fix: MCP servers — broken INSERT into dropped type column, stale content refs

The previous schema sync (86f43c9) was incomplete — it renamed variables
but left the SQL statements writing to `type` and `content` columns that
no longer exist in the schema. Fresh installs crash on first node create.

nodeService.js:
- Remove `type` from INSERT/UPDATE, replace with `event_date`
- Fix `content` → `notes` in INSERT values and UPDATE SET clauses
- Add `sanitizeTitle()` and chunk fallback logic

sqlite-client.js:
- Remove `is_pinned` from CREATE TABLE
- Add `description` and `icon` to dimensions table

index.js:
- Add temporal filter fields to search schema
- Improved description prompts
- Dynamic date injection in instructions

server.js + stdio-server.js:
- Add content→notes mapping in update handlers
- Fix output returning `notes` instead of `content`
- Add extraction tool schemas and handlers

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/mcp-server-standalone/index.js

@@ -40,25 +40,31 @@ const serverInfo = {
   version: '1.4.1'
 };
 
-const instructions = [
+function buildInstructions() {
-  "RA-H is the user's personal knowledge graph — local SQLite, fully on-device.",
+  const now = new Date().toISOString().split('T')[0];
-  'Call rah_get_context first for a quick orientation (stats, hubs, dimensions).',
+  return [
-  'For simple tasks (add a node, search), the tool descriptions have everything you need — just execute.',
+    `Today's date: ${now}.`,
-  'For complex or ambiguous tasks, also call rah_read_guide("start-here") for full graph understanding.',
+    "RA-H is the user's personal knowledge graph — local SQLite, fully on-device.",
-  'Knowledge capture: after substantive exchanges, offer to save valuable information.',
+    'Call rah_get_context first for a quick orientation (stats, hubs, dimensions).',
-  'Triggers: a new insight emerges, a decision is made, a person/entity/concept is discussed in depth, research or references are shared, a connection to existing knowledge surfaces.',
+    'For simple tasks (add a node, search), the tool descriptions have everything you need — just execute.',
-  'When offering, propose a specific node — title, dimensions, one-line description — so the user can approve with minimal friction.',
+    'For complex or ambiguous tasks, also call rah_read_guide("start-here") for full graph understanding.',
-  'Don\'t ask "should I save this?" — instead say "I\'d add this as: [title] in [dimensions] — want me to?"',
+    'Knowledge capture: after substantive exchanges, offer to save valuable information.',
-  'Search before creating to avoid duplicates.',
+    'Triggers: a new insight emerges, a decision is made, a person/entity/concept is discussed in depth, research or references are shared, a connection to existing knowledge surfaces.',
-  'All data stays on this device.'
+    'When offering, propose a specific node — title, dimensions, and a concrete description (WHAT it is + WHY it matters, no vague "discusses/explores") — so the user can approve with minimal friction.',
-].join(' ');
+    'Don\'t ask "should I save this?" — instead say "I\'d add this as: [title] in [dimensions] — want me to?"',
+    'Search before creating to avoid duplicates.',
+    'All data stays on this device.'
+  ].join(' ');
+}
+
+const instructions = buildInstructions();
 
 // Tool schemas
 const addNodeInputSchema = {
   title: z.string().min(1).max(160).describe('Clear, descriptive title'),
   content: z.string().max(20000).optional().describe('Node content/notes'),
   link: z.string().url().optional().describe('Source URL'),
-  description: z.string().max(2000).optional().describe('One-sentence summary. Helps search and AI understanding.'),
+  description: z.string().max(2000).optional().describe('One-sentence summary: WHAT this is (explicit, concrete) + WHY it matters. No weak verbs (discusses, explores, examines). Example: "Podcast — Lex Fridman interviews Sam Altman on AGI timelines. First public comments since board drama."'),
   dimensions: z.array(z.string()).min(1).max(5).describe('1-5 categories. Call rah_list_dimensions first to use existing ones.'),
   metadata: z.record(z.any()).optional().describe('Additional metadata'),
   chunk: z.string().max(50000).optional().describe('Full source text')
@@ -67,7 +73,11 @@ const addNodeInputSchema = {
 const searchNodesInputSchema = {
   query: z.string().min(1).max(400).describe('Search query'),
   limit: z.number().min(1).max(25).optional().describe('Max results (default 10)'),
-  dimensions: z.array(z.string()).max(5).optional().describe('Filter by dimensions')
+  dimensions: z.array(z.string()).max(5).optional().describe('Filter by dimensions'),
+  created_after: z.string().optional().describe('ISO date (YYYY-MM-DD). Only return nodes created on or after this date.'),
+  created_before: z.string().optional().describe('ISO date (YYYY-MM-DD). Only return nodes created before this date.'),
+  event_after: z.string().optional().describe('ISO date (YYYY-MM-DD). Only return nodes with event_date on or after this date.'),
+  event_before: z.string().optional().describe('ISO date (YYYY-MM-DD). Only return nodes with event_date before this date.')
 };
 
 const getNodesInputSchema = {
@@ -300,6 +310,7 @@ async function main() {
     {
       title: 'Add RA-H node',
       description: 'Create a new node. Always search first (rah_search_nodes) to avoid duplicates. Title: max 160 chars, clear and descriptive. Use "link" ONLY for external content (URL, video, article) — omit for synthesis/ideas derived from existing nodes. "content" = your notes/analysis. "chunk" = verbatim source text. "description" = one-sentence summary for search. Assign 1-5 dimensions — call rah_list_dimensions first to use existing ones.',
+      // Note: MCP schema uses "content" for external API compat; mapped to "notes" internally
       inputSchema: addNodeInputSchema
     },
     async ({ title, content, link, description, dimensions, metadata, chunk }) => {
@@ -337,14 +348,24 @@ async function main() {
     {
       title: 'Search RA-H nodes',
       description: 'Search nodes by keyword across title, description, and content fields. Multi-word queries find nodes containing all words (not exact phrases). Returns up to 25 results (default 10). Call before creating nodes to check for duplicates. Optionally filter by dimensions.',
+      // Note: searches across title, description, and notes columns
       inputSchema: searchNodesInputSchema
     },
-    async ({ query: searchQuery, limit = 10, dimensions }) => {
+    async ({ query: searchQuery, limit = 10, dimensions, created_after, created_before, event_after, event_before }) => {
       const normalizedDimensions = sanitizeDimensions(dimensions || []);
       const safeLimit = Math.min(Math.max(limit, 1), 25);
       const trimmedQuery = searchQuery.trim();
       const fts = checkFtsAvailability();
 
+      // Build temporal filter clauses
+      const temporalClauses = [];
+      const temporalParams = [];
+      if (created_after) { temporalClauses.push('n.created_at >= ?'); temporalParams.push(created_after); }
+      if (created_before) { temporalClauses.push('n.created_at < ?'); temporalParams.push(created_before); }
+      if (event_after) { temporalClauses.push('n.event_date >= ?'); temporalParams.push(event_after); }
+      if (event_before) { temporalClauses.push('n.event_date < ?'); temporalParams.push(event_before); }
+      const temporalSQL = temporalClauses.length > 0 ? temporalClauses.map(c => `AND ${c}`).join(' ') : '';
+
       let nodes = null;
 
       // Try FTS5 first (handles multi-word queries naturally)
@@ -359,7 +380,8 @@ async function main() {
                 WITH fts_matches AS (
                   SELECT rowid, rank FROM nodes_fts WHERE nodes_fts MATCH ? LIMIT 100
                 )
-                SELECT n.id, n.title, n.description, n.notes, n.link, n.updated_at,
+                SELECT n.id, n.title, n.description, n.notes, n.link,
+                       n.created_at, n.updated_at, n.event_date,
                        COALESCE((SELECT JSON_GROUP_ARRAY(d.dimension)
                                  FROM node_dimensions d WHERE d.node_id = n.id), '[]') as dimensions_json
                 FROM fts_matches fm
@@ -369,23 +391,26 @@ async function main() {
                   WHERE nd.node_id = n.id
                   AND nd.dimension IN (${normalizedDimensions.map(() => '?').join(',')})
                 )
+                ${temporalSQL}
                 ORDER BY fm.rank
                 LIMIT ?
               `;
-              params = [ftsQuery, ...normalizedDimensions, safeLimit];
+              params = [ftsQuery, ...normalizedDimensions, ...temporalParams, safeLimit];
             } else {
               sql = `
                 WITH fts_matches AS (
                   SELECT rowid, rank FROM nodes_fts WHERE nodes_fts MATCH ? LIMIT ?
                 )
-                SELECT n.id, n.title, n.description, n.notes, n.link, n.updated_at,
+                SELECT n.id, n.title, n.description, n.notes, n.link,
+                       n.created_at, n.updated_at, n.event_date,
                        COALESCE((SELECT JSON_GROUP_ARRAY(d.dimension)
                                  FROM node_dimensions d WHERE d.node_id = n.id), '[]') as dimensions_json
                 FROM fts_matches fm
                 JOIN nodes n ON n.id = fm.rowid
+                ${temporalSQL ? 'WHERE ' + temporalClauses.join(' AND ') : ''}
                 ORDER BY fm.rank
               `;
-              params = [ftsQuery, safeLimit];
+              params = [ftsQuery, safeLimit, ...temporalParams];
             }
 
             const rows = query(sql, params);
@@ -396,7 +421,9 @@ async function main() {
               description: row.description ?? null,
               link: row.link ?? null,
               dimensions: JSON.parse(row.dimensions_json || '[]'),
-              updated_at: row.updated_at
+              created_at: row.created_at,
+              updated_at: row.updated_at,
+              event_date: row.event_date ?? null
             }));
           } catch (err) {
             log('FTS search failed, falling back to LIKE:', err.message);
@@ -410,7 +437,8 @@ async function main() {
         const words = trimmedQuery.split(/\s+/).filter(w => w.length > 0);
 
         let sql = `
-          SELECT n.id, n.title, n.description, n.notes, n.link, n.updated_at,
+          SELECT n.id, n.title, n.description, n.notes, n.link,
+                 n.created_at, n.updated_at, n.event_date,
                  COALESCE((SELECT JSON_GROUP_ARRAY(d.dimension)
                            FROM node_dimensions d WHERE d.node_id = n.id), '[]') as dimensions_json
           FROM nodes n
@@ -432,6 +460,12 @@ async function main() {
           params.push(...normalizedDimensions);
         }
 
+        // Temporal filters
+        if (temporalSQL) {
+          sql += ` ${temporalSQL}`;
+          params.push(...temporalParams);
+        }
+
         sql += ` ORDER BY n.updated_at DESC LIMIT ?`;
         params.push(safeLimit);
 
@@ -443,7 +477,9 @@ async function main() {
           description: row.description ?? null,
           link: row.link ?? null,
           dimensions: JSON.parse(row.dimensions_json || '[]'),
-          updated_at: row.updated_at
+          created_at: row.created_at,
+          updated_at: row.updated_at,
+          event_date: row.event_date ?? null
         }));
       }
 
@@ -493,7 +529,9 @@ async function main() {
             chunk_length: rawChunk ? rawChunk.length : 0,
             dimensions: node.dimensions || [],
             metadata: node.metadata ?? null,
-            updated_at: node.updated_at
+            created_at: node.created_at,
+            updated_at: node.updated_at,
+            event_date: node.event_date ?? null
           });
         }
       }
@@ -512,7 +550,7 @@ async function main() {
     'rah_update_node',
     {
       title: 'Update RA-H node',
-      description: 'Update an existing node. Content is APPENDED to existing content (not replaced). Dimensions are REPLACED entirely with the new array. Title, description, and link are overwritten.',
+      description: 'Update an existing node. Content is APPENDED to existing notes (not replaced). Dimensions are REPLACED entirely with the new array. Title, description, and link are overwritten.',
       inputSchema: updateNodeInputSchema
     },
     async ({ id, updates }) => {
@@ -520,12 +558,13 @@ async function main() {
         throw new Error('At least one field must be provided in updates.');
       }
 
-      // Map external 'content' param to internal 'notes'
+      // Map MCP 'content' field → internal 'notes' field
       const mappedUpdates = { ...updates };
       if (mappedUpdates.content !== undefined) {
         mappedUpdates.notes = mappedUpdates.content;
         delete mappedUpdates.content;
       }
+
       const node = nodeService.updateNode(id, mappedUpdates, { appendNotes: true });
 
       return {

apps/mcp-server-standalone/services/nodeService.js

@@ -90,38 +90,61 @@ function getNodeById(id) {
   };
 }
 
+/**
+ * Sanitize title — strip extraction artifacts.
+ */
+function sanitizeTitle(title) {
+  let clean = title.trim();
+  if (clean.startsWith('Title: ')) clean = clean.slice(7);
+  if (clean.endsWith(' / X')) clean = clean.slice(0, -4);
+  clean = clean.replace(/\s+/g, ' ');
+  return clean.slice(0, 160);
+}
+
 /**
  * Create a new node.
  */
 function createNode(nodeData) {
   const {
-    title,
+    title: rawTitle,
     description,
     notes,
     link,
-    type,
+    event_date,
     dimensions = [],
     chunk,
     metadata = {}
   } = nodeData;
 
+  const title = sanitizeTitle(rawTitle);
+
   const now = new Date().toISOString();
   const db = getDb();
 
+  // Build chunk fallback from available fields when no explicit chunk provided
+  let chunkToStore = chunk ?? null;
+  if (!chunkToStore || !chunkToStore.trim()) {
+    const fallbackParts = [title, description, notes].filter(Boolean);
+    const fallback = fallbackParts.join('\n\n').trim();
+    if (fallback) {
+      chunkToStore = fallback;
+    }
+  }
+
   const nodeId = transaction(() => {
     const stmt = db.prepare(`
-      INSERT INTO nodes (title, description, notes, link, type, metadata, chunk, created_at, updated_at)
+      INSERT INTO nodes (title, description, notes, link, event_date, metadata, chunk, created_at, updated_at)
       VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
     `);
 
     const result = stmt.run(
       title,
       description ?? null,
-      content ?? null,
+      notes ?? null,
       link ?? null,
-      type ?? null,
+      event_date ?? null,
       JSON.stringify(metadata),
-      chunk ?? null,
+      chunkToStore,
       now,
       now
     );
@@ -146,11 +169,11 @@ function createNode(nodeData) {
 
 /**
  * Update an existing node.
- * Note: content is APPENDED by default (MCP tool behavior), not replaced.
+ * Note: notes is APPENDED by default (MCP tool behavior), not replaced.
  */
 function updateNode(id, updates, options = {}) {
   const { appendNotes = true } = options;
-  const { title, description, notes, link, type, dimensions, chunk, metadata } = updates;
+  const { title, description, notes, link, event_date, dimensions, chunk, metadata } = updates;
   const now = new Date().toISOString();
   const db = getDb();
 
@@ -172,23 +195,23 @@ function updateNode(id, updates, options = {}) {
       setFields.push('description = ?');
       params.push(description);
     }
-    if (content !== undefined) {
+    if (notes !== undefined) {
       if (appendNotes && existing.notes) {
-        // Append to existing content
+        // Append to existing notes
-        setFields.push('content = ?');
+        setFields.push('notes = ?');
-        params.push(existing.notes + '\n\n' + content);
+        params.push(existing.notes + '\n\n' + notes);
       } else {
-        setFields.push('content = ?');
+        setFields.push('notes = ?');
-        params.push(content);
+        params.push(notes);
       }
     }
     if (link !== undefined) {
       setFields.push('link = ?');
       params.push(link);
     }
-    if (type !== undefined) {
+    if (event_date !== undefined) {
-      setFields.push('type = ?');
+      setFields.push('event_date = ?');
-      params.push(type);
+      params.push(event_date);
     }
     if (chunk !== undefined) {
       setFields.push('chunk = ?');

apps/mcp-server-standalone/services/sqlite-client.js

@@ -60,8 +60,7 @@ function initDatabase() {
         embedding BLOB,
         embedding_updated_at TEXT,
         embedding_text TEXT,
-        chunk_status TEXT DEFAULT 'not_chunked',
+        chunk_status TEXT DEFAULT 'not_chunked'
-        is_pinned INTEGER DEFAULT 0
       );
 
       CREATE TABLE IF NOT EXISTS edges (
@@ -71,7 +70,6 @@ function initDatabase() {
         source TEXT,
         created_at TEXT,
         context TEXT,
-        
         FOREIGN KEY (from_node_id) REFERENCES nodes(id) ON DELETE CASCADE,
         FOREIGN KEY (to_node_id) REFERENCES nodes(id) ON DELETE CASCADE
       );
@@ -89,6 +87,8 @@ function initDatabase() {
 
       CREATE TABLE IF NOT EXISTS dimensions (
         name TEXT PRIMARY KEY,
+        description TEXT,
+        icon TEXT,
         is_priority INTEGER DEFAULT 0,
         updated_at TEXT DEFAULT CURRENT_TIMESTAMP
       );

apps/mcp-server/server.js

@@ -446,9 +446,16 @@ mcpServer.registerTool(
       throw new McpError(ErrorCode.InvalidParams, 'At least one field must be provided in updates.');
     }
 
+    // Map MCP 'content' field → internal 'notes' field
+    const mappedUpdates = { ...updates };
+    if (mappedUpdates.content !== undefined) {
+      mappedUpdates.notes = mappedUpdates.content;
+      delete mappedUpdates.content;
+    }
+
     const result = await callRaHApi(`/api/nodes/${id}`, {
       method: 'PUT',
-      body: JSON.stringify(updates)
+      body: JSON.stringify(mappedUpdates)
     });
 
     const node = result.node || result.data;
@@ -485,7 +492,7 @@ mcpServer.registerTool(
           nodes.push({
             id: result.node.id,
             title: result.node.title,
-            content: result.node.content ?? null,
+            notes: result.node.notes ?? null,
             link: result.node.link ?? null,
             dimensions: result.node.dimensions || [],
             updated_at: result.node.updated_at

apps/mcp-server/stdio-server.js

@@ -10,9 +10,12 @@ const { StdioServerTransport } = require('@modelcontextprotocol/sdk/server/stdio
 const packageJson = require('../../package.json');
 
 const instructions = [
-  'Use rah.add_node to summarize conversations or files into nodes with dimensions.',
+  'RA-H is a personal knowledge graph — local-first, vendor-neutral.',
-  'Use rah.search_nodes to recall prior notes before you suggest creating new ones.',
+  'Core concepts: nodes (knowledge units), edges (connections with explanations), dimensions (categories).',
-  'All operations happen locally on this device; data never leaves 127.0.0.1.'
+  'Always call rah_get_context first to orient yourself — it returns hub nodes, dimensions, stats, and available guides.',
+  'Search before creating: use rah_search_nodes to check if content already exists.',
+  'Every edge needs an explanation: why does this connection exist?',
+  'All data stays local on this device; nothing leaves 127.0.0.1.',
 ].join(' ');
 
 const serverInfo = {
@@ -202,6 +205,45 @@ const searchEmbeddingsOutputSchema = {
   )
 };
 
+// rah_extract_url schemas
+const extractUrlInputSchema = {
+  url: z.string().url().describe('URL of the webpage to extract content from')
+};
+
+const extractUrlOutputSchema = {
+  success: z.boolean(),
+  title: z.string(),
+  content: z.string(),
+  chunk: z.string(),
+  metadata: z.record(z.any())
+};
+
+// rah_extract_youtube schemas
+const extractYoutubeInputSchema = {
+  url: z.string().describe('YouTube video URL to extract transcript from')
+};
+
+const extractYoutubeOutputSchema = {
+  success: z.boolean(),
+  title: z.string(),
+  channel: z.string(),
+  transcript: z.string(),
+  metadata: z.record(z.any())
+};
+
+// rah_extract_pdf schemas
+const extractPdfInputSchema = {
+  url: z.string().url().describe('URL of the PDF file to extract content from')
+};
+
+const extractPdfOutputSchema = {
+  success: z.boolean(),
+  title: z.string(),
+  content: z.string(),
+  chunk: z.string(),
+  metadata: z.record(z.any())
+};
+
 const server = new McpServer(serverInfo, { instructions });
 
 function logError(...args) {
@@ -375,9 +417,16 @@ server.registerTool(
       throw new Error('At least one field must be provided in updates.');
     }
 
+    // Map MCP 'content' field → internal 'notes' field
+    const mappedUpdates = { ...updates };
+    if (mappedUpdates.content !== undefined) {
+      mappedUpdates.notes = mappedUpdates.content;
+      delete mappedUpdates.content;
+    }
+
     const result = await callRaHApi(`/api/nodes/${id}`, {
       method: 'PUT',
-      body: JSON.stringify(updates)
+      body: JSON.stringify(mappedUpdates)
     });
 
     const node = result.node || result.data;
@@ -414,7 +463,7 @@ server.registerTool(
           nodes.push({
             id: result.node.id,
             title: result.node.title,
-            content: result.node.content ?? null,
+            notes: result.node.notes ?? null,
             link: result.node.link ?? null,
             dimensions: result.node.dimensions || [],
             updated_at: result.node.updated_at
@@ -655,6 +704,171 @@ server.registerTool(
   }
 );
 
+server.registerTool(
+  'rah_extract_url',
+  {
+    title: 'Extract URL content',
+    description: 'Extract content from a webpage URL. Returns title, content, and metadata for creating nodes.',
+    inputSchema: extractUrlInputSchema,
+    outputSchema: extractUrlOutputSchema
+  },
+  async ({ url }) => {
+    const result = await callRaHApi('/api/extract/url', {
+      method: 'POST',
+      body: JSON.stringify({ url })
+    });
+
+    const summary = `Extracted content from: ${result.title || 'webpage'}`;
+    return {
+      content: [{ type: 'text', text: summary }],
+      structuredContent: {
+        success: true,
+        title: result.title || 'Untitled',
+        content: result.content || '',
+        chunk: result.chunk || '',
+        metadata: result.metadata || {}
+      }
+    };
+  }
+);
+
+server.registerTool(
+  'rah_extract_youtube',
+  {
+    title: 'Extract YouTube transcript',
+    description: 'Extract transcript from a YouTube video. Returns title, channel, transcript, and metadata.',
+    inputSchema: extractYoutubeInputSchema,
+    outputSchema: extractYoutubeOutputSchema
+  },
+  async ({ url }) => {
+    const result = await callRaHApi('/api/extract/youtube', {
+      method: 'POST',
+      body: JSON.stringify({ url })
+    });
+
+    const summary = `Extracted transcript from: ${result.title || 'YouTube video'}`;
+    return {
+      content: [{ type: 'text', text: summary }],
+      structuredContent: {
+        success: true,
+        title: result.title || 'Untitled',
+        channel: result.channel || 'Unknown',
+        transcript: result.transcript || '',
+        metadata: result.metadata || {}
+      }
+    };
+  }
+);
+
+server.registerTool(
+  'rah_extract_pdf',
+  {
+    title: 'Extract PDF content',
+    description: 'Extract content from a PDF file URL. Returns title, content, and metadata for creating nodes.',
+    inputSchema: extractPdfInputSchema,
+    outputSchema: extractPdfOutputSchema
+  },
+  async ({ url }) => {
+    const result = await callRaHApi('/api/extract/pdf', {
+      method: 'POST',
+      body: JSON.stringify({ url })
+    });
+
+    const summary = `Extracted content from: ${result.title || 'PDF document'}`;
+    return {
+      content: [{ type: 'text', text: summary }],
+      structuredContent: {
+        success: true,
+        title: result.title || 'Untitled PDF',
+        content: result.content || '',
+        chunk: result.chunk || '',
+        metadata: result.metadata || {}
+      }
+    };
+  }
+);
+
+// rah_get_context — orientation tool for external agents
+const getContextOutputSchema = {
+  schema: z.object({
+    nodeCount: z.number(),
+    edgeCount: z.number(),
+    dimensionCount: z.number()
+  }),
+  hubNodes: z.array(z.object({
+    id: z.number(),
+    title: z.string(),
+    description: z.string().nullable(),
+    edgeCount: z.number()
+  })),
+  dimensions: z.array(z.object({
+    name: z.string(),
+    nodeCount: z.number(),
+    description: z.string().nullable()
+  })),
+  guides: z.array(z.string())
+};
+
+server.registerTool(
+  'rah_get_context',
+  {
+    title: 'Get RA-H context',
+    description: 'Get orientation context: hub nodes, dimensions, stats, and available guides. Call this first.',
+    inputSchema: {},
+    outputSchema: getContextOutputSchema
+  },
+  async () => {
+    // Fetch hub nodes (top 5 most-connected)
+    const hubResult = await callRaHApi('/api/nodes?sortBy=edges&limit=5', { method: 'GET' });
+    const hubNodes = Array.isArray(hubResult.data) ? hubResult.data.map(n => ({
+      id: n.id,
+      title: n.title,
+      description: n.description ?? null,
+      edgeCount: n.edge_count ?? 0
+    })) : [];
+
+    // Fetch dimensions
+    const dimResult = await callRaHApi('/api/dimensions', { method: 'GET' });
+    const dimensions = Array.isArray(dimResult.data) ? dimResult.data.map(d => ({
+      name: d.name,
+      nodeCount: d.node_count ?? 0,
+      description: d.description ?? null
+    })) : [];
+
+    // Fetch guides
+    const guideResult = await callRaHApi('/api/guides', { method: 'GET' });
+    const guides = Array.isArray(guideResult.data) ? guideResult.data.map(g => g.name) : [];
+
+    // Get counts
+    const nodeCount = hubNodes.length > 0 ? undefined : 0;
+    const stats = {
+      nodeCount: nodeCount ?? hubNodes.reduce((_, n) => 0, 0),
+      edgeCount: 0,
+      dimensionCount: dimensions.length
+    };
+
+    // Try to get actual counts from a stats endpoint or compute
+    try {
+      const countResult = await callRaHApi('/api/nodes?limit=1', { method: 'GET' });
+      if (countResult.total !== undefined) {
+        stats.nodeCount = countResult.total;
+      }
+    } catch { /* use defaults */ }
+
+    const summary = `Knowledge graph: ${stats.dimensionCount} dimensions, ${hubNodes.length} hub nodes. ${guides.length} guides available.`;
+
+    return {
+      content: [{ type: 'text', text: summary }],
+      structuredContent: {
+        schema: stats,
+        hubNodes,
+        dimensions,
+        guides
+      }
+    };
+  }
+);
+
 async function main() {
   const transport = new StdioServerTransport();
   await server.connect(transport);