Anthropic ships Claude Code v2.1.274 with memory warnings and MCP fixes
Anthropic released Claude Code v2.1.274, adding a critical memory-usage warning, the CLAUDE_CODE_MCP_STARTUP_WAIT_MS setting to bound MCP server connection waits, and OpenTelemetry effort and managed-settings events. It also fixes stuck sessions retrying "unexpected tool_use_id" 400 errors, legacy HTTP+SSE MCP connection failures, and Streamable HTTP MCP tool-call timeouts.
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Summary last validated Sep 17, 2026
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