Constraint
Use this skill whenever the design must structurally prevent invalid actions — input validation, disabled states, required fields, type-restricted inputs, mode locks, role-based gates, hardware lockouts. Trigger when designing forms, picking input types, designing destructive flows, gating multi-step procedures, or thinking about how to prevent a class of errors from being possible at all. Constraint is one of the foundational principles in ''Universal Principles of Design'' (Lidwell, Holden, Butler 2003) and one of the strongest design moves available — preventing wrong actions is more powerful than detecting them after the fact.
Security AStatic scan found no risk patternsHow grading works ›
From the source SKILL.md
A constraint is anything that limits the actions a user can perform on a system. Some constraints are physical (you can't insert a USB-C connector upside-down because the shape rejects it). Some are psychological (you don't try to push a door labeled "PULL" because the convention overrides the impulse). Both kinds work upstream of error: instead of catching wrong actions after they happen, constraints make wrong actions hard or impossible.
What this skill does
Constraint is a community-contributed Claude Code skill in the general-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/constraint/ and loads when your prompt matches the skill's trigger.
Who uses this skill
The Constraint Claude Code skill is built for Claude Code users and developers across all disciplines looking for general-purpose AI assistance. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 178,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).
How to install
Free
Manual install (2 steps)
mkdir -p ~/.claude/skills/constraint
curl -L https://claudskills.com/skills/constraint/SKILL.md \
-o ~/.claude/skills/constraint/SKILL.md
Or just download SKILL.md directly and drop it into ~/.claude/skills/constraint/. Claude Code auto-discovers it on next session.
Skills live at ~/.claude/skills/constraint/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\constraint\SKILL.md on Windows. See the full install guide for step-by-step instructions.
Telegram
📱 Install from your phone or desktop Telegram
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 →
Pro
One-click install via the desktop app
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.
Pro
For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.
Frequently asked questions
How do I install the Constraint Claude Code skill?
Install via the ClaudSkills desktop app (one click) or copy
SKILL.md from the source repository to
~/.claude/skills/constraint/SKILL.md and restart Claude Code. Both flows are detailed at
claudskills.com/install/.
What does the Constraint skill do?
Use this skill whenever the design must structurally prevent invalid actions — input validation, disabled states, required fields, type-restricted inputs, mode locks, role-based gates, hardware lockouts. Trigger when designing forms, picking input types, designing destructive flows, gating multi-step procedures, or thinking about how to prevent a class of errors from being possible at all. Constraint is one of the foundational principles in ''Universal Principles of Design'' (Lidwell, Holden, Butler 2003) and one of the strongest design moves available — preventing wrong actions is more powerful than detecting them after the fact.
Is this skill free to install?
Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.
When should I use the Constraint skill?
Use Constraint when your Claude Code task falls under the General category — specifically in the general misc area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Constraint" or describe the task and let Claude pick). Browse related skills at
/category/general/.
What is a Claude Code skill and how does the Constraint skill fit in?
A Claude Code skill is a
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. Constraint is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the General category. Learn more at
/learn/what-is-a-claude-skill/.
Attribution & license
Cite this skill
If you reference this skill in a blog post, paper, or documentation, you can cite it as:
APA
Alex0nder. (2026). Constraint [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/constraint/
BibTeX
@misc{constraint-2026,
author = {Alex0nder},
title = {Constraint [Claude Code skill]},
year = {2026},
publisher = {ClaudSkills},
url = {https://claudskills.com/skills/constraint/}
}Embed this skill
Promote, attribute, or link this skill from your own README, blog post, or documentation. All three snippets are free to use — no sign-up, no API key. More distribution surfaces →
Badge
[](https://claudskills.com/skills/constraint/?utm_source=badge&utm_medium=readme&utm_campaign=skill_badge)
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Security scan
Grade A · scanned 2026-08-07 — free static scan against the OWASP Agentic Skills Top 10.
No risk patterns were found in any of the ten OWASP-aligned categories. How grading works ›
- ✓ Prompt injection
- ✓ Data exfiltration
- ✓ Supply chain
- ✓ Reverse shell
- ✓ Credentials
- ✓ Execution
- ✓ Filesystem
- ✓ Persistence
- ✓ Obfuscation
- ✓ Network
Show this grade on your repo (click to copy):
[](https://claudskills.com/skills/constraint/#security)
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