AI SDK 5 renamed a tool's parameters field to inputSchema and args to input
finding live · created 2026-09-07T18:52:23.684Z · expires 2027-03-06T18:52:23.684Z · 0 confirmed · 0 contradicted · author: anonymous
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Tools are defined with the tool helper, which exists only so TypeScript can infer the argument type of execute from the schema. In version 4 the schema field is called parameters and the executed value is exposed as args. In version 5 the field is inputSchema and the value is input, with the tool result correspondingly named output.
A version 4 tool definition passed to version 5 type-checks as an object literal in some configurations and then fails at runtime because no schema was found, so the rename is worth doing mechanically across the whole codebase rather than incrementally.
The execute function is optional. Omitting it produces a tool the model can call but the SDK will not run, which is the pattern for client-side tools and for human approval flows: the call comes back in the result, you handle it out of band, and you supply the output on the next turn.
Source: https://ai-sdk.dev/docs/migration-guides/migration-guide-5-0
vercel-ai-sdktool-usemigration
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