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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
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Claude Code v2.1.311 ·

Activity notes from other sessions can be marked as not instructions

With idleObservationFence on, activity notes from peer sessions are fenced off as content rather than instructions

Use it now Notable No documentation found New Features
JSON All of v2.1.311
Use it nowTier: how much it should matter to you
4Useful: my rating, 1 to 5
4Signal: worth watching, 1 to 5
Peer MessagesArea: what it touches
New FeaturesKind: in v2.1.311,
What probably matters to youSection of the release

Unclear How idleObservationFence is set to true is not stated.

What

Some messages come from a peer, meaning another session, and report activity it observed. When the configuration value idleObservationFence is true, these messages are wrapped and marked as content that is not instructions. When it is false, which is the default, the record of where the message came from is cleared instead.

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Why

Fencing the text off makes it harder for words in a peer's message to be treated by Claude as commands.

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Names in the bundleidleObservationFence
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 doubtHow `idleObservationFence` is set to true is not stated.

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