Anthropic has released Claude Code v2.1.274, which introduces several improvements to the developer experience and tool stability. Key updates include enhanced monitoring for memory usage and more robust connectivity handling for MCP (Model Context Protocol) servers.
Product LaunchesAnthropicClaude Code
Claude Code v2.1.274 Released — Improved MCP stability and VS Code integration
New Features and Improvements
- Added critical memory usage warnings with guidance for safe restarts or memory freeing.
- Introduced
CLAUDE_CODE_MCP_STARTUP_WAIT_MSto control the connection wait time for non-interactive MCP server startups. - Enhanced telemetry with new OTel (OpenTelemetry) attributes for LLM requests and managed settings.
- Improved Claude apps gateway performance, including faster spend-limit checks and more resilient PostgreSQL connections.
- Added improved visibility for memory and instructions within the VS Code Customize menu.
Bug Fixes
- Resolved issues where sessions would get stuck in retry loops due to "unexpected tool_use_id" 400 errors.
- Fixed several MCP-related issues, including connectivity failures for legacy HTTP+SSE servers and timeout problems with Streamable HTTP tool calls.
- Addressed bugs where active
/goalsessions or subagents would lose state/models after auto-updates or context overflows. - Fixed VS Code extension bugs related to editor group locking, terminal window freezing, and UI rendering in High Contrast themes.
- Resolved various Claude Tag issues in Slack, including improved message delivery and better handling of channel permissions.
Sources
- v2.1.274 （2026-09-17）