Claude – v2.1.319

What’s in this update

What's changed

• Changed auto mode with telemetry or feature flags off, including behind LLM gateways: calls the server can't check are asked about or denied, with no fallback to the built-in classifier; set CLAUDE_CODE_AUTO_MODE_SERVER=0 to keep using it (Bedrock, Vertex and Foundry are unchanged)
• Changed auto mode behind an LLM gateway: CLAUDE_CODE_AUTO_MODE_SERVER=1 turns on the server-side check even with CLAUDE_CODE_DISABLE_EXPERIMENTAL_BETAS set; if managed settings set the latter, they must set the 1 too
• Added support for MCP tasks in the terminal: when an MCP server runs a tool call as a task, Claude Code moves it to the background right away and tells Claude the result when it finishes
• Added the CLAUDE_CODE_DISABLE_MCP_TASK_BACKGROUND environment variable to make Claude Code wait for an MCP task inside its tool call instead of moving it to the background right away
• Added permissions.denyInsteadOfPrompting setting: a tool call that would wait on a permission prompt is denied and the turn continues, in terminal sessions, subagents and teammates
• Added /claude-api latency-optimize to find where your Claude API code makes people wait and try faster settings against your eval
• Added the CLAUDE_CODE_DISABLE_FEATURE_FLAGS environment variable, which stops feature-flag fetching without turning off telemetry; every flag then uses its built-in default

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Read the full patch notes on github.com →

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