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Tool Schemas Are an API Contract (Treat Them Like One)

This story is from 2026-10-21. It is preserved in the archive; the latest stories are on the live feed.

Earlier this year, the people who maintain the Model Context Protocol loosened the types on tool schemas. The headline change was to structuredContent , the field a tool uses to return machine-readable results: it went from { [key: string]: unknown } to unknown , so tools could return arrays and pr…

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  1. 2026-10-21 23:31 · DEV Community — AI
    Tool Schemas Are an API Contract (Treat Them Like One)

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