Stencil — Simulation Organism Plugin

The community-owned, open-source plugin behind stencil.pub. Skills, atoms, and reports contributed by Stencil essayists, accumulated into one plugin focused on simulating the physical world — Claude Code today; Codex and other coding agents to follow as those platforms mature.

Install (Claude Code)

claude plugin install stencil-pub/stencil

Codex / other agents: planned. Skills are written in plain markdown with agent-neutral frontmatter, so porting is mostly a manifest exercise. Track or contribute via GitHub Discussions.

What's in here

• skills/ — markdown-with-frontmatter skill files. Each is rendered on stencil.pub/plugin// and is also loaded by Claude Code when the plugin is installed.
• skills/_schema.json — the frontmatter schema. The website validates against the same schema at build time; CI here validates against it on every PR.

How to propose a skill

Click "Propose a skill" on stencil.pub/plugin/, or open a new file at skills/<your-slug>.md directly in this repo. The CI checks your frontmatter against the schema; once approved, the website rebuilds and your skill appears in the registry.

Anyone can propose. Members of the stencil-pub GitHub org can commit directly to main.

Where the discussion happens

• Architecture and process: Stencil journal
• Skill ideation and review: GitHub Discussions
• Issues with specific skills: GitHub Issues on this repo

License

Plugin code: MIT. Skill markdown: CC-BY-4.0. See the website About page for the full licensing stance.

The vision

See the founding essay: Toward a Simulation Organism (DOI 10.5281/zenodo.20331251).