plan-design-review

plan-design-review is a skill for Claude Code, Codex from GCWing/BitFun. It costs 102 tokens per session (12,662 once invoked), scanned B, original, MIT.

An interactive review of a planned interface, focused on visual quality, usability, accessibility, responsive behavior, and missing decisions. It evaluates each area and updates the plan with improvements.

In plain words
What is it for?
Reviewing a design plan, identifying risks and edge cases, and adding concrete design decisions before implementation.
Why use it?
It finds design gaps before developers build the interface. This helps prevent problems such as unclear hierarchy, poor mobile layouts, or difficult keyboard use.

Skill for Claude CodeCodex

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/gcwing/bitfun/gstack-plan-design-review
Any agent
npx skills add GCWing/BitFun --skill gstack-plan-design-review
Clone the repo
git clone --depth 1 https://github.com/GCWing/BitFun

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for plan-design-review

README.md
[![agentmods](https://agentmods.dev/badge/skills/gcwing/bitfun/gstack-plan-design-review.svg)](https://agentmods.dev/skills/gcwing/bitfun/gstack-plan-design-review)
Your own site
<a href="https://agentmods.dev/skills/gcwing/bitfun/gstack-plan-design-review"><img src="https://agentmods.dev/badge/skills/gcwing/bitfun/gstack-plan-design-review.svg" alt="Measured on agentmods" height="20"></a>
Per session 102 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 12,662 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 2 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00102 $0.12662
Opus 5 $0.00051 $0.06331
Sonnet 5 $0.00020 $0.02532
Haiku 4.5 $0.00010 $0.01266

Measured 3d ago against content hash 93f6e87ddd4e, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade B, and why

plan-design-review scanned grade B with 2 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Sends data to an external URLmediumData exfiltration

A POST to an outside endpoint may be telemetry or may be exfiltration; either way the mod talks to somewhere, and you should know where.

`curl -s -X POST http://127.0.0.1:PORT/api/reload -H 'Content-Type: application/json' -d '{"html":"$_DESIGN_DIR/design-board.html"}'`

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

`curl -s -X POST http://127.0.0.1:PORT/api/reload -H 'Content-Type: application/json' -d '{"html":"$_DESIGN_DIR/design-board.html"}'`
src/crates/assembly/core/builtin_skills/gstack-plan-design-review/SKILL.md · 887 lines

How it starts

The opening of the file, as written. The whole thing — 887 lines — stays where its author put it; the contents beside it link to each section on GitHub.

/plan-design-review: Designer's Eye Plan Review

You are a senior product designer reviewing a PLAN — not a live site. Your job is to find missing design decisions and ADD THEM TO THE PLAN before implementation.

The output of this skill is a better plan, not a document about the plan.

BitFun Team Mode Dispatch

When this skill is invoked by BitFun Team Mode, this skill supplies the design-review lens. Use existing Task sub-agents for independent UI/UX discovery only when they add evidence, then keep design decisions in the main Team session.

  • Do not assume a Designer sub-agent exists. Choose only from the Task tool's available agents.
  • Prefer a matching custom design/frontend/accessibility sub-agent if available; otherwise use Explore for component/style-system discovery and FileFinder for design docs, screenshots, routes, styles, and UI tests.
  • Use ComputerUse only when the review needs browser/desktop inspection and it is available.
  • Keep Task work read-only before Build. Ask for hierarchy gaps, edge cases, accessibility risks, responsive concerns, existing design conventions, and screenshots/paths when relevant.
  • In parallel plan-review batches, return a compact Design brief: UX blockers, visual/system risks, required states, accessibility notes, plan edits.

Design Philosophy

You are not here to rubber-stamp this plan's UI. You are here to ensure that when this ships, users feel the design is intentional — not generated, not accidental, not "we'll polish it later." Your posture is opinionated but collaborative: find every gap, explain why it matters, fix the obvious ones, and ask about the genuine choices.

Do NOT make any code changes. Do NOT start implementation. Your only job right now is to review and improve the plan's design decisions with maximum rigor.

The BitFun image/design capability — YOUR PRIMARY TOOL

You have the BitFun image/design capability, an AI mockup generator that creates real visual mockups from design briefs. This is your signature capability. Use it by default, not as an afterthought.

Read the full file on GitHub · 887 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 3d ago First seen · 887 lines · 102 tokens per session scan B 93f6e87ddd4e

Subscribe to this mod's changes

plan-design-review is a skill published in the GitHub repository GCWing/BitFun (1,871 stars, last pushed 3d ago), licensed MIT. It adds 102 tokens to every session and 12,662 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it B with 2 findings (sends data to an external url, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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