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Sweep 27 Oct 2026 · 19:04Z Build v2.1.312 531 read Stable v2.1.308 Latest v2.1.312 Next v2.1.312 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.312 ·

A subagent's delivered report is now reviewed by the safety check

Reports a subagent hands back are now reviewed by the safety check, which also records more about how the handoff was set up

You'll notice Improvements
JSON All of v2.1.312
You'll noticeTier: how much it should matter to you
2Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
SubagentsArea: what it touches
ImprovementsKind: in v2.1.312,
ImprovementsSection of the release

Unclear Whether the report-delivery tool is available to subagents by default is not stated.

What

A subagent is a helper Claude starts to do part of a job. A subagent can hand its final report back to the agent that started it through a tool, which answers "Report delivered to your caller." That report is now reviewed by the automatic safety check, and the check records more about each handoff: what kind it was, what the subagent was expected to hand back, and where the handoff happened.

Output recovered from a subagent that was cut off before finishing is labelled as partial output, with a note that the agent did not finish its task. Whether delivering the report ends the subagent's turn still depends on a remote switch, which is on unless it is switched off remotely.

Why

What a subagent hands back now passes the same safety review as other actions, so a report that the check objects to can be caught before it reaches the agent that asked for it.

Read from
Feature flag
tengu_purring_pine Not enough to say

Nothing here resolved what this flag was doing on this version, so nothing here should be read as on or off.

This account: no value returned · anonymous baseline: no value returned · compiled default in v2.1.312: on

These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.

Read once, for one account on one subscription tier, against v2.1.312. It isn't a statement about your account. What a flag value here can and cannot tell you

How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtWhether the report-delivery tool is available to subagents by default is not stated.

See this entry in the whole of v2.1.312 →

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