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fix(core): make fromJsonSchema() use runtime-aware default validator … (#1825)

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Co-authored-by: Felix Weinberger <3823880+felixweinberger@users.noreply.github.com>
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Konstantin Konstantinov 2026-03-31 14:06:08 +03:00 • committed by GitHub
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docs/migration-SKILL.md
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@ -210,7 +210,7 @@ Zod schemas, all callback return types. Note: `callTool()` and `request()` signa
The variadic `.tool()`, `.prompt()`, `.resource()` methods are removed. Use the `register*` methods with a config object.
**IMPORTANT**: v2 requires schema objects implementing [Standard Schema](https://standardschema.dev/) — raw shapes like `{ name: z.string() }` are no longer supported. Wrap with `z.object()` (Zod v4), or use ArkType's `type({...})`, or Valibot. For raw JSON Schema, wrap with `fromJsonSchema(schema, validator)` from `@modelcontextprotocol/server`. Applies to `inputSchema`, `outputSchema`, and `argsSchema`.
**IMPORTANT**: v2 requires schema objects implementing [Standard Schema](https://standardschema.dev/) — raw shapes like `{ name: z.string() }` are no longer supported. Wrap with `z.object()` (Zod v4), or use ArkType's `type({...})`, or Valibot. For raw JSON Schema, wrap with `fromJsonSchema(schema)` from `@modelcontextprotocol/server` (validator defaults automatically; pass an explicit validator for custom configurations). Applies to `inputSchema`, `outputSchema`, and `argsSchema`.
### Tools