Fix AG MITM

open-sse/translator/formats.js

@@ -12,20 +12,19 @@ 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.
+ * Detect source format from request URL pathname + body.
+ * Returns null to fall back to body-based detection.
  */
-export function detectFormatByEndpoint(pathname) {
-  for (const [segment, format] of Object.entries(ENDPOINT_FORMAT_MAP)) {
-    if (pathname.includes(segment)) return format;
+export function detectFormatByEndpoint(pathname, body) {
+  // /v1/responses is always openai-responses
+  if (pathname.includes("/v1/responses")) return FORMATS.OPENAI_RESPONSES;
+
+  // /v1/chat/completions + input[] → treat as openai (Cursor CLI sends Responses body via chat endpoint)
+  if (pathname.includes("/v1/chat/completions") && Array.isArray(body?.input)) {
+    return FORMATS.OPENAI;
   }
+
   return null;
 }