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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 v2.1.235

Oversized cross-session messages fail with a specific error

You'll notice
Useful3 Signal2
Cross-Session Messaging

Oversized messages between sessions now fail with the actual size, the limit, and advice to use a file.

What

Sending a message between sessions that exceeds the size cap now raises a dedicated message_too_large error naming the actual character count and the limit, and suggesting you put bulk content in a file instead.

Details
  • Applies to serialized messages on the cross-session delivery path.
  • No gate; always active on that path.
Evidence

cross-session message exceeds the line cap

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 v2.1.235 →