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WebMCP schema validity Stay organized with collections Save and categorize content based on your preferences.

A valid schema ensures that the AI agent understands the structure of the data it needs to provide.

How the WebMCP schema validity audit fails

The audit fails if:

Lighthouse also issues a warning if an optional field has a name but is missing a toolparamdescription or an associated <label>.

How to fix

  1. Ensure symmetry: Always provide both a name and a description for every tool.
  2. Add names to inputs: Verify that every input element within a tool form has a unique name attribute.
  3. Provide parameter context: Add toolparamdescription to inputs to help the agent understand what value is expected.

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Last updated 2026-05-05 UTC.

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