feat(mcp): add Model Context Protocol server integration

.changeset/mcp-tools-port.md

@@ -0,0 +1,19 @@
+---
+'@livekit/agents': patch
+---
+
+feat(mcp): add MCP (Model Context Protocol) server integration
+
+Ports MCP tool support from `livekit-agents` (Python). Tools exposed by an
+MCP server are fetched on activity start and merged into the agent's tool
+context. Both stdio and HTTP transports (SSE + streamable HTTP) are supported.
+
+```ts
+const session = new voice.AgentSession({
+  mcpServers: [new llm.MCPServerHTTP({ url: 'http://localhost:8000/sse' })],
+  // ...
+});
+```
+
+`@modelcontextprotocol/sdk` is an optional peer dependency: install it with
+`pnpm add @modelcontextprotocol/sdk` to use this feature.

agents/package.json

@@ -83,6 +83,12 @@
   },
   "peerDependencies": {
     "@livekit/rtc-node": "catalog:",
+    "@modelcontextprotocol/sdk": "^1.25.0",
     "zod": "^3.25.76 || ^4.1.8"
+  },
+  "peerDependenciesMeta": {
+    "@modelcontextprotocol/sdk": {
+      "optional": true
+    }
   }
 }

agents/src/llm/index.ts

@@ -83,3 +83,17 @@ export {
   type AvailabilityChangedEvent,
   type FallbackAdapterOptions,
 } from './fallback_adapter.js';
+
+export {
+  MCPServer,
+  MCPServerHTTP,
+  MCPServerStdio,
+  type MCPHTTPTransportType,
+  type MCPServerHTTPOptions,
+  type MCPServerOptions,
+  type MCPServerStdioOptions,
+  type MCPToolCallResult,
+  type MCPToolContent,
+  type MCPToolResultContext,
+  type MCPToolResultResolver,
+} from './mcp.js';