The sidecar registered a closed Zod schema, so the SDK judged arguments
before Rust ever saw them: an extra key was stripped, a missing required
property was refused with an MCP error, and the call never reached the
handler. The connector path decodes the same argument in Rust, where
`deny_unknown_fields` and required-field decoding turn a bad argument
into the gap the evaluator records.
`toolInputSchema` now builds a loose object whose every property
catches, so nothing is stripped and nothing is refused. The conversion
survives only to advertise: the in-process MCP server derives the schema
the model sees from this object, and that schema still carries every
property, type, bound, and `required` name the emitter produced. What is
deleted is the strictness that made it a second validator -- `.strict()`,
the closed-object requirement, and the every-property-is-required
requirement.
One case cannot be carried through as written: a value outside a
property's own type empties that property, so it reaches Rust as an
absent field rather than a wrong one. Rust still names the gap; the SDK
still does not answer the call.
The undispatched-tool_use protocol violation stays, because no argument
reaches it any more but a call never offered to the handler still does.
`resultFault` is the result-subtype mapping lifted out of `runQuery`, so
`error_max_turns` becoming an ordinary round and every other subtype
becoming its named fault are both asserted without a credential.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
a791d559d5