feat(codex): align Search and execution protocol

frontend/src/features/providers/components/__tests__/endpoint-default-paths.spec.ts

@@ -9,6 +9,7 @@ const apiFormats = [
   { value: 'gemini:embedding', default_path: '/v1beta/models/{model}:embedContent' },
   { value: 'gemini:video', default_path: '/v1beta/models/{model}:predictLongRunning' },
   { value: 'openai:responses', default_path: '/v1/responses' },
+  { value: 'openai:search', default_path: '/v1/alpha/search' },
   { value: 'openai:embedding', default_path: '/v1/embeddings' },
   { value: 'openai:rerank', default_path: '/v1/rerank' },
   { value: 'openai:image', default_path: '/v1/images/generations' },
@@ -75,6 +76,30 @@ describe('endpoint default paths', () => {
     })).toBe('/responses')
   })
 
+  it('uses the Search path relative to OpenAI and Codex api roots', () => {
+    expect(getDefaultEndpointBaseUrl({
+      apiFormat: 'openai:search',
+      baseUrl: 'https://api.openai.com',
+    })).toBe('https://api.openai.com/v1')
+    expect(getDefaultEndpointPath({
+      apiFormat: 'openai:search',
+      providerType: 'openai',
+      baseUrl: 'https://api.openai.com/v1',
+      apiFormats,
+    })).toBe('/alpha/search')
+
+    expect(getDefaultEndpointBaseUrl({
+      apiFormat: 'openai:search',
+      baseUrl: 'https://chatgpt.com/backend-api/codex',
+    })).toBe('https://chatgpt.com/backend-api/codex')
+    expect(getDefaultEndpointPath({
+      apiFormat: 'openai:search',
+      providerType: 'codex',
+      baseUrl: 'https://chatgpt.com/backend-api/codex',
+      apiFormats,
+    })).toBe('/alpha/search')
+  })
+
   it('drops /v1 from API-root defaults because base URL is the API root', () => {
     expect(getDefaultEndpointPath({
       apiFormat: 'openai:chat',

frontend/src/features/providers/components/__tests__/endpoint-protocol-policy.spec.ts

@@ -0,0 +1,15 @@
+import { describe, expect, it } from 'vitest'
+
+import { fixedEndpointUpstreamStreamPolicy } from '../endpoint-protocol-policy'
+
+describe('fixedEndpointUpstreamStreamPolicy', () => {
+  it('uses the fixed Codex transport mode for each protocol', () => {
+    expect(fixedEndpointUpstreamStreamPolicy('codex', 'openai:responses')).toBe('force_stream')
+    expect(fixedEndpointUpstreamStreamPolicy('codex', 'openai:search')).toBe('force_non_stream')
+  })
+
+  it('applies Search synchronization by format and keeps other formats configurable', () => {
+    expect(fixedEndpointUpstreamStreamPolicy('custom', 'openai:search')).toBe('force_non_stream')
+    expect(fixedEndpointUpstreamStreamPolicy('codex', 'openai:responses:compact')).toBeNull()
+  })
+})