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Hallmark

Hallmark is an agent skill (a SKILL.md file) from Nutlope/hallmark. Design skill for websites and new pages that look designed, not generated. It works with Claude Code, Codex, Cursor, GitHub Copilot and OpenCode and has 34,612 GitHub stars. Install it by copying the skill folder into your agent's skills directory.

github.com/Nutlope/hallmark/skills/hallmark (opens in a new tab)

Data as of from the GitHub API and skills.sh; description from the skill's SKILL.md. Report an error

View on GitHub (opens in a new tab)View on skills.sh (opens in a new tab)

Add this skill

Claude

This repository is a Claude Code plugin marketplace. In Claude Code:

/plugin marketplace add Nutlope/hallmark
/plugin install hallmark@hallmark

In the Claude apps, zip the hallmark folder and upload it under Customize > Skills > + > Upload a skill (code execution must be on).

ChatGPT / Codex

Codex reads skills from .agents/skills/ in a repo or ~/.agents/skills/ for every project:

git clone --depth 1 https://github.com/Nutlope/hallmark.git
cp -r hallmark/skills/hallmark .agents/skills/hallmark   # repo; ~/.agents/skills for all projects

Standalone skills also load in the ChatGPT desktop app.

Cursor

Cursor loads skills from .cursor/skills/ (or ~/.cursor/skills/) and also reads .claude/skills/:

git clone --depth 1 https://github.com/Nutlope/hallmark.git
cp -r hallmark/skills/hallmark .cursor/skills/hallmark   # project; ~/.cursor/skills for all projects

Source (checked Oct 7, 2026): code.claude.com/docs/en/skills (opens in a new tab), code.claude.com/docs/en/plugin-marketplaces (opens in a new tab), support.claude.com/en/articles/12512180-using-skills-in-claude (opens in a new tab), learn.chatgpt.com/docs/build-skills (opens in a new tab), cursor.com/docs/context/skills (opens in a new tab)

What this skill does

Design skill for websites and new pages that look designed, not generated. Use when the user asks to build or design something new, or names Hallmark. Never use it on an existing design unless the user names Hallmark, as in /hallmark redesign . Makes the UIs a coding assistant generates look made, not generated: a hard floor against the defaults every model was trained into, a dealt direction so consecutive builds do not converge, one idea per screen.

When it triggers

  • Use when the user asks to build or design something new, or names Hallmark.
  • use it on an existing design unless the user names Hallmark, as in /hallmark redesign .

Similar skills

More design & frontend skills

All Design & frontend

FAQ

Hallmark FAQ

Still curious? Email info@appsgit.com.

How do I install the Hallmark skill?

In Claude Code, run /plugin marketplace add Nutlope/hallmark and then /plugin install hallmark@hallmark. For Codex or Cursor, copy the hallmark folder into .agents/skills/ or .cursor/skills/.

Is the Hallmark skill free?

Yes. The repository is open source under the MIT license. The skill mentions an API key or token for an external service, which may need its own account.

Is Hallmark maintained?

The repository's most recent commit was on Oct 22, 2026. appsgit only lists skills from repositories with a commit in the last six months.