title: "Annotate Last" description: "The /plannotator-last slash command for annotating the agent's most recent message." sidebar: order: 13 section: "Commands"
The /plannotator-last command opens the agent's most recent response in the annotation UI, letting you highlight text, add comments, and send structured feedback back.
Usage
Claude Code
/plannotator-last
OpenCode
/plannotator-last
Pi
/plannotator-last
Codex
!plannotator last
How it works
User runs /plannotator-last
↓
Last assistant message extracted from session
↓
Annotate server starts (random port)
↓
Browser opens, loads annotation UI
↓
/api/plan returns { plan: message, mode: "annotate-last" }
↓
User annotates → Send Annotations
↓
Feedback sent to agent
Session log parsing
Each harness reads the last assistant message differently:
| Harness | Source | Method |
|---|---|---|
| Claude Code | ~/.claude/projects/{slug}/*.jsonl | Parses JSONL session logs, finds last assistant text blocks |
| OpenCode | SDK | client.session.messages() API |
| Pi | SDK | ctx.sessionManager.getEntries() API |
| Codex | ~/.codex/sessions/ rollout files | Parses JSONL by CODEX_THREAD_ID env var |
For Claude Code, the parser handles streamed chunks (multiple JSONL lines sharing the same message.id), filters out system-generated user messages, and skips noise entries. If the most recent session log has no assistant messages, it tries earlier logs sorted by modification time.
Annotate-last mode differences
The annotation UI in annotate-last mode works the same as /plannotator-annotate, with minor copy changes:
- Copy button shows "Copy message" instead of "Copy plan"
- Completion screen says "annotations on the message"
- Feedback export is titled "Message Feedback" instead of "Plan Feedback"
Server API
The annotate-last mode reuses the same annotate server endpoints. See the annotate docs.
Environment variables
Same as plan review. See the environment variables reference.