feat(mcp): support filtering tool results by a jq expression

Author: stainless-app[bot]

src/core.ts

@@ -299,10 +299,10 @@ export abstract class APIClient {
     return null;
   }
 
-  buildRequest<Req>(
+  async buildRequest<Req>(
     inputOptions: FinalRequestOptions<Req>,
     { retryCount = 0 }: { retryCount?: number } = {},
-  ): { req: RequestInit; url: string; timeout: number } {
+  ): Promise<{ req: RequestInit; url: string; timeout: number }> {
     const options = { ...inputOptions };
     const { method, path, query, defaultBaseURL, headers: headers = {} } = options;
 
@@ -450,7 +450,9 @@ export abstract class APIClient {
 
     await this.prepareOptions(options);
 
-    const { req, url, timeout } = this.buildRequest(options, { retryCount: maxRetries - retriesRemaining });
+    const { req, url, timeout } = await this.buildRequest(options, {
+      retryCount: maxRetries - retriesRemaining,
+    });
 
     await this.prepareRequest(req, { url, options });
 

tests/index.test.ts

@@ -26,22 +26,22 @@ describe('instantiate client', () => {
       apiKey: 'My API Key',
     });
 
-    test('they are used in the request', () => {
-      const { req } = client.buildRequest({ path: '/foo', method: 'post' });
+    test('they are used in the request', async () => {
+      const { req } = await client.buildRequest({ path: '/foo', method: 'post' });
       expect((req.headers as Headers)['x-my-default-header']).toEqual('2');
     });
 
-    test('can ignore `undefined` and leave the default', () => {
-      const { req } = client.buildRequest({
+    test('can ignore `undefined` and leave the default', async () => {
+      const { req } = await client.buildRequest({
         path: '/foo',
         method: 'post',
         headers: { 'X-My-Default-Header': undefined },
       });
       expect((req.headers as Headers)['x-my-default-header']).toEqual('2');
     });
 
-    test('can be removed with `null`', () => {
-      const { req } = client.buildRequest({
+    test('can be removed with `null`', async () => {
+      const { req } = await client.buildRequest({
         path: '/foo',
         method: 'post',
         headers: { 'X-My-Default-Header': null },
@@ -237,20 +237,20 @@ describe('request building', () => {
   const client = new Browserbase({ apiKey: 'My API Key' });
 
   describe('Content-Length', () => {
-    test('handles multi-byte characters', () => {
-      const { req } = client.buildRequest({ path: '/foo', method: 'post', body: { value: '—' } });
+    test('handles multi-byte characters', async () => {
+      const { req } = await client.buildRequest({ path: '/foo', method: 'post', body: { value: '—' } });
       expect((req.headers as Record<string, string>)['content-length']).toEqual('20');
     });
 
-    test('handles standard characters', () => {
-      const { req } = client.buildRequest({ path: '/foo', method: 'post', body: { value: 'hello' } });
+    test('handles standard characters', async () => {
+      const { req } = await client.buildRequest({ path: '/foo', method: 'post', body: { value: 'hello' } });
       expect((req.headers as Record<string, string>)['content-length']).toEqual('22');
     });
   });
 
   describe('custom headers', () => {
-    test('handles undefined', () => {
-      const { req } = client.buildRequest({
+    test('handles undefined', async () => {
+      const { req } = await client.buildRequest({
         path: '/foo',
         method: 'post',
         body: { value: 'hello' },