feat(tools): check unknown-tool protocol errors and id correlation - #508
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…lation Add the tools-call-protocol-error server scenario. It calls a tool the server does not have, once with a numeric and once with a string request id, and then tools/list with a string id, and checks eight things on the raw frames: the unknown tool comes back as a JSON-RPC error response and not as a CallToolResult with isError, the error code is the -32602 the specification example uses (WARNING), error.code is an integer, error.message is a string, an error response carries no result member, and both error and result responses echo the request id with its type intact. The everything-server pins SDK 1.x, whose McpServer folds its own InvalidParams error for an unknown tool into an isError result. Guard the tools/call handler so the protocol error reaches the wire, the way the 2.x SDK already does. A negative fixture answers unknown tools with isError and stringifies ids; its vitest case asserts the FAILURE, the WARNING, and the not-testable reporting of the dependent checks.
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tools-call-protocol-errorcalls a tool the server does not have and reads the raw response frame. It catches an unknown tool answered with aCallToolResultcarryingisError: trueand no JSON-RPC error response, and a request id echoed with the wrong type.The Tools page lists unknown tools under protocol errors, and the base protocol page makes the id echo a MUST for error and result responses.
603217006affe5c0The
ToolErrorraised attool_manager.py:85is folded into anisErrorresult atserver.py:437, which typescript-sdk changed in 2.0.0-alpha.1 (#1389), and the five dependent checks report "Not testable" per #248.The vendored everything-server pins SDK 1.29, which folds the same way, so this change guards its
tools/callhandler and throws theMcpErrorfirst.npm testpasses 624/624. The negative fixturetools-call-unknown-tool-as-result.tscarries a vitest case for the FAILURE.The probes are the wire half of two reject vectors in
agent-evidence-vectors(a8-error-response-has-no-preimage,a4-duplicate-member); the corpus runs against any verifier from one command:{"jsonrpc": "2.0", "id": 4242, "result": {"content": [{"type": "text", "text": "Unknown tool: conformance_tool_that_does_not_exist"}], "isError": true}}