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Plannotator
Plannotator is an open-source review tool for AI coding agents to annotate plans, review code diffs, and send feedback.
Plannotator is an open-source review tool designed for AI coding agents such as Claude Code, OpenCode, Codex, Pi, and Droid. It intercepts agent approval steps to provide a visual workspace for reviewing and annotating plans and code diffs before execution or commit. Users can select text to mark deletions, add inline comments, write replacements, and navigate file trees with side-by-side or unified diff views. The tool automatically exports structured feedback back to the agent without manual copy-pasting. It also offers a hosted workspace layer for teams to share plans, review histories, and verification standards.
Plannotator at a glance
- Best for: Software engineer
- Runs on: Web, VS Code
- Pricing: Free, open-source
- Released: December 2025
- Category: AI coding tool
- Website: plannotator.ai
Key features
- Inline comments on any plan section
- Mark deletions to remove scope
- Version history tracking for plan revisions
- Side-by-side or unified diff view
- File tree navigation
- Line-level annotations with code suggestions
- Stage or unstage files before committing
Use it for
- Review and annotate AI coding agent plans before execution
- Examine agent-written code using a PR-style diff viewer
- Send structured feedback directly to coding agents
- Share agent plans and review histories with team members
Alternatives to Plannotator
- Reviewer Agent — It uses a separate AI model to review code and prevent premature agent stopping.
- Crit — It keeps human feedback localized and precise for AI agent code iterations.
- jevgrep — Reduces coding agent costs by providing targeted, relevant repository context.
- CodeGraph — It eliminates file crawling, reducing AI agent tool calls by 88% and cutting costs.
- OpenCode — Works with 75+ model providers, local models, and existing subscriptions
- pstack — Improves AI coding agent outcomes with rigorous workflows.
- agent.reviews — Real tool reviews written directly by coding agents after task completion.
- Agentation — It translates clicks into CSS selectors and source paths for agents.
- Traycer — Keeps AI agents aligned with structured specs and task lists.
- Cline — Open source, any model, with approval on every step
- AGENTS.md — It separates agent-specific instructions from human-focused README files.
- Entelligence AI — Inspect agent sessions locally without digging through logs or sharing data.
All Plannotator alternatives