6 pages for claude_code_fork_subagent.
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Agent SDK reference - Python
Claude Code CLI · in the page
agent-sdk/python
…ode off](/docs/en/sub-agents.md#turn-fork-mode-on-or-off) by setting `CLAUDE_CODE_FORK_SUBAGENT` to `0`. Before Python SDK v0.2.169, agents that your subagents started also ran in the background by d…
Claude Code changelog
Claude Code CLI · in the page
changelog
…K, the desktop app and VS Code, as they already are in the terminal; `CLAUDE_CODE_FORK_SUBAGENT=0` turns them off, and `claude mcp serve` never offers them * Changed the desktop app and VS Code to alw…
Environment variables
Claude Code CLI · in the page
env-vars
…| | `CLAUDE_CODE_FORK_SUBAGENT` | Controls [fork mode](/docs/en/sub-agents#turn-fork-mode-on-or-off), which…
Create custom subagents
Claude Code CLI · in the page
sub-agents
…agent 1. Turn [fork mode](#turn-fork-mode-on-or-off) off by setting `CLAUDE_CODE_FORK_SUBAGENT` to `0`, for example in [`settings.json`](/docs/en/settings): ```json theme={null} { "env":…
Week 17 · April 20–24, 2026
Claude Code CLI · in the page
whats-new/2026-w17
…ork-the-current-conversation) can be enabled on external builds with `CLAUDE_CODE_FORK_SUBAGENT=1`: a fork inherits your full conversation context instead of starting freshDefault [effort level](/docs…
Week 33 · August 10–14, 2026
Claude Code CLI · in the page
whats-new/2026-w33
…es in your conversation when it finishes. To turn fork mode off, set `CLAUDE_CODE_FORK_SUBAGENT=0`. [Turn fork mode on or off](/docs/en/sub-agents.md#turn-fork-mode-on-or-off) GitLab merge requests…