Claude Code v2.1.311 ·
Resumed background agents receive notes about the tools they used
When a background agent is resumed, Claude Code now passes it notes about the tools it used and the tools available to it
Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
1Signal: worth watching, 1 to 5
Background AgentsArea: what it touches
Internal ChangesKind: in v2.1.311,
Internal ChangesSection of the release
What
A subagent is a helper agent that Claude starts to handle part of a task, sometimes in the background. When one of these is resumed, Claude Code now:
- builds notices about which tools the agent used and passes them in
- passes the resumed agent the set of tools available to it, including tools for review
- includes the tools used when the agent hands its result back
When working out which kind of agent ran a web fetch, Claude Code no longer trusts information that came from the live output stream.
Why
This changes what a resumed subagent sees when it picks up again, and what it reports back when it finishes.
See this entry in the whole of v2.1.311 →
