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Zod 4.x introduces breaking API changes that cause tool calls to fail with: 'keyValidator._parse is not a function'

This pins zod and zod-to-json-schema to versions compatible with @modelcontextprotocol/sdk's expectations.

Tested

Server starts successfully
Tool calls return data (no more keyValidator error)

Zod 4.x introduces breaking API changes that cause tool calls to fail with:
'keyValidator._parse is not a function'

This pins zod and zod-to-json-schema to versions compatible with
@modelcontextprotocol/sdk's expectations.
@jayzes
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jayzes commented Dec 1, 2025

Running into the same issue - would be great to get this merged/released!

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2 participants