Plannotator

Interactive Plan Review for AI Coding Agents. Mark up and refine your plans using a visual UI, share for team collaboration, and seamlessly integrate with Claude Code, OpenCode, and Pi.

Claude Code Watch Demo

OpenCode Watch Demo

Features

Visual Plan Review	Built-in hook	Approve or deny agent plans with inline annotations
Plan Diff	Automatic	See what changed when the agent revises a plan
Code Review	/plannotator-review	Review git diffs with line-level annotations
Annotate Any File	/plannotator-annotate	Annotate any markdown file and send feedback to your agent

Sharing Plans

Plannotator lets you privately share plans, annotations, and feedback with colleagues. For example, a colleague can annotate a shared plan, and you can import their feedback to send directly back to the coding agent.

Small plans are encoded entirely in the URL hash — no server involved, nothing stored anywhere. The data never leaves your browser.

Large plans use a short link service with end-to-end encryption. Your plan is encrypted with AES-256-GCM in your browser before it's uploaded — the server stores only ciphertext it cannot read. The decryption key lives only in the URL you share and is never sent to the server. Pastes auto-delete after 7 days.

• Zero-knowledge storage — not even the service operator can read stored plans (similar to PrivateBin)
• No accounts, no tracking, no cookies on the share portal
• Fully open source and self-hostable (see docs)

Note

Short links are end-to-end encrypted. A single-use AES-256-GCM key is generated in your browser via the Web Crypto API, used to encrypt the plan, and embedded in the URL fragment (#key=...). The key never leaves the browser — it is never sent to the paste service or any server. Only someone with the exact URL can decrypt the plan.

Install

• Claude Code
• OpenCode
• Pi

Install for Claude Code

Install the plannotator command:

macOS / Linux / WSL:

curl -fsSL https://plannotator.ai/install.sh | bash

Windows PowerShell:

irm https://plannotator.ai/install.ps1 | iex

Then in Claude Code:

/plugin marketplace add backnotprop/plannotator
/plugin install plannotator@plannotator

# IMPORTANT: Restart Claude Code after plugin install

See apps/hook/README.md for detailed installation instructions including a manual hook approach.

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Install for OpenCode

Add to your opencode.json:

{
  "plugin": ["@plannotator/opencode@latest"]
}

Run the install script to get /plannotator-review:

curl -fsSL https://plannotator.ai/install.sh | bash

Windows:

irm https://plannotator.ai/install.ps1 | iex

This also clears any cached plugin versions. Then restart OpenCode.

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Install for Pi

pi install npm:@plannotator/pi-extension

Then start Pi with --plan to enter plan mode, or toggle it during a session with /plannotator.

See apps/pi-extension/README.md for full usage details, commands, and flags.

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How It Works

When your AI agent finishes planning, Plannotator:

1. Opens the Plannotator UI in your browser
2. Lets you annotate the plan visually (delete, insert, replace, comment)
3. Approve → Agent proceeds with implementation
4. Request changes → Your annotations are sent back as structured feedback

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License

Copyright 2025-2026 backnotprop

This project is licensed under either of

• Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (http://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in this project by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.