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Plannotator

Hacker Approved

Plan 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%
Each figure is one person. RecommendsCriticizes

Recommended in 11 of 13 months

  1. November 2025: not recommended
  2. December 2025: recommended
  3. January 2026: recommended
  4. February 2026: recommended
  5. March 2026: recommended
  6. April 2026: recommended
  7. May 2026: recommended
  8. June 2026: recommended
  9. July 2026: recommended
  10. August 2026: recommended
  11. September 2026: recommended
  12. October 2026: recommended
  13. 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)”
  • 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”
  • 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.”

MixedComment from 30 Oct 2026 in “Chopin – A real-time multiplayer, agentic planning environment”

“part of the free/open source capability at”

RecommendsComment from 9 Oct 2026 in “Show HN: Plannotator Inbox – Decision Making Surface for Agents”

“plannotator - which I like a lot - and haven't used or felt the need to use _plan mode_ for at least 3-4 months”

RecommendsComment from 26 Sep 2026 in “Plan mode is dead”

“I just prefer a more lightweight setup and plannotator's UI which I can use to interactively review stuff.”

RecommendsComment from 26 Sep 2026 in “Plan mode is dead”

“I've built a self-hosted capability here with things like live collaboration for humans and agents.”

RecommendsComment from 19 Sep 2026 in “Cloudflare Quick Tunnels”

“instead of chats you just give something more like an inline code review”

RecommendsComment from 21 Aug 2026 in “Show HN: Huzzah – a novel approach to coding with AI”

“has a nice way to annotate agent messages or documents and its integrated into the agent chat”

RecommendsComment from 12 Aug 2026 in “Zed: Delta”

“still very useful for annotating html prototypes and markdown plans”

RecommendsComment from 9 Aug 2026 in “Ask HN: What are you working on? (August 2026)”

“my team uses plannotator for specs and code review”

RecommendsComment from 4 Aug 2026 in “Harness Engineering for Self-Improvement”

“That's where the annotation in plannotator helps.”

RecommendsComment from 5 Jul 2026 in “Shadcn/UI now defaults to Base UI instead of Radix”

“I use plannotator with claude a lot and have much better time”

RecommendsComment from 5 Jul 2026 in “Shadcn/UI now defaults to Base UI instead of Radix”

“plannotator is really nice!”

RecommendsComment from 13 Jun 2026 in “Show HN: Plannotator – annotate agent plans, diffs, and HTML”

“plannotator's made me actually want to read my agents' plans. Great product.”

RecommendsComment from 11 Jun 2026 in “Show HN: Command Center, the AI coding env for people who care about quality”

“This style is essentially exactly what my workflow is today using”

RecommendsComment from 9 Jun 2026 in “Show HN: Command Center, the AI coding env for people who care about quality”

“conduct local code reviews with Plannotator”

RecommendsComment from 5 Jun 2026 in “Ask HN: What is your (AI) dev tech stack / workflow? (June 2026)”

“I have a handful of fairly vocal and supportive engineers I stay in contact with around plannotator.ai”

RecommendsComment from 29 May 2026 in “Orchestrating AI code review at scale”

“I've effectively been enriching plan rendering in Plannotator. Now supporting GFM, custom svgs, etc.”

RecommendsComment from 10 May 2026 in “Using Claude Code: The Unreasonable Effectiveness of HTML”

“The only thing I really needed outside of the harnesses was a better plan review surface.”

RecommendsComment from 5 May 2026 in “Agent Skills”

“and Plannotator [2] to review the plans”

RecommendsComment from 4 May 2026 in “Redis array: short story of a long development process”

“I like how it let's me annotate the plan as I review and then send feedback or approve.”

RecommendsComment from 28 Apr 2026 in “Show HN: Discuss CLI – No more reviewing agent plans in the terminal”

“open source runs locally, has code review”

RecommendsComment from 17 Apr 2026 in “Show HN: Stage – Putting humans back in control of code review”

“I use it daily and so do others, for - better UX, feedback, and review surfaces for ai coding agents.”

RecommendsComment from 12 Apr 2026 in “Ask HN: What Are You Working On? (April 2026)”

“It opens the plan on a minimal web page so I can highlight and add comments.”

RecommendsComment from 3 Apr 2026 in “A Rave Review of Superpowers (For Claude Code)”

“This is a very simple tool that captures the plan through a hook (ExitPlanMode) and creates a UI”

RecommendsComment from 15 Mar 2026 in “Ask HN: How is AI-assisted coding going for you professionally?”

“I'm already fairly hooked into the planning life cycle.”

RecommendsComment from 13 Mar 2026 in “Shall I implement it? No”

“I needed a better way to actually review the plan, address certain parts, see plan diffs, etc all in a better visual way.”

RecommendsComment from 7 Mar 2026 in “LLM Doesn't Write Correct Code. It Writes Plausible Code”

“The only augment of Claude Code I have is a hook for plan mode review”

MixedComment from 2 Mar 2026 on Hacker News

“Plan Diff surfaces exactly what's different via a traditional diff view as well as nice UI”

RecommendsComment from 23 Feb 2026 in “Version History for Claude Code's Plan Mode”

“Plannotator's "Plan Diff" shows exactly what's different about the plan.”

RecommendsComment from 23 Feb 2026 in “Plan Diffs for Coding Agents”

“annotate in a nice visual, and automatically send the feedback to the agent”

RecommendsComment from 22 Feb 2026 in “How I use Claude Code: Separation of planning and execution”

“If you've ever desired the ability for annotating the plan more visually, try fitting Plannotator in this workflow.”

RecommendsComment from 22 Feb 2026 in “How I use Claude Code: Separation of planning and execution”

“Really nice ui based on the demo.”

RecommendsComment from 22 Feb 2026 in “How I use Claude Code: Separation of planning and execution”

“Plannotator does this really effectively and natively through hooks”

RecommendsComment from 22 Feb 2026 in “How I use Claude Code: Separation of planning and execution”

“That looks great! Planning phase is really key.”

RecommendsComment from 11 Feb 2026 in “Claude Code Is Being Dumbed Down”

“Annotate and review coding agent plans visually, share with your team, send feedback to the agents with one click.”

RecommendsComment from 11 Jan 2026 in “Ask HN: What Are You Working On? (January 2026)”

“to give me a better way to review & collaborate around plans”

RecommendsComment from 31 Dec 2025 in “Prof. Software Developers Don't Vibe, They Control: AI Agent Coding Use in 2025”

“it enabled me to build an interactive UX I really wanted”

RecommendsComment from 30 Dec 2025 in “Show HN: A Claude Code plugin that catch destructive Git and filesystem commands”

Counts come from 1,795,640 Hacker News comments, November 2025 to November 2026. How we count. Report a mistake.