Plannotator · 2026-11-13 · notable
Plannotator — review your coding agent's plans and diffs in a browser
In short
Plannotator is an open-source local review tool for coding agents. You annotate an agent's plan, diff or HTML output in the browser and send the feedback back. Version 0.28.64 shipped on 13 November as the repo trends on GitHub.
Plannotator · 2026-11-13 · 2 sources checked
Plannotator gives coding agents a browser review screen, so you mark up a plan or diff instead of arguing in chat.
Key specs
| GitHub stars | 11,106 |
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What is it?
Plannotator opens an agent's proposed plan, finished diff, documents or HTML artifacts in a local browser window where you annotate, approve or deny. It also has an Inbox, one window where agents send questions and files. It works with Claude Code, Codex, Gemini CLI, OpenCode, Pi, Copilot CLI and other agents.
How does it work?
For plan review, a hook catches the agent's plan step (ExitPlanMode in Claude Code), starts a local server and opens the review UI; a denial sends your notes back as structured feedback and the agent revises. Code review captures local changes or a pull request URL, and other agents can join the Inbox over MCP.
Why does it matter?
Pointing at the exact line you disagree with is faster than retyping objections in a terminal. The 0.28.64 release adds smaller compressed installers checked against the same SHA-256 checksum, pull request images and videos in the Inbox, and separate GitLab file threads. The project has no telemetry.
Who is it for?
developers who run coding agents
Try it
curl -fsSL https://plannotator.ai/install.sh | bash