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[v1.x] fix(protocol): answer -32602 for requests whose params fail the schema - #2932
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…e schema Protocol.setRequestHandler parsed the request with parseWithCompat, which throws the raw ZodError. It has no numeric code, so _onrequest answered -32603 Internal error with the Zod issue dump as the message. Parse with safeParse instead and throw McpError(InvalidParams) on failure, so callers get -32602 "Invalid params for <method>: ...". This also makes the existing InvalidParams guards in the Client and Server wrappers (elicitation, sampling, tools/call) reachable again, since they run after this parse. Drops the three e2e knownFailures that pinned the old behaviour, and lets the mcpserver logging/setLevel scenario send its invalid level past the wire sniffer, as it already does on main. Backport of the fix for #2916 / #2284.
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Part of #2916 (same bug as #2284). This is the v1.x side; the main-branch fix is in #2492, and the triage on #2284 noted v1.x needs it too.
On v1.x,
Protocol.setRequestHandlerparses the request withparseWithCompat, which throws the rawZodError. That error has no numericcode, so_onrequestanswers-32603Internal error with the Zod issue dump as the message. It's a bit wider than on main, because this parse runs before the role-specific guards. Eventools/callwith a badnamecomes back as -32603, and theInvalidParamschecks in the Client (elicitation, sampling) and Server (tools/call) wrappers are never reached.The fix uses
safeParseand throwsMcpError(ErrorCode.InvalidParams, "Invalid params for <method>: ..."). The message is built withgetParseErrorMessage, the same helper McpServer uses for its argument errors, so it reads likeInvalid option: expected one of ... at params.levelrather than a JSON dump.Over Streamable HTTP against an
McpServer, with a well-formed control for each method:Tests
test/shared/protocol.test.tsforprompts/getwith{}andlogging/setLevelwith{ level: 'loud' }. It fails before the fix and passes after.knownFailuresthat pinned the old behaviour (protocol:error:invalid-params,logging:set-level:invalid-level,elicitation:form:schema:restricted-subset). Those 13 cells now pass.logging:set-level:invalid-levelscenario now passes{ strictValidation: false }, as it does on main. Without it the wire sniffer drops the invalid level before it reaches the server.npm test(1843 passed), typecheck and eslint are clean.npm run test:e2epasses excepttransport:stdio:shutdown-escalation, which also fails on a clean v1.x on my Windows machine.