fix(openai): raise minimal reasoning for native web search

extensions/openai/native-web-search.ts

@@ -57,6 +57,14 @@ function isManagedWebSearchTool(tool: unknown): boolean {
   return isRecord(tool) && tool.type === "function" && tool.name === OPENAI_WEB_SEARCH_TOOL.type;
 }
 
+function raiseMinimalReasoningForOpenAINativeWebSearch(payload: Record<string, unknown>): void {
+  const reasoning = payload.reasoning;
+  if (!isRecord(reasoning) || reasoning.effort !== "minimal") {
+    return;
+  }
+  reasoning.effort = "low";
+}
+
 export function patchOpenAINativeWebSearchPayload(
   payload: unknown,
 ): OpenAINativeWebSearchPatchResult {
@@ -70,10 +78,12 @@ export function patchOpenAINativeWebSearchPayload(
     if (filteredTools.length !== existingTools.length) {
       payload.tools = filteredTools;
     }
+    raiseMinimalReasoningForOpenAINativeWebSearch(payload);
     return "native_tool_already_present";
   }
 
   payload.tools = [...filteredTools, OPENAI_WEB_SEARCH_TOOL];
+  raiseMinimalReasoningForOpenAINativeWebSearch(payload);
   return "injected";
 }
 

extensions/openai/openai-provider.test.ts

@@ -400,6 +400,33 @@ describe("buildOpenAIProvider", () => {
     ]);
   });
 
+  it("raises minimal reasoning when native OpenAI web search is injected", () => {
+    const provider = buildOpenAIProvider();
+    const wrap = provider.wrapStreamFn;
+    expect(wrap).toBeTypeOf("function");
+    if (!wrap) {
+      throw new Error("expected OpenAI wrapper");
+    }
+
+    const result = runWrappedPayloadCase({
+      wrap,
+      provider: "openai",
+      modelId: "gpt-5.4",
+      model: {
+        api: "openai-responses",
+        provider: "openai",
+        id: "gpt-5.4",
+        baseUrl: "https://api.openai.com/v1",
+      } as Model<"openai-responses">,
+      payload: {
+        reasoning: { effort: "minimal", summary: "auto" },
+      },
+    });
+
+    expect(result.payload.reasoning).toEqual({ effort: "low", summary: "auto" });
+    expect(result.payload.tools).toEqual([{ type: "web_search" }]);
+  });
+
   it("does not inject native OpenAI web search when disabled or proxied", () => {
     const provider = buildOpenAIProvider();
     const wrap = provider.wrapStreamFn;