Add to your opencode.json:

{
  "$schema": "https://opencode.ai/config.json",
  "plugin": ["@plannotator/opencode"]
}

Restart OpenCode. The submit_plan tool is now available.

Plannotator

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

Plan Mode Demos:

Claude Code Watch Demo

OpenCode Watch Demo

New: Code Review

Features

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.

Large plans use a short link service with end-to-end encryption. Your plan is encrypted with AES-256-GCM in your browser before upload. The server stores only ciphertext it cannot read. The decryption key lives only in the URL you share. Pastes auto-delete after 7 days.

• Zero-knowledge storage, similar to PrivateBin
• Fully open source and self-hostable (see docs)

Install

• Claude Code
• OpenCode
• Pi
• Codex

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.

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.

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.

Install for Codex

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 Codex — feedback flows back into the agent loop automatically:

!plannotator review           # Code review for current changes
!plannotator review <pr-url>  # Review a GitHub pull request
!plannotator annotate file.md # Annotate a markdown file
!plannotator last             # Annotate the last agent message

Plan mode is not yet supported.

See apps/codex/README.md for details.

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

(Similar flow for code review, except you can also comment on specific lines of code diffs)

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.