code-agents

ai-demo-marketplace

AI Demo Marketplace — a public Claude Code plugin marketplace built for the AI Agentic Engineering workshop. It's a catalog you add once, then install shared plugins from: skills, agents, hooks, and MCP servers.

The catalog lives separately from any product — its own owner, its own release cadence. A product release must not force a plugin release, and vice versa.

This first commit is the baseline. It ships the marketplace structure and docs with an empty plugin catalog. Real plugins, a validation script, CI, and a catalog website are added stage by stage during the workshop — each on its own branch.

Add the marketplace (once)

/plugin marketplace add burnjohn/ai-demo-marketplace

Install a plugin

/plugin install <plugin-name>@ai-demo-marketplace

<plugin-name> is the name of an entry in .claude-plugin/marketplace.json; ai-demo-marketplace is the catalog name. The baseline ships with no plugins yet — the catalog fills up as the workshop progresses.

Updating (two different things)

Command	What it does
/plugin marketplace update	Refreshes the catalog — pulls the current list of available plugins/versions
/plugin update <plugin>@ai-demo-marketplace	Updates an already installed plugin to a new version

Refreshing the catalog does not update installed plugins by itself.

Repository layout

.claude-plugin/marketplace.json   # the catalog (plugin registry) — empty in the baseline
plugins/                          # each plugin in its own subdirectory (added during the workshop)
docs/PLUGIN-GUIDELINES.md         # plugin anatomy (manifest, dependencies)
docs/SECURITY.md                  # permissions, secrets policy
docs/RELEASES.md                  # SemVer, tags, update, rollback
CODEOWNERS · CONTRIBUTING.md

Workshop stages

The baseline is deliberately minimal so we can build it up live. Later branches add, roughly in order:

1. The first real plugins (a skill, a read-only agent).
2. A structural linter (scripts/validate-marketplace.mjs) — secrets / absolute-path / escape checks.
3. GitHub Actions CI (.github/workflows/validate.yml) running the linter + claude plugin validate.
4. Release/rollback helpers and a catalog website (GitHub Pages).

Contributing

Before adding a plugin, read CONTRIBUTING.md and docs/PLUGIN-GUIDELINES.md.

Principles

• Explore first, standardise later — don't over-engineer governance before 2–3 real plugins exist.
• Pin versions, don't auto-update external dependencies; update deliberately.
• Portability: keep SKILL.md compatible (Markdown + YAML frontmatter) with other agents.