> ## Documentation Index
> Fetch the complete documentation index at: https://docs.abv.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Comments on Objects

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

# 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

# Adding Comments

## 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

<Info>
  Comment authors can only delete their own comments. Project admins cannot delete other users' comments through the UI.
</Info>

## With API

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

```bash theme={null}
POST /api/public/comments
```