Overview
mason is an open-source workflow skill for Claude Code and compatible agents, published by sickn33. Its author describes it as: “Produces clean, functional code that matches the architecture and checklists.”. The project has 47k stars on GitHub and is available under the MIT license. Add it to your setup with `/plugin marketplace add sickn33/agentic-awesome-skills`.
What mason does
Mason writes the code. He works strictly from Aria's blueprint and Alex's checklist — he does not invent schema, does not redesign APIs, and does not add unrequested features. His job is to produce clean, functional, production-ready code that precisely matches the architecture and satisfies every checklist item's Definition of Done.
What’s inside
The SKILL.md for mason is organised into these sections:
- When to Use
- Responsibilities
- 1. Environment & Boilerplate Setup
- 2. Core Logic Implementation
- 3. Code Quality Baseline
- 4. File-by-File Delivery
- 5. Integration Points
- 6. Security Baseline (Non-Negotiable)
- Output Format (Structured Report to Main Agent)
- Handoff Protocol
- Interaction Style
- Limitations
Installation
Add mason to your agent with:
/plugin marketplace add sickn33/agentic-awesome-skillsReview a skill’s source before installing it — skills can instruct your agent to run commands. This command comes from the skill’s public repository, which is the source of truth for setup steps. New to skills? Read how to install Claude Code skills.
Supported agents
- Claude Code — ships a claude code plugin marketplace
- Codex — declared in the repository topics
- Cursor — declared in the repository topics
- Gemini CLI — declared in the repository topics
- Antigravity — declared in the repository topics
License
mason is published under the MIT license.
Strengths
- Clear MIT license — safe to read and adapt within its terms
- Ships in sickn33/agentic-awesome-skills, an established project with 46,693 GitHub stars
- Works with Claude Code, Codex, Cursor, Gemini CLI, Antigravity
- Actively maintained — repository updated in the last 30 days
- Its repository gained 2,482 GitHub stars over the last 52 days
Author
Topics
Frequently asked questions
- What does mason do?
- Produces clean, functional code that matches the architecture and checklists.
- How do I install mason?
- Run /plugin marketplace add sickn33/agentic-awesome-skills in your agent, then reload your skills. Review the source at https://github.com/sickn33/agentic-awesome-skills before installing.
- Is mason free to use?
- Yes. mason is free and open source under the MIT license, so you can read, run, and adapt it within that license's terms.
- Which agents does mason work with?
- mason lists Claude Code, Codex, Cursor, Gemini CLI, and Antigravity — named in its SKILL.md, its plugin marketplace or its repository topics. Skills use the portable SKILL.md format, so other agents that read that format may load it too.
- Where does mason come from?
- mason ships inside sickn33/agentic-awesome-skills, a repository that contains 70 catalogued skills in total. The repository's 46,693 GitHub stars apply to that whole collection, not to this skill on its own.