diff --git a/server/mcp-server/index.js b/server/mcp-server/index.js
index 41f696c..3978a17 100644
--- a/server/mcp-server/index.js
+++ b/server/mcp-server/index.js
@@ -757,14 +757,16 @@ async function handleJsonRpc(req, res) {
 
   // 批量消息
   if (Array.isArray(message)) {
-    const results = await Promise.all(message.map(m => processRpc(m)));
+    const results = await Promise.all(message.map(m => processRpcWithRes(m, res)));
     return res.json(results);
   }
 
-  const result = await processRpc(message);
+  const result = await processRpcWithRes(message, res);
   return res.json(result);
 }
 
+async function processRpcWithRes(message, res) {
+
 async function processRpc(message) {
   const { jsonrpc, id, method, params } = message;
 
@@ -778,6 +780,9 @@ async function processRpc(message) {
     case 'initialize': {
       const sessionId = crypto.randomUUID();
       sessions.set(sessionId, { created: Date.now() });
+      // Session ID 通过 HTTP Header 传递，不在 JSON 响应体中带 _meta
+      // WorkBuddy 客户端校验严格，不认识 _meta 字段
+      res.setHeader('Mcp-Session-Id', sessionId);
 
       return {
         jsonrpc: '2.0',
@@ -793,9 +798,6 @@ async function processRpc(message) {
             title: '铸渊 MCP Server · 光湖代码仓库',
           },
         },
-        _meta: {
-          sessionId,
-        },
       };
     }