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:
- Comment Thread - All existing comments displayed chronologically
- Composer - Text area for writing new comments (if you have write permissions)
- 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.