MessageDisplay
A Claude Code hook event, read out of the shipped bundle. No mined inventory carries it: everything below comes from what this site has written about it.
While assistant message text is displayed
Anthropic's own wording. Read off Hooks reference, captured 2026-10-22.
In the changelogs
3Releases whose published page names MessageDisplay.
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v2.1.271
Hook-exec keepalive for remote/CCR sessions
Remote and CCR sessions now hold a keepalive open while certain hooks are running
found in this entry's text
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v2.1.271
Hook-dispatch keepalive hold, gated off by default
A new keepalive mechanism can keep remote hook connections open during slow hooks, off by default
found in this entry's text
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v2.1.269
MessageDisplay hooks can now rewrite already-streamed text ('live' rewriting)
MessageDisplay hooks can now rewrite text already streamed to the screen, not just append to it
found in this entry's text
First cited
0No release's published evidence quotes this name. The ledger indexes the Evidence lines of every changelog on this site, so this says nobody here has ever quoted it; it says nothing about how old the name is.
Presence across releases
0The miner has never read a build containing this name. It is here because a changelog entry of ours names it, which is evidence that it existed and not evidence of which releases carried it. The inventory starts at v2.1.138 and everything older than that was never mined.
Read out of the published npm bundle release by release, and out of Anthropic's own documentation as this site captured it. Nothing on this page is a description anybody here wrote about what the hook event does. All hook events.