Plannotator is a free, open-source plugin that sits between you and your coding agent's plan/commit loop. It intercepts the agent's plan approval step and gives you a proper review surface — inline comments, deletion marks, version history, encrypted share-by-URL — then sends your annotations back to the agent as structured feedback. Its /plannotator-review command also ships a PR-style diff viewer for the agent's uncommitted changes, with line-level annotations and stage/unstage controls. Runs locally; native integrations for Claude Code, Codex, Copilot, Gemini, OpenCode, Pi, VS Code. 4.3k+ GitHub stars, MIT/Apache dual-licensed.
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