feat(mcp-server): enhance session metadata with method and tool information

src/mcp-server-http.ts

@@ -304,7 +304,11 @@ export async function main() {
     const mcpInfo = extractMcpToolInfo(parsedBody);
 
     // Handle request within trace context (passing trace ID from header if available)
-    const sessionMetadata = getSessionMetadata("http");
+    const sessionMetadata = {
+      ...getSessionMetadata("http"),
+      mcp_method: mcpInfo.method,
+      tool: mcpInfo.tool,
+    };
     return await withSpan(
       "mcp_http_request",
       {

src/mcp-server-stdio.ts

@@ -187,7 +187,11 @@ export async function main() {
             isError: false,
           };
         },
-        getSessionMetadata("stdio"),
+        {
+          ...getSessionMetadata("stdio"),
+          mcp_method: "tools/call",
+          tool: searchSpecToolName,
+        },
       );
     },
   );
@@ -245,7 +249,11 @@ export async function main() {
             isError: false,
           };
         },
-        getSessionMetadata("stdio"),
+        {
+          ...getSessionMetadata("stdio"),
+          mcp_method: "tools/call",
+          tool: sectionContentToolName,
+        },
       );
     },
   );
@@ -299,7 +307,11 @@ export async function main() {
             isError,
           };
         },
-        getSessionMetadata("stdio"),
+        {
+          ...getSessionMetadata("stdio"),
+          mcp_method: "tools/call",
+          tool: evaluateToolName,
+        },
       );
     },
   );