MessageDisplay API
July 14, 2026 · View on GitHub
Available when inheriting from ClaudeHooks::MessageDisplay:
Runs when a message is about to be displayed. Can override the displayed text via hookSpecificOutput.displayContent.
Input Helpers
| Method | Description |
|---|---|
turn_id | ID of the current turn |
message_id | ID of this message |
index | Position of this message in the turn |
final | Whether this is the final message chunk (true/false) |
delta | The incremental text content of this message |
message_text | Alias for delta |
Hook State Helpers
| Method | Description |
|---|---|
display_content!(text) | Override the displayed text for this message |
Output Helpers
| Method | Description |
|---|---|
output.display_content | Get the overridden display content (if set) |
Hook Exit Codes
Exit code and output stream are ignored for MessageDisplay. The only honored output is hookSpecificOutput.displayContent.