adding an MCP Server 🎉

mcp/stdio.js

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+/*
+ * Copyright (c) 2026 by Christian Kellner.
+ * Licensed under Apache-2.0 with Commons Clause and Attribution/Naming Clause
+ */
+
+#!/usr/bin/env node
+/*
+ * Copyright (c) 2026 by Christian Kellner.
+ * Licensed under Apache-2.0 with Commons Clause and Attribution/Naming Clause
+ */
+
+/**
+ * Fredy MCP Server – stdio transport
+ *
+ * Launches the MCP server over stdin/stdout so that local LLM clients
+ * (e.g. Claude Desktop, llm-cli, mcp-cli) can connect directly.
+ *
+ * Usage:
+ *   MCP_TOKEN=fredy_<your-token> node mcp/stdio.js
+ *
+ * The MCP_TOKEN environment variable must contain a valid Fredy MCP token.
+ * Each user has a permanent, non-expiring token shown in the user management list.
+ */
+import { fileURLToPath } from 'url';
+import path from 'path';
+import { StdioServerTransport } from '@modelcontextprotocol/sdk/server/stdio.js';
+import SqliteConnection from '../lib/services/storage/SqliteConnection.js';
+import { runMigrations } from '../lib/services/storage/migrations/migrate.js';
+import { createMcpServer } from './mcpAdapter.js';
+import { validateMcpToken } from '../lib/services/storage/userStorage.js';
+
+// Ensure cwd is the project root so that relative DB/config paths resolve correctly
+// (LM Studio and other MCP hosts may spawn this process from an arbitrary directory)
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+process.chdir(path.resolve(__dirname, '..'));
+
+// Initialize the database (required for standalone usage)
+await SqliteConnection.init();
+await runMigrations();
+
+const token = process.env.MCP_TOKEN;
+if (!token) {
+  process.stderr.write('Error: MCP_TOKEN environment variable is required.\n');
+  process.stderr.write('Each user has a permanent MCP token shown in the user management list.\n');
+  process.exit(1);
+}
+
+const auth = validateMcpToken(token);
+if (!auth) {
+  process.stderr.write('Error: Invalid MCP_TOKEN. Token not found or user no longer exists.\n');
+  process.exit(1);
+}
+
+const mcpServer = createMcpServer();
+
+// Wrap the stdio transport to inject authInfo into every message
+const transport = new StdioServerTransport();
+
+// Patch: the MCP SDK passes authInfo through the transport's onmessage extra param.
+// For stdio we inject the resolved user from the token.
+const patchedTransport = new Proxy(transport, {
+  set(target, prop, value) {
+    if (prop === 'onmessage') {
+      target.onmessage = (message, extra) => {
+        value(message, { ...extra, authInfo: { userId: auth.userId } });
+      };
+      return true;
+    }
+    target[prop] = value;
+    return true;
+  },
+  get(target, prop) {
+    return target[prop];
+  },
+});
+
+await mcpServer.connect(patchedTransport);
+process.stderr.write('Fredy MCP Server running on stdio\n');