docs+test: clarify parseStandardSchema error message; send _meta in normalize test

Author: felixweinberger

packages/core/src/util/standardSchema.ts

@@ -182,7 +182,8 @@ export async function validateStandardSchema<T extends StandardSchemaV1>(
 
 /**
  * Parses data against any Standard Schema. Async because Standard Schema's `validate` may return
- * a Promise. The error is wrapped as an `Error` so callers can interpolate `.message` directly.
+ * a Promise. The error is wrapped as an `Error` whose `.message` is the formatted issues string
+ * from {@linkcode validateStandardSchema}, so callers can interpolate it directly.
  *
  * Use this for user-supplied schemas (e.g. the 3-arg `setRequestHandler(method, paramsSchema, h)`
  * form). For internal SDK Zod schemas, prefer the synchronous `parseSchema` in `./schema.js`.

packages/core/test/shared/threeArgHandlers.test.ts

@@ -49,7 +49,7 @@ describe('setRequestHandler — three-arg paramsSchema form', () => {
             seen = p;
             return {};
         });
-        await a.request({ method: 'acme/noop' }, z.object({}));
+        await a.request({ method: 'acme/noop', params: { _meta: { trace: 'x' } } }, z.object({}));
         expect(seen).toEqual({});
     });
 });