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Comments on Objects

Comments enable teams to add contextual notes and discussions directly to traces, observations, sessions, and prompts within Langfuse. 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

Supported Object Types

Comments can be added to the following Langfuse 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

Adding Comments

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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