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meticulous-simulate-and-diff

95 / 100 · Low risk

Fine to try. Some of what it can do is expected: a coding skill usually runs build and test commands.

By CognitionAI/devin-marketplace (GitHub) · coding · 27 stars · scanned at commit 9836d94

Run a Meticulous session simulation against a live URL and analyze the visual output — either by inspecting screenshots directly (quick-check mode) or by comparing pixel and HTML diffs against a base replay. Use when checking whether a code change has introduced visual regressions for a specific session.

Works with any agent that supports SKILL.md skills.

What this skill can do

Install

Paste this into your terminal. It downloads exactly the version we scanned, not whatever is newest.

if [ -e ~/.agents/skills/'meticulous-simulate-and-diff' ] || [ -L ~/.agents/skills/'meticulous-simulate-and-diff' ]; then echo 'A skill folder named meticulous-simulate-and-diff already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/CognitionAI/devin-marketplace' "$d" && git -C "$d" checkout --quiet '9836d94e88404aabb682086405c2aa9cba7657ac' -- 'plugins/meticulous/skills/meticulous-simulate-and-diff' && mkdir -p ~/.agents/skills && cp -R "$d"/'plugins/meticulous/skills/meticulous-simulate-and-diff' ~/.agents/skills/'meticulous-simulate-and-diff' && rm -rf "$d"; fi

Codex reads ~/.agents/skills directly. For Claude Code, Cursor, Copilot, Gemini CLI, Antigravity or OpenCode, also link it. For Claude Code: ln -s ~/.agents/skills/'meticulous-simulate-and-diff' ~/.claude/skills/'meticulous-simulate-and-diff' (other agents: ~/.cursor/skills, ~/.copilot/skills, ~/.gemini/skills, ~/.gemini/config/skills, ~/.config/opencode/skills). Or install through the finder skill, which does both.

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