Claude Code v0.2.41

MCP (Model Context Protocol) Status Command

• New command: /mcp - Shows the connection status of all configured MCP servers
• Displays a formatted list of MCP servers with their connection states:
• connected (green) - Successfully connected to the server
• connecting… (yellow) - Connection in progress
• failed (red) - Connection failed
• Includes debug mode support with --mcp-debug flag for inline error logs
• Shows log file location for troubleshooting failed connections

Example output:

MCP Server Status

• server1: connected
• server2: connecting…
• server3: failed

Run claude with --mcp-debug to see error logs inline, or view log files in: /path/to/logs

Enhanced MCP Integration

• Improved MCP server connection handling with better error reporting
• Added connection timeout configuration (5 seconds default)
• MCP tools and prompts now have an isMcp: true property for better identification
• Better separation of MCP client state management

Logging Infrastructure

• New baseLogs() function added to the logging system for accessing the base log directory
• Enhanced MCP-specific logging with dedicated log files per server

Memory Management

• Added telemetry events for memory undo operations:
• tengu_memory_undo_attempt - Tracks when undo is attempted
• tengu_memory_undo_success - Tracks successful undo operations
• tengu_memory_undo_failure - Tracks failed undo operations

Refactored MCP Architecture

• Replaced monolithic MCP initialization with a more modular approach:
• New cS1() function for parallel MCP server connections
• New zx2() function for aggregating MCP resources
• New Qx2() React hook for managing MCP state in the UI
• Improved error handling with per-server error isolation
• Better separation of concerns between connection, tool discovery, and prompt discovery

Performance Optimizations

• Changed from SHA-256 web crypto API to Node.js native crypto module for hash operations
• More efficient stream handling with direct Readable imports
• Improved memoization for tool and command lists with new gl2() and Ul2() utility functions

Code Quality

• Better TypeScript/Zod schema validation for MCP server configurations
• Cleaner import organization and dependency management
• More consistent error messaging and logging patterns

• Fixed potential race conditions in MCP server connection initialization
• Improved error handling for failed MCP server connections
• Better cleanup of timeouts in connection handling

None - This release maintains backward compatibility with existing configurations and APIs.