fix(codex): restrict openai image routing to codex responses

apps/aether-gateway/src/ai_serving/planner/standard/openai/chat/decision/request.rs

@@ -501,20 +501,6 @@ pub(crate) async fn resolve_local_openai_chat_candidate_payload_parts(
     };
 
     let provider_api_format = provider_api_format.trim().to_ascii_lowercase();
-    if provider_api_format == "openai:image" {
-        return resolve_openai_chat_to_openai_image_payload_parts(
-            state,
-            parts,
-            trace_id,
-            body_json,
-            input,
-            eligible,
-            candidate_index,
-            candidate_id,
-            upstream_is_stream,
-        )
-        .await;
-    }
 
     let Some(conversion_kind) =
         request_conversion_kind("openai:chat", provider_api_format.as_str())

apps/aether-gateway/src/ai_serving/planner/standard/openai/image_intent.rs

@@ -1,75 +0,0 @@
-pub(crate) fn openai_request_is_image_generation_intent(
-    requested_model: &str,
-    body_json: &serde_json::Value,
-) -> bool {
-    openai_model_is_image_generation(requested_model)
-        || body_json
-            .get("model")
-            .and_then(serde_json::Value::as_str)
-            .is_some_and(openai_model_is_image_generation)
-        || openai_tool_choice_selects_image_generation(body_json.get("tool_choice"))
-}
-
-fn openai_model_is_image_generation(model: &str) -> bool {
-    model.trim().to_ascii_lowercase().starts_with("gpt-image-")
-}
-
-fn openai_tool_choice_selects_image_generation(choice: Option<&serde_json::Value>) -> bool {
-    let Some(choice) = choice else {
-        return false;
-    };
-    if let Some(value) = choice.as_str() {
-        return value.trim().eq_ignore_ascii_case("image_generation");
-    }
-    let Some(object) = choice.as_object() else {
-        return false;
-    };
-    object
-        .get("type")
-        .and_then(serde_json::Value::as_str)
-        .is_some_and(|value| value.trim().eq_ignore_ascii_case("image_generation"))
-        || object
-            .get("tool")
-            .and_then(|value| value.get("type"))
-            .and_then(serde_json::Value::as_str)
-            .is_some_and(|value| value.trim().eq_ignore_ascii_case("image_generation"))
-        || object
-            .get("function")
-            .and_then(|value| value.get("name"))
-            .and_then(serde_json::Value::as_str)
-            .is_some_and(|value| value.trim().eq_ignore_ascii_case("image_generation"))
-}
-
-#[cfg(test)]
-mod tests {
-    use super::openai_request_is_image_generation_intent;
-    use serde_json::json;
-
-    #[test]
-    fn detects_openai_image_generation_intent_like_compat_proxies() {
-        assert!(openai_request_is_image_generation_intent(
-            "GPT-IMAGE-2",
-            &json!({})
-        ));
-        assert!(openai_request_is_image_generation_intent(
-            "gpt-5",
-            &json!({"model":"gpt-image-2"})
-        ));
-        assert!(openai_request_is_image_generation_intent(
-            "gpt-5",
-            &json!({"tool_choice":{"function":{"name":"image_generation"}}})
-        ));
-        assert!(openai_request_is_image_generation_intent(
-            "gpt-5",
-            &json!({"tool_choice":{"type":"image_generation"}})
-        ));
-        assert!(!openai_request_is_image_generation_intent(
-            "gpt-5",
-            &json!({"tools":[{"type":"image_generation"}]})
-        ));
-        assert!(!openai_request_is_image_generation_intent(
-            "gpt-5",
-            &json!({"messages":[{"role":"user","content":"hello"}]})
-        ));
-    }
-}

apps/aether-gateway/src/ai_serving/planner/standard/openai/responses/decision/request.rs

@@ -113,8 +113,13 @@ pub(crate) async fn resolve_local_openai_responses_candidate_payload_parts(
         .provider_type
         .trim()
         .eq_ignore_ascii_case("grok");
+    let is_codex = transport
+        .provider
+        .provider_type
+        .trim()
+        .eq_ignore_ascii_case("codex");
 
-    if provider_api_format.eq_ignore_ascii_case("openai:image") {
+    if is_codex && provider_api_format.eq_ignore_ascii_case("openai:image") {
         return resolve_openai_responses_to_openai_image_payload_parts(
             state,
             parts,