Fat Marker Sketch includes worked examples; pricing or quota commentary; at least one code block. At roughly 2,900 words the SKILL.md is on the longer end of the catalog distribution.
Fat Marker Sketch sits in the Product category under the design-system-ui sub-topic in the ClaudSkills catalog. There are 10 related skills indexed alongside it; comparing a few before installing usually reveals which fits your workflow best.
These notes are auto-generated from features detected in the SKILL.md file and from this catalog's structure — they aren't part of the source repository.
A fat marker sketch is a crude structural drawing — as if you grabbed a thick Sharpie and sketched on a whiteboard. The thick marker physically prevents fine detail. That's the point: it forces the conversation to stay on structure and components, not pixels.
Fat Marker Sketch is a community-contributed Claude Code skill in the design-system-ui sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/fat-marker-sketch/ and loads when your prompt matches the skill's trigger.
When to invoke it: Use when someone asks to sketch, wireframe, mockup, or visually map a design before detailed design — user flows, refactors, migrations, architecture changes, integration diagrams, sequence/interaction flows, state machines, or data pipelines. Also triggers during brainstorming after an approach is selected, per the planning pipeline.
The Fat Marker Sketch Claude Code skill is built for product managers, product designers, and cross-functional teams planning, shipping, and measuring product features. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 116,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).
mkdir -p ~/.claude/skills/fat-marker-sketch curl -L https://claudskills.com/skills/fat-marker-sketch/SKILL.md \ -o ~/.claude/skills/fat-marker-sketch/SKILL.md
Or just download SKILL.md directly and drop it into ~/.claude/skills/fat-marker-sketch/. Claude Code auto-discovers it on next session.
Skills live at ~/.claude/skills/fat-marker-sketch/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\fat-marker-sketch\SKILL.md on Windows. See the full install guide for step-by-step instructions.
Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →
The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.
For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.
SKILL.md from the source repository to ~/.claude/skills/fat-marker-sketch/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Fat Marker Sketch is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Product category. Learn more at /learn/what-is-a-claude-skill/.If you reference this skill in a blog post, paper, or documentation, you can cite it as:
@misc{fat-marker-sketch-2026,
author = {ClaudSkills},
title = {Fat Marker Sketch [Claude Code skill]},
year = {2026},
publisher = {ClaudSkills},
url = {https://claudskills.com/skills/fat-marker-sketch/}
}Browse all Product skills in the ClaudSkills registry, or explore these other picks from the same category:
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SKILL.md files, not affiliated with, endorsed by, or sponsored by Anthropic.