docs: list removed schema.ts exports in migration guides

Author: felixweinberger

docs/migration-SKILL.md

@@ -286,6 +286,15 @@ Note: the third argument (`metadata`) is required — pass `{}` if no metadata.
 | `{}` (empty) | `z.object({})` |
 | `undefined` (no schema) | `undefined` or omit the field |
 
+### Removed core exports
+
+| Removed from `@modelcontextprotocol/core` | Replacement |
+|---|---|
+| `schemaToJson(schema)` | `standardSchemaToJsonSchema(schema)` |
+| `parseSchemaAsync(schema, data)` | `validateStandardSchema(schema, data)` |
+| `SchemaInput<T>` | `StandardSchemaWithJSON.InferInput<T>` |
+| `getSchemaShape`, `getSchemaDescription`, `isOptionalSchema`, `unwrapOptionalSchema` | none (internal Zod introspection helpers) |
+
 ## 7. Headers API
 
 Transport constructors and `RequestInfo.headers` now use the Web Standard `Headers` object instead of plain objects.

docs/migration.md

@@ -262,6 +262,15 @@ This applies to:
 - `outputSchema` in `registerTool()`
 - `argsSchema` in `registerPrompt()`
 
+**Removed Zod-specific helpers** from `@modelcontextprotocol/core` (use Standard Schema equivalents):
+
+| Removed | Replacement |
+|---|---|
+| `schemaToJson(schema)` | `standardSchemaToJsonSchema(schema)` |
+| `parseSchemaAsync(schema, data)` | `validateStandardSchema(schema, data)` |
+| `SchemaInput<T>` | `StandardSchemaWithJSON.InferInput<T>` |
+| `getSchemaShape`, `getSchemaDescription`, `isOptionalSchema`, `unwrapOptionalSchema` | No replacement — these were Zod introspection helpers for the now-obsolete completion path |
+
 ### Host header validation moved
 
 Express-specific middleware (`hostHeaderValidation()`, `localhostHostValidation()`) moved from the server package to `@modelcontextprotocol/express`. The server package now exports framework-agnostic functions instead: `validateHostHeader()`, `localhostAllowedHostnames()`,