Claude Code v2.1.273 has been released, bringing several stability improvements and enhanced diagnostic capabilities for developers using various cloud environments.
Claude Code v2.1.273 Public — Improved MCP connectivity and enhanced error diagnostics
New Features and Improvements
- LLM Gateway Support: Added new request headers (
x-claude-code-request-class,x-claude-code-agent-type, etc.) to allow gateways to access more context. - Improved Error Diagnostics: Error messages for Bedrock, Vertex, and Foundry now provide specific guidance on refreshing credentials or contacting administrators instead of generic 401/403 errors.
- MCP Enhancements: Added notifications for mid-session MCP server disconnections and introduced automatic reconnection attempts.
- Session Management: Improved responsiveness in long sessions by optimizing how sub-agent activity and hooks are processed.
- Artifact Tool Updates: Improved error handling when publishing files and added better visibility into the capabilities and database rules of the artifact service.
Bug Fixes
- Permission Handling: Fixed issues where certain Bash commands or subshells were incorrectly handled by the permission checker.
- Context Management: Corrected a bug where the context meter and auto-compact advisor inaccurately reported token usage.
- Environment Stability: Resolved issues with scheduled tasks running in incorrect sessions after directory moves and fixed permission errors on macOS when dragging in screenshots.
- Integration Fixes: Addressed various issues within VS Code, GitHub integration, and Slack (Claude Tag) to ensure reliable performance during collaborative workflows.
Sources
- v2.1.273 （2026-09-15）