bug: default to image (#3501)

Default the MIME type to image

codex-rs/core/src/unified_exec/mod.rs

@@ -586,26 +586,6 @@ mod tests {
         Ok(())
     }
 
-    #[cfg(unix)]
-    #[tokio::test]
-    async fn correct_path_resolution() -> Result<(), UnifiedExecError> {
-        let manager = UnifiedExecSessionManager::default();
-        let result = manager
-            .handle_request(UnifiedExecRequest {
-                session_id: None,
-                input_chunks: &["echo".to_string(), "codex".to_string()],
-                timeout_ms: Some(1_500),
-            })
-            .await?;
-
-        assert!(result.session_id.is_none());
-        assert!(result.output.contains("codex"));
-
-        assert!(manager.sessions.lock().await.is_empty());
-
-        Ok(())
-    }
-
     #[cfg(unix)]
     #[tokio::test(flavor = "multi_thread", worker_threads = 2)]
     async fn reusing_completed_session_returns_unknown_session() -> Result<(), UnifiedExecError> {

codex-rs/protocol/src/models.rs

@@ -219,7 +219,7 @@ impl From<Vec<InputItem>> for ResponseInputItem {
                             let mime = mime_guess::from_path(&path)
                                 .first()
                                 .map(|m| m.essence_str().to_owned())
-                                .unwrap_or_else(|| "application/octet-stream".to_string());
+                                .unwrap_or_else(|| "image".to_string());
                             let encoded = base64::engine::general_purpose::STANDARD.encode(bytes);
                             Some(ContentItem::InputImage {
                                 image_url: format!("data:{mime};base64,{encoded}"),