Merge pull request #987 from alpiua/fix-mcp-null-payload

fix(mcp): handle null JSON-RPC request payloads safely

tests/test_mcp_server.py

@@ -148,6 +148,20 @@ class TestHandleRequest:
         )
         assert resp["error"]["code"] == -32601
 
+    def test_tools_call_missing_params(self):
+        from mempalace.mcp_server import handle_request
+
+        for bad_params in [None, {}, {"arguments": {}}]:
+            resp = handle_request(
+                {
+                    "method": "tools/call",
+                    "id": 15,
+                    "params": bad_params,
+                }
+            )
+            assert resp["error"]["code"] == -32602
+            assert "Invalid params" in resp["error"]["message"]
+
     def test_unknown_method(self):
         from mempalace.mcp_server import handle_request
 
@@ -190,6 +204,17 @@ class TestHandleRequest:
         resp = handle_request({"method": None, "id": 99, "params": {}})
         assert resp["error"]["code"] == -32601
 
+    @pytest.mark.parametrize("payload", [None, [], "plain", 42, True])
+    def test_handle_request_invalid_payload_returns_jsonrpc_error(self, payload):
+        from mempalace.mcp_server import handle_request
+
+        resp = handle_request(payload)
+        assert resp == {
+            "jsonrpc": "2.0",
+            "id": None,
+            "error": {"code": -32600, "message": "Invalid Request"},
+        }
+
     def test_tools_call_dispatches(self, monkeypatch, config, palace_path, seeded_kg):
         _patch_mcp_server(monkeypatch, config, seeded_kg)
         from mempalace.mcp_server import handle_request