Plannotator
Hacker ApprovedPlan review tool in Developer tools
Free open-source tool for reviewing AI agent plans visually, annotating them and sending feedback to the agent. Critics say it feels like an add-on rather than integrated.
Free open-source tool for reviewing AI agent plans visually, annotating them and sending feedback to the agent. Critics say it feels like an add-on rather than integrated.
19 people gave an opinion
- recommend it
- 19
- criticize it
- 0
- approval share
- 100%
Recommended in 11 of 13 months
- November 2025: not recommended
- December 2025: recommended
- January 2026: recommended
- February 2026: recommended
- March 2026: recommended
- April 2026: recommended
- May 2026: recommended
- June 2026: recommended
- July 2026: recommended
- August 2026: recommended
- September 2026: recommended
- October 2026: recommended
- November 2026: not recommended (month in progress)
Why it carries the badge
- 19 people recommend itNeeds 10 or more, met.
- Nobody criticizes itNeeds 2 to 1 or better, met.
- Recommended in 11 of 13 monthsNeeds 4 or more, met.
The same three rules apply to every product, and the badge can’t be bought. How the badge works
What people say about it
The reasons people give, with the number of comments that give each one. Open a reason to read what they said.
Why people recommend it
Each mark is one comment
Visual annotation of plans
“I needed a better way to actually review the plan, address certain parts, see plan diffs, etc all in a better visual way.”
Comment from 7 Mar 2026 in “LLM Doesn't Write Correct Code. It Writes Plausible Code” “If you've ever desired the ability for annotating the plan more visually, try fitting Plannotator in this workflow.”
Comment from 22 Feb 2026 in “How I use Claude Code: Separation of planning and execution” “Annotate and review coding agent plans visually, share with your team, send feedback to the agents with one click.”
Comment from 11 Jan 2026 in “Ask HN: What Are You Working On? (January 2026)” - Comment from 12 Aug 2026 in “Zed: Delta”
- Comment from 28 Apr 2026 in “Show HN: Discuss CLI – No more reviewing agent plans in the terminal”
- Comment from 3 Apr 2026 in “A Rave Review of Superpowers (For Claude Code)”
- Comment from 22 Feb 2026 in “How I use Claude Code: Separation of planning and execution”
- Comment from 9 Aug 2026 in “Ask HN: What are you working on? (August 2026)”
Shared review with team
“Annotate and review coding agent plans visually, share with your team, send feedback to the agents with one click.”
Comment from 11 Jan 2026 in “Ask HN: What Are You Working On? (January 2026)” “I have a handful of fairly vocal and supportive engineers I stay in contact with around plannotator.ai”
Comment from 29 May 2026 in “Orchestrating AI code review at scale” “I've built a self-hosted capability here with things like live collaboration for humans and agents.”
Comment from 19 Sep 2026 in “Cloudflare Quick Tunnels” - Comment from 31 Dec 2025 in “Prof. Software Developers Don't Vibe, They Control: AI Agent Coding Use in 2025”
- Comment from 4 Aug 2026 in “Harness Engineering for Self-Improvement”
Sends feedback back to agent
“Annotate and review coding agent plans visually, share with your team, send feedback to the agents with one click.”
Comment from 11 Jan 2026 in “Ask HN: What Are You Working On? (January 2026)” “I like how it let's me annotate the plan as I review and then send feedback or approve.”
Comment from 28 Apr 2026 in “Show HN: Discuss CLI – No more reviewing agent plans in the terminal” “annotate in a nice visual, and automatically send the feedback to the agent”
Comment from 22 Feb 2026 in “How I use Claude Code: Separation of planning and execution” Free, open source, runs locally
“I just prefer a more lightweight setup and plannotator's UI which I can use to interactively review stuff.”
Comment from 26 Sep 2026 in “Plan mode is dead” “part of the free/open source capability at”
Comment from 9 Oct 2026 in “Show HN: Plannotator Inbox – Decision Making Surface for Agents” “open source runs locally, has code review”
Comment from 17 Apr 2026 in “Show HN: Stage – Putting humans back in control of code review”
What people warn about
Each mark is one comment
Feels bolted on, not integrated
“The only augment of Claude Code I have is a hook for plan mode review”
Comment from 2 Mar 2026 on Hacker News “Plannotator is very much an appendage rather than an integrated unit.”
Comment from 30 Oct 2026 in “Chopin – A real-time multiplayer, agentic planning environment”
What people said
37 of the 44 comments that mention it, newest first. Each links to the original comment.
“Plannotator is very much an appendage rather than an integrated unit.”
“part of the free/open source capability at”
“plannotator - which I like a lot - and haven't used or felt the need to use _plan mode_ for at least 3-4 months”
“I just prefer a more lightweight setup and plannotator's UI which I can use to interactively review stuff.”
“I've built a self-hosted capability here with things like live collaboration for humans and agents.”
“instead of chats you just give something more like an inline code review”
“has a nice way to annotate agent messages or documents and its integrated into the agent chat”
“still very useful for annotating html prototypes and markdown plans”
“my team uses plannotator for specs and code review”
“That's where the annotation in plannotator helps.”
“I use plannotator with claude a lot and have much better time”
“plannotator is really nice!”
“plannotator's made me actually want to read my agents' plans. Great product.”
“This style is essentially exactly what my workflow is today using”
“conduct local code reviews with Plannotator”
“I have a handful of fairly vocal and supportive engineers I stay in contact with around plannotator.ai”
“I've effectively been enriching plan rendering in Plannotator. Now supporting GFM, custom svgs, etc.”
“The only thing I really needed outside of the harnesses was a better plan review surface.”
“and Plannotator [2] to review the plans”
“I like how it let's me annotate the plan as I review and then send feedback or approve.”
“open source runs locally, has code review”
“I use it daily and so do others, for - better UX, feedback, and review surfaces for ai coding agents.”
“It opens the plan on a minimal web page so I can highlight and add comments.”
“This is a very simple tool that captures the plan through a hook (ExitPlanMode) and creates a UI”
“I'm already fairly hooked into the planning life cycle.”
“I needed a better way to actually review the plan, address certain parts, see plan diffs, etc all in a better visual way.”
“The only augment of Claude Code I have is a hook for plan mode review”
“Plan Diff surfaces exactly what's different via a traditional diff view as well as nice UI”
“Plannotator's "Plan Diff" shows exactly what's different about the plan.”
“annotate in a nice visual, and automatically send the feedback to the agent”
“If you've ever desired the ability for annotating the plan more visually, try fitting Plannotator in this workflow.”
“Really nice ui based on the demo.”
“Plannotator does this really effectively and natively through hooks”
“That looks great! Planning phase is really key.”
“Annotate and review coding agent plans visually, share with your team, send feedback to the agents with one click.”
“to give me a better way to review & collaborate around plans”
“it enabled me to build an interactive UX I really wanted”
Counts come from 1,795,640 Hacker News comments, November 2025 to November 2026. How we count. Report a mistake.