+    grouped.get(namespace)?.push(method);
+  }
+
+  sections.push('# API Documentation');
+  sections.push('');
+  sections.push(`Contract version: ${BDS_PYTHON_API_CONTRACT_V1.version}`);
+  sections.push('');
+  sections.push('This reference documents all Python runtime API calls available through `bds_api` in embedded Pyodide.');
+  sections.push('');
+  sections.push('## Usage');
+  sections.push('');
+  sections.push('```python');
+  sections.push('from bds_api import bds');
+  sections.push('');
+  sections.push('# inside an async Python function in bDS runtime:');
+  sections.push("project = await bds.meta.get_project_metadata()");
+  sections.push('```');
+  sections.push('');
+  sections.push('## Table of contents');
+  sections.push('');
+
+  for (const namespace of namespaceOrder) {
+    const moduleAnchor = toDocumentationHeadingSlug(namespace);
+    sections.push(`- [${namespace}](#${moduleAnchor})`);
+  }
+
+  sections.push('- [Data Structures](#data-structures)');
+
+  for (const namespace of namespaceOrder) {
+    const namespaceMethods = grouped.get(namespace) ?? [];
+    sections.push('');
+    sections.push(`## ${namespace}`);
+    sections.push('');
+    sections.push('**Module APIs**');
+    sections.push('');
+
+    for (const method of namespaceMethods) {
+      const apiAnchor = toDocumentationHeadingSlug(method.method);
+      sections.push(`- [${method.method}](#${apiAnchor})`);
+    }
+
+    for (const method of namespaceMethods) {
+      const [, member] = method.method.split('.');
+      if (!member) {
+        continue;
+      }
+
+      sections.push('');
+      sections.push(`### ${method.method}`);
+      sections.push('');
+      sections.push(method.description);
+      sections.push('');
+      sections.push('**Parameters**');
+      sections.push('');
+
+      if (method.params.length === 0) {
+        sections.push('- None');
+      } else {
+        for (const param of method.params) {
+          const requiredState = param.required ? 'required' : 'optional';
+          sections.push(`- ${param.name} (${toPythonTypeName(param.type)}, ${requiredState})`);
+        }
+      }
+
+      sections.push('');
+      sections.push('**Response specification**');
+      sections.push('');
+      sections.push(`- Return type: \`${method.returns}\``);
+
+      if (method.returns.includes(' | null')) {
+        sections.push('- Nullability: Returns `None` when no matching value exists.');
+      }
+
+      const referencedStructures = extractDataStructureNames(method.returns);
+      if (referencedStructures.length > 0) {
+        sections.push(`- Data structures: ${referencedStructures.map((name) => `\`${name}\``).join(', ')}`);
+      }
+
+      sections.push('');
+      sections.push('**Example call**');
+      sections.push('');
+      sections.push('```python');
+      sections.push('from bds_api import bds');
+      sections.push(buildExampleCall(namespace, member, method.params));
+      sections.push('```');
+      sections.push('');
+      sections.push('**Example response**');
+      sections.push('');
+      sections.push('```python');
+      sections.push(buildResponseExampleWithStructure(method.returns));
+      sections.push('```');
+    }
+
+    sections.push('');
+    sections.push('[↑ Back to Table of contents](#table-of-contents)');
+  }
+
+  sections.push('');
+  sections.push('## Data Structures');
+  sections.push('');
+  sections.push('Shared structures referenced by response types are defined once here.');
+
+  for (const structure of BDS_PYTHON_API_CONTRACT_V1.dataStructures) {
+    sections.push('');
+    sections.push(`### ${structure.name}`);
+    sections.push('');
+    sections.push(structure.description);
+    sections.push('');
+    sections.push('**Fields**');
+    sections.push('');
+
+    for (const field of structure.fields) {
+      const requiredState = field.required ? 'required' : 'optional';
+      sections.push(`- ${field.name} (\`${field.type}\`, ${requiredState}): ${field.description}`);
+    }
+
+    sections.push('');
+    sections.push('[↑ Back to Table of contents](#table-of-contents)');
+  }
+
+  sections.push('');
+  sections.push('---');
+  sections.push('');
+  sections.push(`Generated from contract at ${BDS_PYTHON_API_CONTRACT_V1.generatedAt}.`);
+  sections.push('');
+
+  return `${sections.join('\n').trim()}\n`;
+}

src/renderer/python/generatePythonApiModuleV1.ts

@@ -0,0 +1,128 @@
+import { BDS_PYTHON_API_CONTRACT_V1 } from './pythonApiContractV1';
+
+function toSnakeCase(value: string): string {
+  return value
+    .replace(/([a-z0-9])([A-Z])/g, '$1_$2')
+    .replace(/[^a-zA-Z0-9]+/g, '_')
+    .replace(/^_+|_+$/g, '')
+    .toLowerCase();
+}
+
+function quotePython(value: string): string {
+  return value.replace(/\\/g, '\\\\').replace(/"/g, '\\"');
+}
+
+function buildPythonMethod(method: {
+  method: string;
+  description: string;
+  params: Array<{ name: string; required: boolean }>;
+}): string {
+  const [namespace, member] = method.method.split('.');
+  if (!namespace || !member) {
+    return '';
+  }
+
+  const pythonMethodName = toSnakeCase(member);
+  const pythonParams = method.params.map((param) => ({
+    sourceName: param.name,
+    pythonName: toSnakeCase(param.name),
+    required: param.required,
+  }));
+
+  const signature = pythonParams.length > 0
+    ? `, ${pythonParams.map((param) => (param.required ? param.pythonName : `${param.pythonName}=None`)).join(', ')}`
+    : '';
+
+  const argsDict = method.params.length > 0
+    ? `{ ${method.params.map((param, index) => `"${param.name}": ${pythonParams[index]?.pythonName}`).join(', ')} }`
+    : '{}';
+
+  return [
+    `    async def ${pythonMethodName}(self${signature}):`,
+    `        \"\"\"${quotePython(method.description)}\"\"\"`,
+    `        return await self._transport.call("${method.method}", ${argsDict})`,
+    '',
+  ].join('\n');
+}
+
+function buildPythonNamespaceClass(
+  namespace: string,
+  methods: Array<{ method: string; description: string; params: Array<{ name: string; required: boolean }> }>
+): string {
+  const className = `${namespace[0].toUpperCase()}${namespace.slice(1)}Api`;
+  const methodBlocks = methods.map((method) => buildPythonMethod(method)).join('');
+
+  return [
+    `class ${className}:`,
+    '    def __init__(self, transport):',
+    '        self._transport = transport',
+    '',
+    methodBlocks.trimEnd(),
+    '',
+  ].join('\n');
+}
+
+export function generatePythonApiModuleV1(): string {
+  const namespaceMap = new Map<string, Array<{ method: string; description: string; params: Array<{ name: string; required: boolean }> }>>();
+
+  for (const method of BDS_PYTHON_API_CONTRACT_V1.methods) {
+    const [namespace] = method.method.split('.');
+    if (!namespace) {
+      continue;
+    }
+
+    const entries = namespaceMap.get(namespace) ?? [];
+    entries.push({
+      method: method.method,
+      description: method.description,
+      params: method.params.map((param) => ({
+        name: param.name,
+        required: param.required,
+      })),
+    });
+    namespaceMap.set(namespace, entries);
+  }
+
+  const namespaceBlocks = Array.from(namespaceMap.entries())
+    .sort(([left], [right]) => left.localeCompare(right))
+    .map(([namespace, methods]) => buildPythonNamespaceClass(namespace, methods))
+    .join('\n');
+
+  const namespaceAssignments = Array.from(namespaceMap.keys())
+    .sort((left, right) => left.localeCompare(right))
+    .map((namespace) => `        self.${toSnakeCase(namespace)} = ${namespace[0].toUpperCase()}${namespace.slice(1)}Api(transport)`)
+    .join('\n');
+
+  return [
+    '# Auto-generated by generatePythonApiModuleV1.ts',
+    `# Contract version: ${BDS_PYTHON_API_CONTRACT_V1.version}`,
+    '',
+    'import json',
+    '',
+    'class BdsApiError(Exception):',
+    '    pass',
+    '',
+    namespaceBlocks.trimEnd(),
+    '',
+    'class BdsApi:',
+    '    def __init__(self, transport):',
+    '        self._transport = transport',
+    namespaceAssignments,
+    '',
+    'class _Transport:',
+    '    def __init__(self, call_impl):',
+    '        self._call_impl = call_impl',
+    '',
+    '    async def call(self, method, args):',
+    '        raw_result = await self._call_impl(method, json.dumps(args))',
+    '        if raw_result is None or raw_result == "":',
+    '            return None',
+    '        return json.loads(raw_result)',
+    '',
+    'def install_bds_api(call_impl):',
+    '    _transport = _Transport(call_impl)',
+    '    bds = BdsApi(_transport)',
+    '    return bds',
+    '',
+  ].join('\n');
+}

src/renderer/python/pythonApiContractV1.ts

@@ -0,0 +1,381 @@
+import type { ElectronAPI } from '../../main/shared/electronApi';
+
+type PythonPromiseMethodPath = {
+  [Group in keyof ElectronAPI]: ElectronAPI[Group] extends Record<string, (...args: never[]) => unknown>
+    ? {
+        [Method in keyof ElectronAPI[Group]]: ElectronAPI[Group][Method] extends (...args: never[]) => Promise<unknown>
+          ? `${Extract<Group, string>}.${Extract<Method, string>}`
+          : never;
+      }[keyof ElectronAPI[Group]]
+    : never;
+}[keyof ElectronAPI];
+
+export type PythonApiParamType = 'string' | 'number' | 'boolean' | 'object' | 'array' | 'any' | 'stringOrNull';
+
+export interface PythonApiParamContractV1 {
+  name: string;
+  type: PythonApiParamType;
+  required: boolean;
+}
+
+export interface PythonApiMethodContractV1 {
+  method: PythonPromiseMethodPath;
+  description: string;
+  params: PythonApiParamContractV1[];
+  returns: string;
+}
+
+export interface PythonApiDataStructureFieldContractV1 {
+  name: string;
+  type: string;
+  required: boolean;
+  description: string;
+}
+
+export interface PythonApiDataStructureContractV1 {
+  name: string;
+  description: string;
+  fields: PythonApiDataStructureFieldContractV1[];
+}
+
+export interface PythonApiContractV1 {
+  version: string;
+  generatedAt: string;
+  methods: PythonApiMethodContractV1[];
+  dataStructures: PythonApiDataStructureContractV1[];
+}
+
+const requiredString = (name: string): PythonApiParamContractV1 => ({ name, type: 'string', required: true });
+const optionalString = (name: string): PythonApiParamContractV1 => ({ name, type: 'string', required: false });
+const optionalNumber = (name: string): PythonApiParamContractV1 => ({ name, type: 'number', required: false });
+const requiredObject = (name: string): PythonApiParamContractV1 => ({ name, type: 'object', required: true });
+const optionalObject = (name: string): PythonApiParamContractV1 => ({ name, type: 'object', required: false });
+const requiredArray = (name: string): PythonApiParamContractV1 => ({ name, type: 'array', required: true });
+const requiredAny = (name: string): PythonApiParamContractV1 => ({ name, type: 'any', required: true });
+const requiredStringOrNull = (name: string): PythonApiParamContractV1 => ({ name, type: 'stringOrNull', required: true });
+
+function method(
+  methodName: PythonPromiseMethodPath,
+  description: string,
+  params: PythonApiParamContractV1[],
+  returns: string
+): PythonApiMethodContractV1 {
+  return {
+    method: methodName,
+    description,
+    params,
+    returns,
+  };
+}
+
+const METHODS_V1: PythonApiMethodContractV1[] = [
+  method('projects.create', 'Create a project.', [requiredObject('data')], 'ProjectData'),
+  method('projects.update', 'Update a project by id.', [requiredString('id'), requiredObject('data')], 'ProjectData | null'),
+  method('projects.delete', 'Delete a project by id.', [requiredString('id')], 'boolean'),
+  method('projects.deleteWithData', 'Delete a project and data by id.', [requiredString('id')], 'boolean'),
+  method('projects.get', 'Fetch one project by id.', [requiredString('id')], 'ProjectData | null'),
+  method('projects.getAll', 'Fetch all projects.', [], 'ProjectData[]'),
+  method('projects.getActive', 'Fetch active project.', [], 'ProjectData | null'),
+  method('projects.setActive', 'Set active project by id.', [requiredString('id')], 'ProjectData | null'),
+
+  method('posts.create', 'Create a post.', [requiredObject('data')], 'PostData'),
+  method('posts.update', 'Update a post by id.', [requiredString('id'), requiredObject('data')], 'PostData | null'),
+  method('posts.delete', 'Delete a post by id.', [requiredString('id')], 'boolean'),
+  method('posts.get', 'Fetch one post by id.', [requiredString('postId')], 'PostData | null'),
+  method('posts.getPreviewUrl', 'Get preview URL for post.', [requiredString('id'), optionalObject('options')], 'string | null'),
+  method('posts.getAll', 'Fetch posts with pagination.', [optionalObject('options')], 'PaginatedPostsResult'),
+  method('posts.getByStatus', 'Fetch posts by status.', [requiredString('status')], 'PostData[]'),
+  method('posts.publish', 'Publish a post by id.', [requiredString('id')], 'PostData | null'),
+  method('posts.discard', 'Discard draft changes for post.', [requiredString('id')], 'PostData | null'),
+  method('posts.hasPublishedVersion', 'Check if post has published version.', [requiredString('id')], 'boolean'),
+  method('posts.rebuildFromFiles', 'Rebuild posts database from files.', [], 'void'),
+  method('posts.reindexText', 'Reindex post search text.', [], 'void'),
+  method('posts.search', 'Search posts by free-text query.', [requiredString('query')], 'SearchResult[]'),
+  method('posts.filter', 'Filter posts by criteria.', [requiredObject('filter')], 'PostData[]'),
+  method('posts.getTags', 'Get all post tags.', [], 'string[]'),
+  method('posts.getCategories', 'Get all post categories.', [], 'string[]'),
+  method('posts.getByYearMonth', 'Get post counts grouped by year/month.', [], 'Array<{ year: number; month: number; count: number } >'),
+  method('posts.getDashboardStats', 'Get post dashboard stats.', [], 'DashboardStats'),
+  method('posts.getTagsWithCounts', 'Get post tags with counts.', [], 'TagCount[]'),
+  method('posts.getCategoriesWithCounts', 'Get post categories with counts.', [], 'CategoryCount[]'),
+  method('posts.getLinksTo', 'Get posts linked to given post.', [requiredString('id')], 'PostData[]'),
+  method('posts.getLinkedBy', 'Get posts linking to given post.', [requiredString('id')], 'PostData[]'),
+  method('posts.rebuildLinks', 'Rebuild post link graph.', [], 'void'),
+  method('posts.isSlugAvailable', 'Check if post slug is available.', [requiredString('slug'), optionalString('excludePostId')], 'boolean'),
+  method('posts.generateUniqueSlug', 'Generate unique slug from title.', [requiredString('title'), optionalString('excludePostId')], 'string'),
+
+  method('media.import', 'Import media file.', [requiredString('sourcePath'), optionalObject('metadata')], 'MediaData'),
+  method('media.update', 'Update media metadata by id.', [requiredString('id'), requiredObject('data')], 'MediaData | null'),
+  method('media.replaceFile', 'Replace media file by id.', [requiredString('id'), requiredString('newSourcePath')], 'MediaData | null'),
+  method('media.delete', 'Delete media by id.', [requiredString('id')], 'boolean'),
+  method('media.get', 'Fetch one media by id.', [requiredString('id')], 'MediaData | null'),
+  method('media.getUrl', 'Get media URL by id.', [requiredString('id')], 'string | null'),
+  method('media.getFilePath', 'Get media file path by id.', [requiredString('id')], 'string | null'),
+  method('media.getAll', 'Fetch all media.', [], 'MediaData[]'),
+  method('media.rebuildFromFiles', 'Rebuild media database from files.', [], 'void'),
+  method('media.reindexText', 'Reindex media search text.', [], 'void'),
+  method('media.getThumbnail', 'Get media thumbnail URL.', [requiredString('id'), optionalString('size')], 'string | null'),
+  method('media.regenerateThumbnails', 'Regenerate thumbnails for media.', [requiredString('id')], 'Record<string, string> | null'),
+  method('media.regenerateMissingThumbnails', 'Regenerate all missing thumbnails.', [], '{ processed: number; generated: number; failed: number }'),
+  method('media.filter', 'Filter media by criteria.', [requiredObject('filter')], 'MediaData[]'),
+  method('media.search', 'Search media by free-text query.', [requiredString('query')], 'MediaSearchResult[]'),
+  method('media.getByYearMonth', 'Get media counts grouped by year/month.', [], 'Array<{ year: number; month: number; count: number } >'),
+  method('media.getTags', 'Get all media tags.', [], 'string[]'),
+  method('media.getTagsWithCounts', 'Get media tags with counts.', [], 'TagCount[]'),
+
+  method('scripts.create', 'Create script.', [requiredObject('data')], 'ScriptData'),
+  method('scripts.update', 'Update script by id.', [requiredString('id'), requiredObject('data')], 'ScriptData | null'),
+  method('scripts.delete', 'Delete script by id.', [requiredString('id')], 'boolean'),
+  method('scripts.get', 'Fetch script by id.', [requiredString('id')], 'ScriptData | null'),
+  method('scripts.getAll', 'Fetch all scripts.', [], 'ScriptData[]'),
+  method('scripts.rebuildFromFiles', 'Rebuild scripts from files.', [], 'void'),
+
+  method('tasks.getAll', 'Fetch all tasks.', [], 'TaskProgress[]'),
+  method('tasks.getRunning', 'Fetch running tasks.', [], 'TaskProgress[]'),
+  method('tasks.cancel', 'Cancel task by id.', [requiredString('taskId')], 'boolean'),
+  method('tasks.clearCompleted', 'Clear completed tasks.', [], 'void'),
+
+  method('app.getDataPaths', 'Get app data paths.', [], '{ database: string; posts: string; media: string }'),
+  method('app.getSystemLanguage', 'Get system language.', [], 'string'),
+  method('app.getTitleBarMetrics', 'Get title bar metrics.', [], '{ macosLeftInset: number } | null'),
+  method('app.openFolder', 'Open folder in system file manager.', [requiredString('folderPath')], 'string'),
+  method('app.showItemInFolder', 'Reveal item in system file manager.', [requiredString('itemPath')], 'void'),
+  method('app.selectFolder', 'Show folder picker dialog.', [optionalString('title')], 'string | null'),
+  method('app.getDefaultProjectPath', 'Get default project path.', [requiredString('projectId')], 'string'),
+  method('app.readProjectMetadata', 'Read project metadata from path.', [requiredString('folderPath')], '{ name?: string; description?: string; publicUrl?: string; mainLanguage?: string } | null'),
+  method('app.getBlogmarkBookmarklet', 'Get blogmark bookmarklet script.', [], 'string'),
+  method('app.copyToClipboard', 'Copy text to clipboard.', [requiredString('text')], 'boolean'),
+  method('app.notifyRendererReady', 'Notify main process renderer is ready.', [], 'boolean'),
+  method('app.setPreviewPostTarget', 'Set preview post target.', [requiredStringOrNull('postId')], 'void'),
+  method('app.triggerMenuAction', 'Trigger menu action.', [requiredString('action')], 'void'),
+
+  method('meta.getTags', 'Get project tags.', [], 'string[]'),
+  method('meta.getCategories', 'Get project categories.', [], 'string[]'),
+  method('meta.addTag', 'Add project tag.', [requiredString('tag')], 'string[]'),
+  method('meta.removeTag', 'Remove project tag.', [requiredString('tag')], 'string[]'),
+  method('meta.addCategory', 'Add project category.', [requiredString('category')], 'string[]'),
+  method('meta.removeCategory', 'Remove project category.', [requiredString('category')], 'string[]'),
+  method('meta.syncOnStartup', 'Sync meta values on startup.', [], '{ tags: string[]; categories: string[]; projectMetadata: ProjectMetadata | null }'),
+  method('meta.getProjectMetadata', 'Read active project metadata.', [], 'ProjectMetadata | null'),
+  method('meta.setProjectMetadata', 'Set project metadata.', [requiredObject('metadata')], 'ProjectMetadata | null'),
+  method('meta.updateProjectMetadata', 'Update project metadata.', [requiredObject('updates')], 'ProjectMetadata | null'),
+
+  method('tags.getAll', 'Fetch all tags.', [], 'TagData[]'),
+  method('tags.getWithCounts', 'Fetch tags with counts.', [], 'TagWithCount[]'),
+  method('tags.get', 'Fetch tag by id.', [requiredString('id')], 'TagData | null'),
+  method('tags.getByName', 'Fetch tag by name.', [requiredString('name')], 'TagData | null'),
+  method('tags.create', 'Create tag.', [requiredObject('data')], 'TagData'),
+  method('tags.update', 'Update tag by id.', [requiredString('id'), requiredObject('data')], 'TagData | null'),
+  method('tags.delete', 'Delete tag by id.', [requiredString('id')], 'DeleteTagResult'),
+  method('tags.merge', 'Merge tags into target tag.', [requiredArray('sourceTagIds'), requiredString('targetTagId')], 'MergeTagsResult'),
+  method('tags.rename', 'Rename tag by id.', [requiredString('id'), requiredString('newName')], 'RenameTagResult'),
+  method('tags.getPostsWithTag', 'Get posts using a tag.', [requiredString('tagId')], 'string[]'),
+  method('tags.syncFromPosts', 'Sync tag index from posts.', [], 'SyncTagsResult'),
+
+  method('chat.checkReady', 'Check chat backend readiness.', [], 'ChatReadyStatus'),
+  method('chat.validateApiKey', 'Validate chat API key and list available models.', [requiredString('apiKey')], '{ isValid: boolean; models: ChatModel[] }'),
+  method('chat.setApiKey', 'Store chat API key.', [requiredString('apiKey')], '{ success: boolean; error?: string }'),
+  method('chat.getApiKey', 'Get stored chat API key status.', [], 'ChatApiKeyStatus'),
+  method('chat.getAvailableModels', 'Get available chat models and selected default.', [], '{ success: boolean; models?: ChatModel[]; selectedModel?: string; error?: string }'),
+  method('chat.setDefaultModel', 'Set default chat model.', [requiredString('modelId')], '{ success: boolean; error?: string }'),
+  method('chat.getSystemPrompt', 'Get configured system prompt.', [], '{ success: boolean; prompt?: string; error?: string }'),
+  method('chat.setSystemPrompt', 'Set system prompt.', [requiredString('prompt')], '{ success: boolean; error?: string }'),
+  method('chat.getConversations', 'Fetch all chat conversations.', [], 'ChatConversation[]'),
+  method('chat.createConversation', 'Create a chat conversation.', [optionalString('title'), optionalString('model')], 'ChatConversation'),
+  method('chat.getConversation', 'Fetch one chat conversation by id.', [requiredString('id')], 'ChatConversation | null'),
+  method('chat.updateConversation', 'Update chat conversation metadata.', [requiredString('id'), requiredObject('updates')], 'ChatConversation | null'),
+  method('chat.deleteConversation', 'Delete chat conversation by id.', [requiredString('id')], 'boolean'),
+  method('chat.sendMessage', 'Send message to chat conversation.', [requiredString('conversationId'), requiredString('message')], '{ success: boolean; message?: string; error?: string }'),
+  method('chat.abortMessage', 'Abort active streaming chat response.', [requiredString('conversationId')], 'void'),
+  method('chat.getHistory', 'Get message history for conversation.', [requiredString('conversationId')], 'ChatMessage[]'),
+  method('chat.clearMessages', 'Clear messages for conversation.', [requiredString('conversationId')], 'void'),
+  method('chat.setConversationModel', 'Set model for a conversation.', [requiredString('conversationId'), requiredString('modelId')], 'void'),
+  method('chat.analyzeTaxonomy', 'Analyze categories and tags using AI.', [requiredArray('categories'), requiredArray('tags'), requiredString('modelId')], '{ success: boolean; categoryMappings?: Record<string, string>; tagMappings?: Record<string, string>; error?: string }'),
+  method('chat.analyzeMediaImage', 'Analyze media image and propose metadata.', [requiredString('mediaId'), optionalString('language')], '{ success: boolean; title?: string; alt?: string; caption?: string; error?: string }'),
+
+  method('sync.configure', 'Configure sync.', [requiredObject('config')], 'void'),
+  method('sync.start', 'Start sync operation.', [optionalString('direction')], 'SyncResult'),
+  method('sync.getStatus', 'Get sync status.', [], "'idle' | 'syncing' | 'error'"),
+  method('sync.isConfigured', 'Check if sync is configured.', [], 'boolean'),
+  method('sync.getPendingCount', 'Get pending sync item count.', [], '{ posts: number; media: number }'),
+  method('sync.getLog', 'Get sync log.', [optionalNumber('limit')], 'unknown[]'),
+  method('sync.stopAutoSync', 'Stop automatic sync.', [], 'void'),
+];
+
+const DATA_STRUCTURES_V1: PythonApiDataStructureContractV1[] = [
+  {
+    name: 'ProjectData',
+    description: 'Project metadata stored in the app database.',
+    fields: [
+      { name: 'id', type: 'string', required: true, description: 'Unique project identifier.' },
+      { name: 'name', type: 'string', required: true, description: 'Human-readable project name.' },
+      { name: 'slug', type: 'string', required: true, description: 'URL-friendly project slug.' },
+      { name: 'description', type: 'string', required: false, description: 'Optional project description.' },
+      { name: 'dataPath', type: 'string', required: false, description: 'Filesystem path for project data.' },
+      { name: 'isActive', type: 'boolean', required: true, description: 'Whether this project is currently active.' },
+      { name: 'createdAt', type: 'string', required: true, description: 'Creation timestamp (ISO string).' },
+      { name: 'updatedAt', type: 'string', required: true, description: 'Last update timestamp (ISO string).' },
+    ],
+  },
+  {
+    name: 'PostData',
+    description: 'Canonical post object used across editor and generation flows.',
+    fields: [
+      { name: 'id', type: 'string', required: true, description: 'Unique post identifier.' },
+      { name: 'projectId', type: 'string', required: true, description: 'Owning project id.' },
+      { name: 'title', type: 'string', required: true, description: 'Post title.' },
+      { name: 'slug', type: 'string', required: true, description: 'URL slug used for generated routes.' },
+      { name: 'excerpt', type: 'string', required: false, description: 'Optional short summary.' },
+      { name: 'content', type: 'string', required: true, description: 'Markdown body content.' },
+      { name: 'status', type: "'draft' | 'published' | 'archived'", required: true, description: 'Publication lifecycle state.' },
+      { name: 'author', type: 'string', required: false, description: 'Optional author name.' },
+      { name: 'createdAt', type: 'string', required: true, description: 'Creation timestamp (ISO string).' },
+      { name: 'updatedAt', type: 'string', required: true, description: 'Last update timestamp (ISO string).' },
+      { name: 'publishedAt', type: 'string', required: false, description: 'Publication timestamp for published posts.' },
+      { name: 'tags', type: 'string[]', required: true, description: 'List of tag names.' },
+      { name: 'categories', type: 'string[]', required: true, description: 'List of category names.' },
+    ],
+  },
+  {
+    name: 'MediaData',
+    description: 'Canonical media object representing imported files and metadata.',
+    fields: [
+      { name: 'id', type: 'string', required: true, description: 'Unique media identifier.' },
+      { name: 'projectId', type: 'string', required: true, description: 'Owning project id.' },
+      { name: 'filename', type: 'string', required: true, description: 'Stored filename in project media folder.' },
+      { name: 'originalName', type: 'string', required: true, description: 'Original imported filename.' },
+      { name: 'mimeType', type: 'string', required: true, description: 'Detected MIME type.' },
+      { name: 'size', type: 'number', required: true, description: 'File size in bytes.' },
+      { name: 'width', type: 'number', required: false, description: 'Image width in pixels when available.' },
+      { name: 'height', type: 'number', required: false, description: 'Image height in pixels when available.' },
+      { name: 'title', type: 'string', required: false, description: 'Optional display title.' },
+      { name: 'alt', type: 'string', required: false, description: 'Optional alternative text.' },
+      { name: 'caption', type: 'string', required: false, description: 'Optional caption text.' },
+      { name: 'author', type: 'string', required: false, description: 'Optional author credit.' },
+      { name: 'createdAt', type: 'string', required: true, description: 'Creation timestamp (ISO string).' },
+      { name: 'updatedAt', type: 'string', required: true, description: 'Last update timestamp (ISO string).' },
+      { name: 'tags', type: 'string[]', required: true, description: 'List of media tags.' },
+    ],
+  },
+  {
+    name: 'ScriptData',
+    description: 'Script definition for Python macros, utilities, and transforms.',
+    fields: [
+      { name: 'id', type: 'string', required: true, description: 'Unique script identifier.' },
+      { name: 'projectId', type: 'string', required: true, description: 'Owning project id.' },
+      { name: 'slug', type: 'string', required: true, description: 'Stable script slug.' },
+      { name: 'title', type: 'string', required: true, description: 'Human-readable script title.' },
+      { name: 'kind', type: "'macro' | 'utility' | 'transform'", required: true, description: 'Script category.' },
+      { name: 'entrypoint', type: 'string', required: true, description: 'Python entrypoint function name.' },
+      { name: 'enabled', type: 'boolean', required: true, description: 'Whether script is enabled.' },
+      { name: 'version', type: 'number', required: true, description: 'Incrementing script version.' },
+      { name: 'filePath', type: 'string', required: true, description: 'Filesystem path to script file.' },
+      { name: 'content', type: 'string', required: true, description: 'Script source code.' },
+      { name: 'createdAt', type: 'string', required: true, description: 'Creation timestamp (ISO string).' },
+      { name: 'updatedAt', type: 'string', required: true, description: 'Last update timestamp (ISO string).' },
+    ],
+  },
+  {
+    name: 'TaskProgress',
+    description: 'Task queue status object for long-running operations.',
+    fields: [
+      { name: 'taskId', type: 'string', required: true, description: 'Unique task identifier.' },
+      { name: 'name', type: 'string', required: true, description: 'Task display name.' },
+      { name: 'status', type: "'pending' | 'running' | 'completed' | 'failed' | 'cancelled'", required: true, description: 'Current task status.' },
+      { name: 'progress', type: 'number', required: true, description: 'Progress percentage from 0-100.' },
+      { name: 'message', type: 'string', required: true, description: 'Current progress message.' },
+      { name: 'startTime', type: 'string', required: true, description: 'Task start time (ISO string).' },
+      { name: 'endTime', type: 'string', required: false, description: 'Task completion time (ISO string).' },
+      { name: 'error', type: 'string', required: false, description: 'Error message when failed.' },
+      { name: 'groupId', type: 'string', required: false, description: 'Optional grouping id.' },
+      { name: 'groupName', type: 'string', required: false, description: 'Optional grouping label.' },
+    ],
+  },
+  {
+    name: 'ProjectMetadata',
+    description: 'Extended project metadata from project settings.',
+    fields: [
+      { name: 'name', type: 'string', required: true, description: 'Project display name.' },
+      { name: 'description', type: 'string', required: false, description: 'Optional project description.' },
+      { name: 'dataPath', type: 'string', required: false, description: 'Optional custom data path.' },
+      { name: 'publicUrl', type: 'string', required: false, description: 'Optional public site URL.' },
+      { name: 'mainLanguage', type: 'string', required: false, description: 'Main render language code.' },
+      { name: 'defaultAuthor', type: 'string', required: false, description: 'Default author for new posts.' },
+      { name: 'maxPostsPerPage', type: 'number', required: false, description: 'Pagination size for generated lists.' },
+      { name: 'blogmarkCategory', type: 'string', required: false, description: 'Default category for blogmark imports.' },
+      { name: 'pythonRuntimeMode', type: "'webworker' | 'main-thread'", required: false, description: 'Python runtime execution mode.' },
+      { name: 'picoTheme', type: 'string', required: false, description: 'Preferred Pico theme token.' },
+      { name: 'categoryMetadata', type: 'object', required: false, description: 'Category metadata keyed by category slug.' },
+      { name: 'categorySettings', type: 'object', required: false, description: 'Category render settings keyed by category slug.' },
+    ],
+  },
+  {
+    name: 'ChatConversation',
+    description: 'Chat conversation container.',
+    fields: [
+      { name: 'id', type: 'string', required: true, description: 'Unique conversation identifier.' },
+      { name: 'title', type: 'string', required: true, description: 'Conversation title.' },
+      { name: 'model', type: 'string', required: false, description: 'Optional model id used by this conversation.' },
+      { name: 'createdAt', type: 'string', required: true, description: 'Creation timestamp (ISO string).' },
+      { name: 'updatedAt', type: 'string', required: true, description: 'Last update timestamp (ISO string).' },
+    ],
+  },
+  {
+    name: 'ChatMessage',
+    description: 'Single message entry in a conversation history.',
+    fields: [
+      { name: 'id', type: 'string', required: true, description: 'Unique message identifier.' },
+      { name: 'conversationId', type: 'string', required: true, description: 'Owning conversation id.' },
+      { name: 'role', type: "'user' | 'assistant' | 'system' | 'tool'", required: true, description: 'Message author role.' },
+      { name: 'content', type: 'string', required: true, description: 'Message text content.' },
+      { name: 'toolCallId', type: 'string', required: false, description: 'Tool call id when associated with tool output.' },
+      { name: 'toolCalls', type: 'string', required: false, description: 'Serialized tool call payload when present.' },
+      { name: 'createdAt', type: 'string', required: true, description: 'Creation timestamp (ISO string).' },
+    ],
+  },
+  {
+    name: 'ChatModel',
+    description: 'Available chat model descriptor.',
+    fields: [
+      { name: 'id', type: 'string', required: true, description: 'Model identifier.' },
+      { name: 'name', type: 'string', required: true, description: 'Human-readable model name.' },
+      { name: 'provider', type: 'string', required: false, description: 'Model provider name.' },
+    ],
+  },
+  {
+    name: 'ChatReadyStatus',
+    description: 'Chat backend readiness status.',
+    fields: [
+      { name: 'ready', type: 'boolean', required: true, description: 'Whether chat backend is ready.' },
+      { name: 'error', type: 'string', required: false, description: 'Error description when not ready.' },
+      { name: 'backend', type: 'string', required: false, description: 'Selected backend identifier.' },
+    ],
+  },
+  {
+    name: 'ChatApiKeyStatus',
+    description: 'Stored API key state for chat provider.',
+    fields: [
+      { name: 'hasKey', type: 'boolean', required: true, description: 'Whether a key is configured.' },
+      { name: 'maskedKey', type: 'string', required: true, description: 'Masked key representation for UI display.' },
+    ],
+  },
+];
+
+export const BDS_PYTHON_API_CONTRACT_V1: PythonApiContractV1 = {
+  version: '1.3.0',
+  generatedAt: '2026-02-24T00:00:00.000Z',
+  methods: METHODS_V1,
+  dataStructures: DATA_STRUCTURES_V1,
+};
+
+export function listPythonApiMethodNames(): string[] {
+  return BDS_PYTHON_API_CONTRACT_V1.methods.map((entry) => entry.method);
+}
+
+export function getPythonApiMethodContract(methodName: string): PythonApiMethodContractV1 | undefined {
+  return BDS_PYTHON_API_CONTRACT_V1.methods.find((entry) => entry.method === methodName);
+}
+
+export function getPythonApiDataStructureContracts(): PythonApiDataStructureContractV1[] {
+  return BDS_PYTHON_API_CONTRACT_V1.dataStructures;
+}

src/renderer/python/pythonApiInvokerV1.ts

@@ -0,0 +1,102 @@
+import { getPythonApiMethodContract, type PythonApiParamContractV1 } from './pythonApiContractV1';
+
+function asRecord(value: unknown): Record<string, unknown> {
+  if (!value || typeof value !== 'object' || Array.isArray(value)) {
+    return {};
+  }
+  return value as Record<string, unknown>;
+}
+
+function getElectronApi(): Window['electronAPI'] {
+  if (typeof window === 'undefined' || !window.electronAPI) {
+    throw new Error('electronAPI is not available in renderer context');
+  }
+  return window.electronAPI;
+}
+
+function validateParamValue(methodName: string, param: PythonApiParamContractV1, value: unknown): void {
+  if (param.type === 'stringOrNull') {
+    if (value === null || (typeof value === 'string' && value.length > 0)) {
+      return;
+    }
+    throw new Error(`${methodName} requires stringOrNull arg ${param.name}`);
+  }
+
+  if (value === undefined || value === null) {
+    if (!param.required) {
+      return;
+    }
+    throw new Error(`${methodName} requires ${param.type} arg ${param.name}`);
+  }
+
+  if (param.type === 'any') {
+    return;
+  }
+
+  if (param.type === 'string') {
+    if (typeof value === 'string' && value.length > 0) {
+      return;
+    }
+    throw new Error(`${methodName} requires string arg ${param.name}`);
+  }
+
+  if (param.type === 'number') {
+    if (typeof value === 'number' && Number.isFinite(value)) {
+      return;
+    }
+    throw new Error(`${methodName} requires number arg ${param.name}`);
+  }
+
+  if (param.type === 'boolean') {
+    if (typeof value === 'boolean') {
+      return;
+    }
+    throw new Error(`${methodName} requires boolean arg ${param.name}`);
+  }
+
+  if (param.type === 'array') {
+    if (Array.isArray(value)) {
+      return;
+    }
+    throw new Error(`${methodName} requires array arg ${param.name}`);
+  }
+
+  if (param.type === 'object') {
+    if (typeof value === 'object' && value !== null && !Array.isArray(value)) {
+      return;
+    }
+    throw new Error(`${methodName} requires object arg ${param.name}`);
+  }
+}
+
+export async function invokePythonApiMethodV1(method: string, args: unknown): Promise<unknown> {
+  const contract = getPythonApiMethodContract(method);
+  if (!contract) {
+    throw new Error(`Unsupported Python API method: ${method}`);
+  }
+
+  const normalizedArgs = asRecord(args);
+  const electronApi = getElectronApi();
+  const [namespace, member] = contract.method.split('.');
+  if (!namespace || !member) {
+    throw new Error(`Unsupported Python API method: ${method}`);
+  }
+
+  const namespaceRecord = (electronApi as unknown as Record<string, unknown>)[namespace];
+  if (!namespaceRecord || typeof namespaceRecord !== 'object') {
+    throw new Error(`Unsupported Python API namespace: ${namespace}`);
+  }
+
+  const callable = (namespaceRecord as Record<string, unknown>)[member];
+  if (typeof callable !== 'function') {
+    throw new Error(`Unsupported Python API method: ${method}`);
+  }
+
+  const orderedArgs = contract.params.map((param) => {
+    const value = normalizedArgs[param.name];
+    validateParamValue(contract.method, param, value);
+    return value;
+  });
+
+  return (callable as (...values: unknown[]) => Promise<unknown>)(...orderedArgs);
+}

src/renderer/python/pythonRuntime.worker.ts

@@ -3,9 +3,19 @@ import type { PythonWorkerMessage, PythonWorkerRequest } from './runtimeProtocol
 import { parseMacroContextV1, parseMacroResultV1 } from './abiV1';
 import { resolvePyodideIndexURL } from './pyodideAssetUrl';
 import { runPythonSyntaxCheck } from './pythonSyntaxCheck';
+import { generatePythonApiModuleV1 } from './generatePythonApiModuleV1';
 
 let runtime: PyodideInterface | null = null;
 let activeRequestId: string | null = null;
+let apiCallCounter = 0;
+
+interface PendingApiCall {
+  requestId: string;
+  resolve: (value: unknown) => void;
+  reject: (error: Error) => void;
+}
+
+const pendingApiCalls = new Map<string, PendingApiCall>();
 
 function postRuntimeMessage(message: PythonWorkerMessage): void {
   self.postMessage(message);
@@ -21,6 +31,64 @@ function toResultString(result: unknown): string {
   return String(result);
 }
 
+function toRecord(value: unknown): Record<string, unknown> {
+  if (!value || typeof value !== 'object' || Array.isArray(value)) {
+    return {};
+  }
+  return value as Record<string, unknown>;
+}
+
+function rejectPendingApiCallsForRequest(requestId: string, message: string): void {
+  for (const [callId, pendingCall] of pendingApiCalls.entries()) {
+    if (pendingCall.requestId !== requestId) {
+      continue;
+    }
+    pendingApiCalls.delete(callId);
+    pendingCall.reject(new Error(message));
+  }
+}
+
+function requestHostApi(requestId: string, method: string, args: Record<string, unknown>): Promise<unknown> {
+  apiCallCounter += 1;
+  const callId = `api-${apiCallCounter}`;
+
+  return new Promise((resolve, reject) => {
+    pendingApiCalls.set(callId, {
+      requestId,
+      resolve,
+      reject,
+    });
+
+    postRuntimeMessage({
+      type: 'apiCall',
+      requestId,
+      callId,
+      method,
+      args,
+    });
+  });
+}
+
+function handleApiResultMessage(request: PythonWorkerRequest): void {
+  if (request.type !== 'apiResult') {
+    return;
+  }
+
+  const pendingCall = pendingApiCalls.get(request.callId);
+  if (!pendingCall) {
+    return;
+  }
+
+  pendingApiCalls.delete(request.callId);
+
+  if (request.ok) {
+    pendingCall.resolve(request.result);
+    return;
+  }
+
+  pendingCall.reject(new Error(request.error ?? 'Host API call failed'));
+}
+
 async function runPythonCode(code: string, cacheKey?: string): Promise<unknown> {
   if (!runtime) {
     throw new Error('Python runtime is not ready');
@@ -83,9 +151,11 @@ __bds_target()
       result: toResultString(result),
     });
   } catch (error) {
+    rejectPendingApiCallsForRequest(request.requestId, 'Python script execution failed');
     const message = error instanceof Error ? error.message : String(error);
     postRuntimeMessage({ type: 'runError', requestId: request.requestId, error: message });
   } finally {
+    rejectPendingApiCallsForRequest(request.requestId, 'Python script execution finished');
     activeRequestId = null;
   }
 }
@@ -125,9 +195,11 @@ json.dumps(render(__bds_context_v1))
       result: parsedResult,
     });
   } catch (error) {
+    rejectPendingApiCallsForRequest(request.requestId, 'Python macro execution failed');
     const message = error instanceof Error ? error.message : String(error);
     postRuntimeMessage({ type: 'runError', requestId: request.requestId, error: message });
   } finally {
+    rejectPendingApiCallsForRequest(request.requestId, 'Python macro execution finished');
     activeRequestId = null;
   }
 }
@@ -175,9 +247,11 @@ json.dumps(__bds_entrypoints)
       entrypoints,
     });
   } catch (error) {
+    rejectPendingApiCallsForRequest(request.requestId, 'Entrypoint inspection failed');
     const message = error instanceof Error ? error.message : String(error);
     postRuntimeMessage({ type: 'runError', requestId: request.requestId, error: message });
   } finally {
+    rejectPendingApiCallsForRequest(request.requestId, 'Entrypoint inspection finished');
     activeRequestId = null;
   }
 }
@@ -208,9 +282,11 @@ async function syntaxCheck(request: PythonWorkerRequest): Promise<void> {
       errors,
     });
   } catch (error) {
+    rejectPendingApiCallsForRequest(request.requestId, 'Syntax check failed');
     const message = error instanceof Error ? error.message : String(error);
     postRuntimeMessage({ type: 'runError', requestId: request.requestId, error: message });
   } finally {
+    rejectPendingApiCallsForRequest(request.requestId, 'Syntax check finished');
     activeRequestId = null;
   }
 }
@@ -230,6 +306,41 @@ async function bootstrapRuntime(): Promise<void> {
     if (!runtime) {
       throw new Error('Pyodide initialization returned no runtime');
     }
+
+    runtime.registerJsModule('__bds_transport', {
+      call_host_api: async (method: unknown, argsJson: unknown) => {
+        if (!activeRequestId) {
+          throw new Error('No active Python request for host API bridge');
+        }
+
+        if (typeof method !== 'string' || method.length === 0) {
+          throw new Error('Host API method must be a non-empty string');
+        }
+
+        let parsedArgs: Record<string, unknown> = {};
+        if (typeof argsJson === 'string' && argsJson.length > 0) {
+          const decoded = JSON.parse(argsJson);
+          parsedArgs = toRecord(decoded);
+        }
+
+        const result = await requestHostApi(activeRequestId, method, parsedArgs);
+        return JSON.stringify(result ?? null);
+      },
+    });
+
+    runtime.globals.set('__bds_api_module_source', generatePythonApiModuleV1());
+    await runtime.runPythonAsync(`
+import sys
+import types
+
+__bds_api_module = types.ModuleType("bds_api")
+exec(__bds_api_module_source, __bds_api_module.__dict__)
+
+from __bds_transport import call_host_api as __bds_call_host_api
+__bds_api_module.bds = __bds_api_module.install_bds_api(__bds_call_host_api)
+sys.modules["bds_api"] = __bds_api_module
+`);
+
     postRuntimeMessage({ type: 'ready' });
   } catch (error) {
     const message = error instanceof Error ? error.message : String(error);
@@ -239,6 +350,11 @@ async function bootstrapRuntime(): Promise<void> {
 
 self.onmessage = (event: MessageEvent<PythonWorkerRequest>) => {
   const request = event.data;
+  if (request.type === 'apiResult') {
+    handleApiResultMessage(request);
+    return;
+  }
+
   if (request.type === 'run') {
     void runScript(request);
     return;

src/renderer/python/runtimeProtocol.ts

@@ -8,6 +8,14 @@ export type PythonWorkerRequest =
       cacheKey?: string;
       entrypoint?: string;
     }
+  | {
+      type: 'apiResult';
+      requestId: string;
+      callId: string;
+      ok: boolean;
+      result?: unknown;
+      error?: string;
+    }
   | {
       type: 'renderMacroV1';
       requestId: string;
@@ -40,6 +48,7 @@ export type PythonWorkerMessage =
   | { type: 'ready' }
   | { type: 'error'; error: string }
   | { type: 'stdout'; requestId: string; chunk: string }
+  | { type: 'apiCall'; requestId: string; callId: string; method: string; args: Record<string, unknown> }
   | { type: 'runResult'; requestId: string; result: string }
   | { type: 'entrypoints'; requestId: string; entrypoints: string[] }
   | { type: 'syntaxResult'; requestId: string; errors: PythonSyntaxError[] }

src/renderer/store/appStore.ts

@@ -13,7 +13,7 @@ import type {
 const STORAGE_KEY = 'bds-app-state';
 
 // Tab types
-export type TabType = 'post' | 'media' | 'settings' | 'style' | 'tags' | 'chat' | 'import' | 'menu-editor' | 'metadata-diff' | 'git-diff' | 'documentation' | 'site-validation' | 'scripts';
+export type TabType = 'post' | 'media' | 'settings' | 'style' | 'tags' | 'chat' | 'import' | 'menu-editor' | 'metadata-diff' | 'git-diff' | 'documentation' | 'api-documentation' | 'site-validation' | 'scripts';
 
 export interface Tab {
   type: TabType;

tests/engine/PackagingConfig.test.ts

@@ -52,4 +52,28 @@ describe('package.json packaging configuration', () => {
     expect(dependencies.uuid).toBeTypeOf('string');
     expect(devDependencies.uuid).toBeUndefined();
   });
+
+  it('copies API documentation into packaged app resources', () => {
+    const build = packageJson.build as Record<string, any>;
+    const extraResources = build.extraResources as Array<{ from: string; to: string }>;
+
+    expect(Array.isArray(extraResources)).toBe(true);
+    expect(extraResources).toEqual(expect.arrayContaining([
+      expect.objectContaining({
+        from: 'API.md',
+      }),
+    ]));
+  });
+
+  it('copies user documentation into packaged app resources', () => {
+    const build = packageJson.build as Record<string, any>;
+    const extraResources = build.extraResources as Array<{ from: string; to: string }>;
+
+    expect(Array.isArray(extraResources)).toBe(true);
+    expect(extraResources).toEqual(expect.arrayContaining([
+      expect.objectContaining({
+        from: 'DOCUMENTATION.md',
+      }),
+    ]));
+  });
 });

tests/renderer/menuCommands.test.ts

@@ -13,6 +13,17 @@ describe('Help menu documentation entry', () => {
     expect(APP_MENU_ACTION_EVENT_MAP.openDocumentation).toBe('menu:openDocumentation');
   });
 
+  it('includes an API documentation action in Help menu', () => {
+    const helpGroup = APP_MENU_GROUPS.find((group) => group.label === 'Help');
+
+    expect(helpGroup).toBeDefined();
+    expect(helpGroup?.items.some((item) => item.action === 'openApiDocumentation')).toBe(true);
+  });
+
+  it('maps API documentation to a renderer menu event', () => {
+    expect(APP_MENU_ACTION_EVENT_MAP.openApiDocumentation).toBe('menu:openApiDocumentation');
+  });
+
   it('includes Open in Browser and Open Data Folder actions in File menu', () => {
     const fileGroup = APP_MENU_GROUPS.find((group) => group.label === 'File');
 

tests/renderer/navigation/editorRouting.test.ts

@@ -19,6 +19,7 @@ describe('editorRouting', () => {
       'metadata-diff': 'metadata-diff',
       'git-diff': 'git-diff',
       documentation: 'documentation',
+      'api-documentation': 'api-documentation',
       'site-validation': 'site-validation',
       scripts: 'scripts',
     });

tests/renderer/python/PythonRuntimeManager.test.ts

@@ -421,4 +421,85 @@ describe('PythonRuntimeManager', () => {
 
     await expect(runPromise).rejects.toThrow('Invalid macro result');
   });
+
+  it('handles worker apiCall by invoking host bridge and returning apiResult', async () => {
+    const worker = new MockWorker();
+    const invokeApiCall = vi.fn().mockResolvedValue({ id: 'post-1', title: 'Hello' });
+    const manager = new PythonRuntimeManager(
+      () => worker as unknown as Worker,
+      {
+        invokeApiCall,
+      }
+    );
+
+    const initPromise = manager.initialize();
+    worker.emitMessage({ type: 'ready' });
+    await initPromise;
+
+    const runPromise = manager.execute('print("hello")');
+    await Promise.resolve();
+
+    const runRequest = worker.postedMessages[0] as { requestId: string };
+    worker.emitMessage({
+      type: 'apiCall',
+      requestId: runRequest.requestId,
+      callId: 'call-1',
+      method: 'posts.get',
+      args: { postId: 'post-1' },
+    });
+
+    await Promise.resolve();
+
+    expect(invokeApiCall).toHaveBeenCalledWith('posts.get', { postId: 'post-1' });
+    expect(worker.postedMessages[1]).toEqual({
+      type: 'apiResult',
+      requestId: runRequest.requestId,
+      callId: 'call-1',
+      ok: true,
+      result: { id: 'post-1', title: 'Hello' },
+    });
+
+    worker.emitMessage({ type: 'runResult', requestId: runRequest.requestId, result: 'done' });
+    await expect(runPromise).resolves.toEqual({ result: 'done', stdout: '' });
+  });
+
+  it('returns apiResult with error when host bridge invocation fails', async () => {
+    const worker = new MockWorker();
+    const invokeApiCall = vi.fn().mockRejectedValue(new Error('unknown api method'));
+    const manager = new PythonRuntimeManager(
+      () => worker as unknown as Worker,
+      {
+        invokeApiCall,
+      }
+    );
+
+    const initPromise = manager.initialize();
+    worker.emitMessage({ type: 'ready' });
+    await initPromise;
+
+    const runPromise = manager.execute('print("hello")');
+    await Promise.resolve();
+
+    const runRequest = worker.postedMessages[0] as { requestId: string };
+    worker.emitMessage({
+      type: 'apiCall',
+      requestId: runRequest.requestId,
+      callId: 'call-2',
+      method: 'posts.nonExisting',
+      args: {},
+    });
+
+    await Promise.resolve();
+
+    expect(worker.postedMessages[1]).toEqual({
+      type: 'apiResult',
+      requestId: runRequest.requestId,
+      callId: 'call-2',
+      ok: false,
+      error: 'unknown api method',
+    });
+
+    worker.emitMessage({ type: 'runResult', requestId: runRequest.requestId, result: 'done' });
+    await expect(runPromise).resolves.toEqual({ result: 'done', stdout: '' });
+  });
 });

tests/renderer/python/apiDocumentationSync.test.ts

@@ -0,0 +1,14 @@
+import { describe, expect, it } from 'vitest';
+import { readFileSync } from 'node:fs';
+import { resolve } from 'node:path';
+import { generateApiDocumentationMarkdownV1 } from '../../../src/renderer/python/generateApiDocumentationMarkdownV1';
+
+describe('API documentation markdown sync', () => {
+  it('matches generated contract documentation', () => {
+    const apiMarkdownPath = resolve(process.cwd(), 'API.md');
+    const committedMarkdown = readFileSync(apiMarkdownPath, 'utf8');
+    const generatedMarkdown = generateApiDocumentationMarkdownV1();
+
+    expect(committedMarkdown).toBe(generatedMarkdown);
+  });
+});

tests/renderer/python/generateApiDocumentationMarkdownV1.test.ts

@@ -0,0 +1,60 @@
+import { describe, expect, it } from 'vitest';
+import { generateApiDocumentationMarkdownV1 } from '../../../src/renderer/python/generateApiDocumentationMarkdownV1';
+
+describe('generateApiDocumentationMarkdownV1', () => {
+  it('includes a top-level table of contents with module jump links', () => {
+    const markdown = generateApiDocumentationMarkdownV1();
+
+    expect(markdown).toContain('## Table of contents');
+    expect(markdown).toContain('- [projects](#projects)');
+    expect(markdown).toContain('- [posts](#posts)');
+    expect(markdown).toContain('- [media](#media)');
+    expect(markdown).toContain('- [Data Structures](#data-structures)');
+  });
+
+  it('includes per-module API sub-table of contents with endpoint jump links', () => {
+    const markdown = generateApiDocumentationMarkdownV1();
+
+    expect(markdown).toContain('**Module APIs**');
+    expect(markdown).toContain('- [projects.create](#projectscreate)');
+    expect(markdown).toContain('- [posts.getAll](#postsgetall)');
+    expect(markdown).toContain('- [media.import](#mediaimport)');
+  });
+
+  it('includes quick links back to top navigation sections', () => {
+    const markdown = generateApiDocumentationMarkdownV1();
+
+    expect(markdown).toContain('[↑ Back to Table of contents](#table-of-contents)');
+  });
+
+  it('documents chat APIs in a dedicated module section', () => {
+    const markdown = generateApiDocumentationMarkdownV1();
+
+    expect(markdown).toContain('## chat');
+    expect(markdown).toContain('### chat.getConversations');
+    expect(markdown).toContain('### chat.sendMessage');
+    expect(markdown).toContain('- [chat](#chat)');
+    expect(markdown).toContain('- [chat.sendMessage](#chatsendmessage)');
+  });
+
+  it('includes a dedicated Data Structures section with core object shapes', () => {
+    const markdown = generateApiDocumentationMarkdownV1();
+
+    expect(markdown).toContain('## Data Structures');
+    expect(markdown).toContain('### PostData');
+    expect(markdown).toContain('- id (`string`, required)');
+    expect(markdown).toContain('- title (`string`, required)');
+    expect(markdown).toContain('- content (`string`, required)');
+    expect(markdown).toContain('### MediaData');
+    expect(markdown).toContain('- filename (`string`, required)');
+    expect(markdown).toContain('- mimeType (`string`, required)');
+  });
+
+  it('documents return type details in the response section', () => {
+    const markdown = generateApiDocumentationMarkdownV1();
+
+    expect(markdown).toContain('**Response specification**');
+    expect(markdown).toContain('- Return type: `PostData | null`');
+    expect(markdown).toContain('- Return type: `MediaData[]`');
+  });
+});

tests/renderer/python/pythonApiContractV1.test.ts

@@ -0,0 +1,81 @@
+import { describe, expect, it } from 'vitest';
+import {
+  BDS_PYTHON_API_CONTRACT_V1,
+  getPythonApiMethodContract,
+  listPythonApiMethodNames,
+} from '../../../src/renderer/python/pythonApiContractV1';
+import { generatePythonApiModuleV1 } from '../../../src/renderer/python/generatePythonApiModuleV1';
+
+describe('pythonApiContractV1', () => {
+  it('exposes broad stable method names for v1 contract', () => {
+    const methodNames = listPythonApiMethodNames();
+
+    expect(methodNames.length).toBeGreaterThan(40);
+    expect(methodNames).toEqual(expect.arrayContaining([
+      'projects.getAll',
+      'posts.get',
+      'posts.getAll',
+      'posts.search',
+      'media.get',
+      'media.search',
+      'meta.getProjectMetadata',
+      'tags.getAll',
+      'scripts.getAll',
+      'tasks.getAll',
+      'app.getSystemLanguage',
+      'chat.getConversations',
+      'chat.sendMessage',
+    ]));
+  });
+
+  it('returns method contract metadata by name', () => {
+    expect(getPythonApiMethodContract('posts.get')).toEqual({
+      method: 'posts.get',
+      description: 'Fetch one post by id.',
+      params: [
+        {
+          name: 'postId',
+          type: 'string',
+          required: true,
+        },
+      ],
+      returns: 'PostData | null',
+    });
+  });
+
+  it('contains semantic version metadata for compatibility checks', () => {
+    expect(BDS_PYTHON_API_CONTRACT_V1).toMatchObject({
+      version: '1.3.0',
+      generatedAt: expect.any(String),
+    });
+  });
+
+  it('includes canonical data structures for response documentation', () => {
+    expect(BDS_PYTHON_API_CONTRACT_V1.dataStructures).toEqual(expect.arrayContaining([
+      expect.objectContaining({ name: 'PostData' }),
+      expect.objectContaining({ name: 'MediaData' }),
+      expect.objectContaining({ name: 'ProjectData' }),
+    ]));
+  });
+});
+
+describe('generatePythonApiModuleV1', () => {
+  it('generates python facade that hides transport details', () => {
+    const moduleCode = generatePythonApiModuleV1();
+
+    expect(moduleCode).toContain('class BdsApiError(Exception):');
+    expect(moduleCode).toContain('class ProjectsApi:');
+    expect(moduleCode).toContain('class PostsApi:');
+    expect(moduleCode).toContain('class MediaApi:');
+    expect(moduleCode).toContain('class MetaApi:');
+    expect(moduleCode).toContain('class ChatApi:');
+    expect(moduleCode).toContain('async def get(self, post_id):');
+    expect(moduleCode).toContain('async def get_all(self, options=None):');
+    expect(moduleCode).toContain('async def search(self, query):');
+    expect(moduleCode).toContain('async def get_project_metadata(self):');
+    expect(moduleCode).toContain('async def get_conversations(self):');
+    expect(moduleCode).toContain('async def send_message(self, conversation_id, message):');
+    expect(moduleCode).toContain('class BdsApi:');
+    expect(moduleCode).toContain('bds = BdsApi(_transport)');
+  });
+});

tests/renderer/python/pythonApiInvokerV1.test.ts

@@ -0,0 +1,80 @@
+import { afterEach, describe, expect, it, vi } from 'vitest';
+import { invokePythonApiMethodV1 } from '../../../src/renderer/python/pythonApiInvokerV1';
+
+describe('invokePythonApiMethodV1', () => {
+  afterEach(() => {
+    vi.unstubAllGlobals();
+  });
+
+  it('invokes posts.get via electronAPI with validated args', async () => {
+    const getPost = vi.fn().mockResolvedValue({ id: 'p1', title: 'Post 1' });
+
+    vi.stubGlobal('window', {
+      electronAPI: {
+        posts: {
+          get: getPost,
+        },
+      },
+    });
+
+    await expect(invokePythonApiMethodV1('posts.get', { postId: 'p1' })).resolves.toEqual({
+      id: 'p1',
+      title: 'Post 1',
+    });
+    expect(getPost).toHaveBeenCalledWith('p1');
+  });
+
+  it('invokes methods from multiple namespaces via contract metadata', async () => {
+    const searchPosts = vi.fn().mockResolvedValue([{ id: 'p1', title: 'Hit' }]);
+    const getProjectMetadata = vi.fn().mockResolvedValue({ name: 'My Project' });
+    const getAllProjects = vi.fn().mockResolvedValue([{ id: 'prj-1', name: 'Main' }]);
+    const getAllPosts = vi.fn().mockResolvedValue({ items: [], hasMore: false, total: 0 });
+
+    vi.stubGlobal('window', {
+      electronAPI: {
+        projects: {
+          getAll: getAllProjects,
+        },
+        posts: {
+          search: searchPosts,
+          getAll: getAllPosts,
+        },
+        meta: {
+          getProjectMetadata,
+        },
+      },
+    });
+
+    await expect(invokePythonApiMethodV1('projects.getAll', {})).resolves.toEqual([{ id: 'prj-1', name: 'Main' }]);
+    await expect(invokePythonApiMethodV1('posts.getAll', { options: { limit: 10, offset: 5 } })).resolves.toEqual({ items: [], hasMore: false, total: 0 });
+    await expect(invokePythonApiMethodV1('posts.search', { query: 'hit' })).resolves.toEqual([{ id: 'p1', title: 'Hit' }]);
+    await expect(invokePythonApiMethodV1('meta.getProjectMetadata', {})).resolves.toEqual({ name: 'My Project' });
+    expect(getAllProjects).toHaveBeenCalledWith();
+    expect(getAllPosts).toHaveBeenCalledWith({ limit: 10, offset: 5 });
+    expect(searchPosts).toHaveBeenCalledWith('hit');
+    expect(getProjectMetadata).toHaveBeenCalledWith();
+  });
+
+  it('rejects unknown methods and malformed args', async () => {
+    vi.stubGlobal('window', {
+      electronAPI: {
+        posts: {
+          get: vi.fn(),
+          search: vi.fn(),
+          getAll: vi.fn(),
+        },
+        projects: {
+          getAll: vi.fn(),
+        },
+        meta: {
+          getProjectMetadata: vi.fn(),
+        },
+      },
+    });
+
+    await expect(invokePythonApiMethodV1('posts.unknown', {})).rejects.toThrow('Unsupported Python API method');
+    await expect(invokePythonApiMethodV1('posts.get', {})).rejects.toThrow('posts.get requires string arg postId');
+    await expect(invokePythonApiMethodV1('posts.search', { query: 1 })).rejects.toThrow('posts.search requires string arg query');
+    await expect(invokePythonApiMethodV1('posts.getAll', { options: 1 })).rejects.toThrow('posts.getAll requires object arg options');
+  });
+});