diff --git a/MemoryKnowledge/src/mcp/http-client.ts b/MemoryKnowledge/src/mcp/http-client.ts
index a98df80..1521577 100644
--- a/MemoryKnowledge/src/mcp/http-client.ts
+++ b/MemoryKnowledge/src/mcp/http-client.ts
@@ -36,6 +36,8 @@ export async function callApi(
   const url = `${opts.baseUrl.replace(/\/$/, "")}/v3${endpoint}`;
   const headers: Record<string, string> = { "Content-Type": "application/json" };
   if (opts.token) headers["Authorization"] = `Bearer ${opts.token}`;
+  // GODCALL: query endpoints require the memory-instance id header.
+  headers["x-tdai-service-id"] = process.env.KNOWLEDGE_SERVICE_ID || "default";
 
   log.debug(`POST ${url}`);