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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 v2.1.236

Every session now advertises that it can send idle notices

Under the hood
Useful2 Signal5
Multi-Session Notable

Every session now advertises itself as able to send idle notices, with no flag guarding it.

Feature flag
tengu_harbor_kite On for this account, and not off by default

The flag server returned on for the one account this site reads, and nothing in this release compiles it off by default. The compiled default is shown below, and says which it is when we cannot read one: a fifth of gates compile in a string or a number rather than on or off, and most published releases have no gate table behind them at all. No client can see what the server returns for your account.

This account: on · anonymous baseline: on · compiled default in v2.1.236: on

Read once, for one account on one subscription tier, against v2.1.236. It isn't a statement about your account. What a flag value here can and cannot tell you

What

Each running Claude Code writes a fixed one-element feature list into its entry in the local session registry, marking itself as able to send idle notices. This is written with no flag check, so builds shipping now become discoverable as idle-capable ahead of the user-facing half.

Details
  • Sits alongside the existing peer protocol field in the same record.
  • The consumer is the subscribe path, gated behind tengu_harbor_kite (fallback false), which refuses when the target does not advertise the feature and says "that session runs a version without idle notices".
  • The reader only records the field when it parses as an array, so older peers without it degrade rather than break.
Evidence

peerFeatures

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 v2.1.236 →