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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.

← All of v2.1.251 Home All releases ←olderv2.1.250
Claude Code v2.1.251

SendMessage can deliver to Claude Desktop sessions

Use it now
Useful3 Signal4
Messaging Notable

SendMessage can now deliver plain text to Claude Desktop sessions.

SendMessage
What

SendMessage now recognises targets that look like Claude Desktop session ids and delivers plain-text messages to them through Claude Desktop itself, alongside the existing local-socket and remote-bridge delivery paths.

Details
  • Requires Claude Desktop's own session messaging tool to be present in the session; without it the send fails as not reachable, with the message quoted below.
  • Has its own guards for empty messages and for "hop loops", where agents keep messaging each other automatically, separate from the guards on the other delivery paths.
Evidence

Claude Desktop's session messaging tool is not available in this session, so SendMessage cannot deliver to it

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

See this entry in the whole of v2.1.251 →