Anthropic released Claude Code version 2.1.286, addressing a wide range of bugs related to authentication, Model Context Protocol (MCP) handling, and background subagents.
- Fixed issues where multiple permission requests stacked without count indicators or caused login loops upon credential expiration.
- Resolved errors where API calls failed if tools returned non-text types, and fixed cloud sessions hanging on large histories.
- Improved security by ensuring MCP error messages and logs properly redact secrets, including those with invisible characters or complex URL passwords.
- Enhanced subagent reliability by fixing issues with task-tracking tool visibility, worktree isolation, and message delivery during session exits.
- Added VS Code features including a Bookmarks side panel, question preview cards, and improved plugin management dialogs.
These changes improve the stability of long-running sessions, enhance security posture regarding secret leakage, and streamline the developer experience within integrated environments.