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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 v2.1.242

Messages from other clients on the same cloud session are rewritten before display

You'll notice
Useful2 Signal2
Cloud Sessions

Messages from another client on the same cloud session are trimmed to what yours can display.

What

When another client is attached to the same cloud session, its messages are not passed through as-is: content blocks this client cannot show become a placeholder and tool calls are dropped entirely.

Details
  • The number of each is reported as peer_content_omitted and peer_tool_use_omitted in the end-of-run event.
  • Frame types the client does not recognise are dropped with a warning, except for a known list of service events including synced_file_changed, mcp_auth_required and heartbeat_probe, which are dropped silently.
Evidence

[unsupported content from another client omitted]

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

See this entry in the whole of v2.1.242 →