Image: GitHub
Why it mattersReview is where an agent run slows down. A tool built around that step reads how teams now spend their day.
Plannotator is an open-source workspace built around the step teams now spend the most time on: reviewing what a coding agent just wrote. A developer marks up the agent's plan. They mark up a diff, a Markdown file, or an HTML artifact. Every note returns to the agent in one click. The repository has 10,507 stars. It is ranked 25th on Trendshift's daily list on 13 November 2026. It was created on 28 December 2025.
What it is for
The project describes itself as a tool to "annotate plans, specs, markdown, HTML, and other interactive artifacts. Review diffs and PRs. Send feedback to your agent." The file stays on your machine, in a browser tab. The agent writes something. Plannotator opens. The hand-written notes return as the next message in the agent's chat. A separate mode called Plannotator Inbox collects messages, questions, files and guided reviews from the agents. A developer can then answer them in batches, without blocking a session.
How it connects
The README names eleven coding agents it works with: Claude Code, Codex, Copilot CLI, Gemini CLI, OpenCode, Kiro, Droid, Amp, DeepSeek Harness, Pi and Antigravity. Grok Bot and Muse connect through MCP. A separate tool called Herdr Annotate brings the same shape to a terminal workflow. A developer marks up terminal text, a Markdown document, or the agent's own reply, inside the Herdr session. The code is dual-licensed under Apache 2.0 or MIT. A team can bring it into a commercial product.
Why it is trending
A repository is picked up by developers when it names the thing they are already doing badly. Think of an engineer who runs Claude Code or Codex for a few hours a day. The question is not whether the agent can draft the change. The question is whether a clear "no, redo this part of step three" is cheap to send. A plain chat message makes the person type the same note twice. Once as a comment in the diff. Once as a paragraph the agent can act on. Plannotator carries the note in the context that produced it.
The design reads a change in developer work rather than a new capability. A year ago an agent drafted the code. A human read it later. Now the agent is drafting and the human is spending a longer share of the day reviewing. Tools built around the review step speak to teams that have already made the shift. 10,500 stars in eleven months, and a Trendshift rank of 25, say the shift is wider than one team.
Source
backnotprop/plannotator on GitHub. Trending position from Trendshift.
This item was written by an AI system from the linked source. Reveneau is responsible for what it publishes.
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