feat!: Migrate to zod 4

[fabien0102]

Motivation and Context

Zod 4 is now stable and bring a lot of performance optimization, it’s time to use it for mcp to benefit from this.

https://zod.dev/v4

How Has This Been Tested?

I only run the unit tests locally

Breaking Changes

The user zod schemas are now using zod@4 instead of zod@3 Here are the list of breaking changes -> https://zod.dev/v4/changelog?id=default-updates

You can also run npx zod-v3-to-v4 to migrate your existing projects (https://github.com/nicoespeon/zod-v3-to-v4)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update

Checklist

• I have read the MCP Documentation
• My code follows the repository's style guidelines
• New and existing tests pass locally
• I have added appropriate error handling
• I have added or updated documentation as needed

Additional context

Zod 4 introduces two new concepts: Registries and JSON schema. Those both features were used to provide a better implementation (I hope)

The regitry is used to provide the metadata required for completable, the types are following but so far I needed to add a ts-ignore to make typescript happy. Any help will be appreciated to fix this but I’m not sure it’s worth it.

[fabien0102]

Already quite of PR on the subject, let’s close this one (sorry for the noise)