fix(openai): default direct responses to sse

extensions/openai/openai-provider.test.ts

@@ -508,9 +508,9 @@ describe("buildOpenAIProvider", () => {
     });
 
     expect(extraParams).toMatchObject({
-      transport: "auto",
-      openaiWsWarmup: true,
+      transport: "sse",
     });
+    expect(extraParams?.openaiWsWarmup).toBeUndefined();
     expect(result.payload.store).toBe(true);
     expect(result.payload.context_management).toEqual([
       { type: "compaction", compact_threshold: 140_000 },

extensions/openai/openai-provider.ts

@@ -227,7 +227,7 @@ export function buildOpenAIProvider(): ProviderPlugin {
       shouldUseOpenAIResponsesTransport({ provider, api, baseUrl })
         ? { api: "openai-responses", baseUrl }
         : undefined,
-    ...buildOpenAIResponsesProviderHooks({ openaiWsWarmup: true }),
+    ...buildOpenAIResponsesProviderHooks({ transport: "sse" }),
     matchesContextOverflowError: ({ errorMessage }) =>
       /content_filter.*(?:prompt|input).*(?:too long|exceed)/i.test(errorMessage),
     resolveReasoningOutputMode: () => "native",

extensions/openai/shared.ts

@@ -50,10 +50,11 @@ function hasSupportedOpenAIResponsesTransport(
 
 function defaultOpenAIResponsesExtraParams(
   extraParams: Record<string, unknown> | undefined,
-  options?: { openaiWsWarmup?: boolean },
+  options?: { openaiWsWarmup?: boolean; transport?: "auto" | "sse" | "websocket" },
 ): Record<string, unknown> | undefined {
   const hasSupportedTransport = hasSupportedOpenAIResponsesTransport(extraParams?.transport);
   const hasExplicitWarmup = typeof extraParams?.openaiWsWarmup === "boolean";
+  const defaultTransport = options?.transport ?? "auto";
   const shouldDefaultWarmup = options?.openaiWsWarmup === true;
   if (hasSupportedTransport && (!shouldDefaultWarmup || hasExplicitWarmup)) {
     return extraParams;
@@ -61,7 +62,7 @@ function defaultOpenAIResponsesExtraParams(
 
   return {
     ...extraParams,
-    ...(hasSupportedTransport ? {} : { transport: "auto" }),
+    ...(hasSupportedTransport ? {} : { transport: defaultTransport }),
     ...(shouldDefaultWarmup && !hasExplicitWarmup ? { openaiWsWarmup: true } : {}),
   };
 }
@@ -93,6 +94,7 @@ const wrapOpenAIResponsesProviderStreamFn: NonNullable<
 
 export function buildOpenAIResponsesProviderHooks(options?: {
   openaiWsWarmup?: boolean;
+  transport?: "auto" | "sse" | "websocket";
 }): OpenAIResponsesProviderHooks {
   return {
     buildReplayPolicy: buildOpenAIReplayPolicy,