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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

A hook can hold back a Claude Desktop send

You'll notice
Useful2 Signal3
Claude Desktop

You get a clear message when a hook blocks a Claude Desktop send, which can't be resumed.

What

If a hook defers the Claude Desktop messaging tool mid-forward, Claude Code now says "a hook deferred Claude Desktop's messaging tool, so nothing was sent" and warns that a forwarded send cannot be resumed later.

Details
  • Reachable on any run of the Claude Desktop forwarding path.
Evidence

a hook deferred Claude Desktop's messaging tool, so nothing was sent

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 v2.1.251 →