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claude_code_releases · Sep 17, 2026 · release
Source brief
claude-code v2.1.274
github.comSep 17, 2026
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Release highlights
- Added a visible warning when memory usage is critical, with steps to free memory or restart safely
- Added CLAUDE_CODE_MCP_STARTUP_WAIT_MS to bound how long the first non-interactive turn waits for connecting MCP servers ( 0 = don't wait)
- Added effort attribute to the claude_code.llm_request OpenTelemetry trace span, matching the api_request event
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agentclaude code
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