pixel-diff

An image comparison tool that checks two screenshots pixel by pixel and creates an overlay showing where they differ.

In plain words
What is it for?
It helps compare Figma designs with web implementations and inspect screenshot changes.
Why use it?
It makes visual differences easier to find than checking two screenshots by eye.

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/mukiwu/muki-ai-plugins/pixel-diff
Any agent
npx skills add mukiwu/muki-ai-plugins --skill pixel-diff
Clone the repo
git clone --depth 1 https://github.com/mukiwu/muki-ai-plugins

Made for: Claude Code, Codex.

Per session 30 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 869 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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.

ModelPer sessionOnce invoked
Fable 5 $0.00030 $0.00869
Opus 5 $0.00015 $0.00434
Sonnet 5 $0.00006 $0.00174
Haiku 4.5 $0.00003 $0.00087

Measured 2d ago against content hash a698fafa10ae, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

pixel-diff 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 2d 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.

plugins/figma-visual-reviewer/skills/pixel-diff/SKILL.md · 64 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

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.

  1. 2d ago First seen · 64 lines · 30 tokens per session scan A a698fafa10ae

Subscribe to this mod's changes

pixel-diff is a skill published in the GitHub repository mukiwu/muki-ai-plugins (58 stars, last pushed 1mo ago), with no licence file. It adds 30 tokens to every session and 869 once invoked, about $0.0002 per session on Opus 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.