What is design-critic?

A design review agent that checks screens for generic AI-made patterns, brand rules, accessibility, and behavior on different screen sizes.

Reviewing a new dashboard screen with a designer as part of a Design Gate.

It catches visual, usability, and compliance problems before a design is approved.

How c0x12c/ai-toolkit configures Claude Code and Codex

Reuse

Borrowing it

Nothing to install: this file belongs to c0x12c/ai-toolkit. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/c0x12c/ai-toolkit/master/.codex/agents/design-critic.md

Clone the repo

git clone --depth 1 https://github.com/c0x12c/ai-toolkit

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.

README.md

[![agentmods](https://agentmods.dev/badge/agents/c0x12c/ai-toolkit/design-critic/github.svg)](https://agentmods.dev/agents/c0x12c/ai-toolkit/design-critic)

Your own site

<a href="https://agentmods.dev/agents/c0x12c/ai-toolkit/design-critic"><img src="https://agentmods.dev/badge/agents/c0x12c/ai-toolkit/design-critic/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/agents/c0x12c/ai-toolkit/design-critic"><img src="https://agentmods.dev/badge/agents/c0x12c/ai-toolkit/design-critic.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 143 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 1,127 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin unknown 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.

Model	Per session	Once invoked
Fable 5.1	$0.00143	$0.01127
Opus 5.5	$0.00057	$0.00451
Sonnet 5.5	$0.00029	$0.00225
Haiku 4.5	$0.00014	$0.00113

Measured 2mo ago against content hash cf2aa07ff0b8, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

design-critic scanned grade A with 0 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 2mo 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.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.codex/agents/design-critic.md · 128 lines

The source is not reproduced here

No licence file

Read it on GitHub

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.

2mo ago First seen · 128 lines · 143 tokens per session scan A cf2aa07ff0b8

Subscribe to this mod's changes

design-critic is an agent published in the GitHub repository c0x12c/ai-toolkit (110 stars, last pushed 4mo ago), with no licence file. It adds 143 tokens to every session and 1,127 once invoked, about $0.0006 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

Design and UX

design-critic next to 6 agents from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
design-criticc0x12c/ai-toolkit	Agent	110	4mo ago	none	A	143	Claude Code, Codex
ux-flow-auditorCharlesWiltgen/Axiom	Agent	1.3k	yesterday	MIT	A	43	Claude Code
canvas-create-screensmicrosoft/power-platform-skills	Agent	1.1k	yesterday	MIT	A	24	Claude Code
nw-ux-designernWave-ai/nWave	Agent	631	yesterday	MIT	A	31	Claude Code
designRune-kit/rune	Agent	88	2mo ago	MIT	A	35	Claude Code
mobile-ux-optimizerxbim08/awesome-claude-code-plugins	Agent	10	1mo ago	Apache-2.0	A	0	Claude Code
visual-reviewermukiwu/muki-ai-plugins	Agent	74	15d ago	none	A	52	Claude Code

ai-toolkit: Agent for Claude Code