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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.239

Idle detection can dump its state for debugging

Use it now
Useful2 Signal3
Diagnostics Notable not in their notes

Set an environment variable to dump running tasks and teammate state whenever a session is judged idle.

CLAUDE_CODE_BG_TASKS_REPORT_RUNNING
What

When Claude Code decides a session is idle, it can print the running task list plus teammate and notification state. Off unless you set CLAUDE_CODE_BG_TASKS_REPORT_RUNNING.

Evidence

CLAUDE_CODE_BG_TASKS_REPORT_RUNNING

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.239 →