fix: allow null id in JSONRPCError per JSON-RPC 2.0 spec (#2056)

2026-02-17 10:30:34 +00:00 · 2026-02-17 10:30:34 +00:00 · 705497a593
commit 705497a593
parent 3b53fb9a00
1 changed files with 151 additions and 24 deletions
--- a/src/mcp/server/lowlevel/server.py
+++ b/src/mcp/server/lowlevel/server.py
@ -490,7 +490,7 @@ class Server(Generic[LifespanResultT]):
            except Exception as err:
                if raise_exceptions:  # pragma: no cover
                    raise err
-                response = types.ErrorData(code=0, message=str(err), data=None)
+                response = types.ErrorData(code=0, message=str(err))

            await message.respond(response)
        else:  # pragma: no cover