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felixweinberger merged 3 commits into from
Oct 23, 2026
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docs: say that a spec handler's params drop members the spec does not define #3087

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docs: say that a spec handler's params drop members the spec does not…
felixweinberger Oct 23, 2026
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Merge branch 'main' into docs/low-level-params-note
felixweinberger Oct 23, 2026
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Merge branch 'main' into docs/low-level-params-note
felixweinberger Oct 23, 2026
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4 changes: 4 additions & 0 deletions docs/advanced/low-level-server.md
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Expand Up @@ -71,6 +71,10 @@ ProtocolError -32603: query.toLowerCase is not a function

`callTool` rejected with a protocol error instead of resolving to an `isError: true` tool result — [Errors](../servers/errors.md) covers the difference.

::: info
`request.params` is the request parsed with the spec schema, so a member the spec does not define — a `resource_type` next to `name` and `arguments`, say — is dropped before your handler runs.
:::

## Validate arguments yourself

From one Zod `inputSchema` the SDK derives the JSON Schema the model sees, validates arguments before your handler runs, and infers the handler's argument types. Here you wrote the JSON Schema by hand, the cast went unchecked, and nothing tied the two together.
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