Plannotator
Visual review and annotation tool for AI coding agent plans and code.
About Plannotator
Plannotator is a local, browser-based review tool designed for AI coding agents to annotate and review plans before execution. The tool enables users to review agent-written code with a full diff viewer, annotate agent plans visually, and send structured feedback directly back to the agent. It works with multiple coding agents including Claude Code, OpenCode, Pi, Codex, Copilot CLI, Gemini CLI, and others. Plannotator runs locally on your machine without requiring external infrastructure or databases, with sharing functionality that compresses plans and annotations directly into URLs. The tool is free and open-source under MIT or Apache 2.0 licensing. One limitation is that it requires manual installation and integration setup, which may create friction for users unfamiliar with command-line tools or plugin ecosystems.
At a glance
- Platforms
- Web, VS Code, macOS, Linux
- Integrations
- Claude Code, OpenCode, Pi, Codex, Copilot CLI, Gemini CLI, Kiro, Droid
- Last verified
- June 2026
Who It's For
- •AI developers working with coding agents
- •Teams using autonomous code generation tools
- •Developers wanting to review and control AI agent output
- •Enterprises requiring code review for AI-generated code
- •DevOps and platform engineers managing AI agent workflows
How It Works
- 1Automatically opens a browser-based UI when an AI coding agent finishes generating a plan
- 2Captures agent-generated plans and code diffs for visual review
- 3Allows users to annotate and markup plans using a visual interface
- 4Compresses plans and annotations into shareable URLs without requiring backend servers
- 5Sends feedback back to the agent through native hooks and integrations
- 6Runs entirely locally on the user's machine for privacy
How to Use Plannotator
- 1Run the installation script: curl -fsSL https://plannotator.ai/install.sh | bash
- 2For Claude Code users: Add the plugin via /plugin marketplace add backnotprop/plannotator
- 3Install the plugin: /plugin install plannotator@plannotator
- 4Restart Claude Code to activate the hooks
- 5When your agent generates a plan, Plannotator opens automatically
- 6Review the plan and code diffs in the visual interface
- 7Annotate and markup as needed
- 8Share via URL if collaborating with your team
- 9Submit feedback which goes directly back to the agent
Key Features
- •Visual plan review interface
- •Code diff viewer for agent-written code
- •Plan annotation and markup tools
- •URL-based sharing without infrastructure
- •Local execution with no external dependencies
- •Native integration with coding agents via plugins and hooks
- •VS Code integration
- •Support for multiple AI agents (Claude Code, OpenCode, Pi, Codex, Copilot, Gemini, Kiro, Droid, Amp)
- •Feedback mechanism to send comments back to agents
- •Team collaboration features
Use Cases
- •Reviewing AI-generated coding plans before agent execution
- •Team collaboration on agent-generated code and plans
- •Quality control and code review for autonomous coding agents
- •Real-time feedback loop between humans and AI coding agents
- •Parallel workflow management when multiple agents are running
Pros & Cons
Advantages
- •Runs entirely locally with no external servers or databases, ensuring privacy and data security
- •Free and open-source under MIT or Apache 2.0 licensing, reducing costs and allowing community contributions
- •Native integration with multiple leading AI agents (Claude Code, OpenCode, Pi, Codex) through plugins and hooks
- •Shareable via compressed URLs without requiring backend infrastructure or third-party services
Disadvantages
- •Requires command-line installation and plugin setup, which may be a barrier for non-technical users
- •Limited to agents that support plan mode, excluding other types of AI coding tools
- •Being open-source, ongoing support and maintenance depend on community contributions rather than a dedicated company
Alternatives
See all Plannotator alternatives →- Cursor AI
- Code Assist
- CodeMate AI
- GitHub Copilot with Code Review features
- JetBrains AI Assistant
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Frequently Asked Questions
What is Plannotator?
Plannotator is a local, browser-based review tool designed for AI coding agents to annotate and review plans before execution. The tool enables users to review agent-written code with a full diff viewer, annotate agent plans visually, and send structured feedback directly back to the agent.
How much does Plannotator cost?
Plannotator uses custom pricing — contact the vendor for a quote.
Is Plannotator free?
Plannotator is a paid tool and does not offer a free plan.
What are the best Plannotator alternatives?
Popular Plannotator alternatives include Cursor AI, Code Assist, CodeMate AI.
What is Plannotator used for?
Plannotator is commonly used for Reviewing AI-generated coding plans before agent execution, Team collaboration on agent-generated code and plans, Quality control and code review for autonomous coding agents.
What platforms does Plannotator support?
Plannotator is available on Web, VS Code, macOS, Linux.
Information Accuracy
Please note: While we regularly update all tool information including descriptions, features, pricing, and other details, this information may change over time as tools evolve and update their offerings. For the most current and accurate information, we recommend visiting the official website directly. Our goal is to provide you with comprehensive and up-to-date information to help you make informed decisions.