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The Claude Code Changelog · Yesterday · 5 min

Taming Worker Thinking with CLAUDE_CODE_SUBAGENT_EFFORT

Learn how to decouple worker reasoning from main sessions using the new CLAUDE_CODE_SUBAGENT_EFFORT environment variable in Claude Code 2.1.316. We also cover disabling ultrathink, blocking external file writes, and the timeline for Opus 4.8 fast mode deprecation.

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Learn how to decouple worker reasoning from main sessions using the new CLAUDE_CODE_SUBAGENT_EFFORT environment variable in Claude Code 2.1.316. We also cover disabling ultrathink, blocking external file writes, and the timeline for Opus 4.8 fast mode deprecation.

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