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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 v2.1.187

--bg / --background — Launch as background agent

What

A new CLI flag that starts the session as a background agent and returns immediately, rather than waiting for the conversation to complete.

Usage
claude --bg "implement the feature described in TASK.md"
# or
claude --background "run the test suite and summarize failures"
Details
  • The session runs detached; you can track and manage it with claude agents
  • Useful for fire-and-forget tasks or parallel workstreams
Evidence

New flag definition (search for "--bg, --background" or "Start the session as a background agent")

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

See this entry in the whole of v2.1.187 →