Fix : Codex on cursor

open-sse/translator/formats.js

@@ -12,3 +12,20 @@ export const FORMATS = {
   CURSOR: "cursor"
 };
 
+// Map endpoint suffix → source format (takes priority over body-based detection)
+const ENDPOINT_FORMAT_MAP = {
+  "/v1/responses": FORMATS.OPENAI_RESPONSES,
+  "/v1/chat/completions": FORMATS.OPENAI,
+};
+
+/**
+ * Detect source format from request URL pathname.
+ * Returns null if no matching endpoint found.
+ */
+export function detectFormatByEndpoint(pathname) {
+  for (const [segment, format] of Object.entries(ENDPOINT_FORMAT_MAP)) {
+    if (pathname.includes(segment)) return format;
+  }
+  return null;
+}
+

open-sse/translator/request/openai-responses.js

@@ -143,6 +143,9 @@ export function openaiResponsesToOpenAIRequest(model, body, stream, credentials)
  * Convert OpenAI Chat Completions to OpenAI Responses API format
  */
 export function openaiToOpenAIResponsesRequest(model, body, stream, credentials) {
+  // Body already in Responses API format (e.g. Cursor CLI calling /chat/completions with input[])
+  if (body.input) return { ...body, model, stream: true };
+
   const result = {
     model,
     input: [],