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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
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Claude Code v2.1.248 ·

Cross-session peers accept reply sockets in the standard socket directories

Sessions accept reply sockets in any standard socket directory, not just their own.

Under the hood No documentation found New Features
JSON All of v2.1.248
Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
Cross-Session MessagingArea: what it touches
New FeaturesKind: in v2.1.248,
New FeaturesSection of the release
What

Claude Code sessions on one machine talk over local sockets. A session now tells its peers it can handle a reply socket living in any of the standard socket directories, not only the exact directory its own socket sits in. On by default on macOS and Linux; never on Windows.

Details
  • The handshake advertises a third capability string, reply_across_default_dirs, alongside the existing notify-idle and artifact-yield ones.
  • Accepted directories are matched by fixed patterns for /tmp/cc-socks, /private/tmp/cc-socks, /run/user/<uid>/cc-socks and the Termux tmp path, and the uid component must match the listener's own uid list.
  • The receiving side accepts cross-directory replies when the peer process id was verified through peer credentials.
  • No remote config flag: it is advertised whenever the platform is not Windows and the runtime exposes Bun.ant.getPeerPid.
Evidence

reply_across_default_dirs

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

Read from
Names in the bundle/run
Since it was published

The entry above is what we published on the day. These lines were added later, as Anthropic's own pages caught up, and they sit beside the original rather than replacing it.

Confirmed since Anthropic's documentation has since written up /run, on Claude Science changelog. * Claude Science is now available for Windows: download it from [claude.com/product/claude-science](https://claude.com/product/claude-science), and see [Run on Windows](/docs/claude-science/run-on-windows) for requirements and setup claude-science/changelog see the edit
How sure we are
Two sources agreeTwo things we can check say the same as this entry.
Anthropic's documentation agreesAnthropic's documentation has since written up /run, on Claude Science changelog.
Anthropic's release notes agreeImproved cross-session messaging: falls back to a private per-user /tmp directory when the default one can't be used, and the notice and…

See this entry in the whole of v2.1.248 →

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