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Comments enable teams to add contextual notes and discussions directly to traces, observations, sessions, and prompts within ABV. This feature facilitates collaboration by allowing team members to:
  • Flag issues or anomalies in specific traces
  • Share insights about particular model outputs
  • Document edge cases and debugging notes
  • Coordinate on prompt improvements
  • Leave feedback during development and review cycles

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Supported Object Types

Comments can be added to the following ABV objects:
  • Traces - Comment on complete execution flows
  • Observations - Add notes to specific LLM calls, spans, or events
  • Sessions - Discuss user interaction patterns
  • Prompts - Collaborate on prompt versions and improvements

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Adding Comments

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Via UI

Each supported object page displays a comment button in the interface. The button shows:
  • The current comment count (capped at “99+” for readability)
  • A disabled state if you don’t have read permissions
  • An active state when comments are available or you can create them
Clicking the comment button opens a side drawer containing:
  1. Comment Thread - All existing comments displayed chronologically
  2. Composer - Text area for writing new comments (if you have write permissions)
  3. Markdown Preview - Real-time preview of your formatted comment
Comment authors can only delete their own comments. Project admins cannot delete other users’ comments through the UI.

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With API

The Comments API allows programmatic access to create and retrieve comments. All endpoints follow the standard ABV API patterns. 
POST /api/public/comments