diff --git a/mcp-wrapper/src/tools.ts b/mcp-wrapper/src/tools.ts
index 6201e74..aa68a99 100644
--- a/mcp-wrapper/src/tools.ts
+++ b/mcp-wrapper/src/tools.ts
@@ -192,10 +192,16 @@ export const toolSchemas: Record<ToolName, ToolSchema> = {
       "Retrieve the current session context payload (identity, session handle, " +
       "topic cluster, rich club). Call at session start to load relevant " +
       "background memory. Returns JSON with l0, l1, l2, rich_club, and " +
-      "compact_handle fields.",
+      "compact_handle fields. Optional session_id parameter to query a specific session.",
     inputSchema: {
       type: "object",
-      properties: {},
+      properties: {
+        session_id: {
+          type: "string",
+          description:
+            "Optional session id to query. When omitted, uses the wrapper's current session.",
+        },
+      },
     },
   },
   profile_get_set: {
@@ -361,8 +367,10 @@ export async function invokeTool(
       return bridge.call("memory_capture", args);
     case "memory_consolidate":
       return bridge.call("memory_consolidate", args);
-    case "memory_session_context":
-      return bridge.call("session_start_payload", {});
+    case "memory_session_context": {
+      const sessionId = (args.session_id as string) || null;
+      return bridge.call("session_start_payload", sessionId ? { session_id: sessionId } : {});
+    }
     case "profile_get_set": {
       const op = args.operation as string;
       if (op === "get") {