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Adds a new skill for creating, managing, and adopting plugins across Claude Code and GitHub Copilot CLI marketplaces. Includes three Bash scripts (inventory, gen_manifests, validate), three reference docs (cross-compat, claude-code, copilot-cli), a test harness with 18 passing tests, and an eval.yaml. Also adds the `marketplace` category to CATEGORIES.md and commits the plugin marketplace architecture research doc that informed the skill design. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
80 lines
4.5 KiB
Markdown
80 lines
4.5 KiB
Markdown
# Cross-Tool Compatibility Reference
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Claude Code and GitHub Copilot CLI share the plugin concept but diverge in specific, breaking
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ways. **Skills are the portable core. Manifests and agents are where they split.**
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Make Claude Code the source of truth — it is the stricter, more fully specified format.
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Treat "loads in Copilot CLI" as a tested checklist item per plugin, not an assumption.
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---
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## Divergence table
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| Concern | Claude Code | GitHub Copilot CLI | Portable choice |
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|---|---|---|---|
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| Marketplace manifest path | `.claude-plugin/marketplace.json` (required) | `.github/plugin/marketplace.json` (primary); also reads `.claude-plugin/` | Put it in `.claude-plugin/` — both read it. Optionally mirror to `.github/plugin/`. |
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| Plugin manifest path | `.claude-plugin/plugin.json` (required; only `plugin.json` goes in this dir) | `plugin.json` at **plugin root** | Ship in both locations until verified — see ⚠️ below |
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| Skills | `skills/<name>/SKILL.md` | `skills/<name>/SKILL.md` | ✅ Identical |
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| Agents | `agents/<name>.md` | `agents/<name>.agent.md` (frontmatter incl. `tools:`) | Diverges — keep portable logic in skills; ship per-tool agent files only when needed |
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| Hooks | `hooks/hooks.json` | `hooks.json` at plugin root | Diverges; declare paths in manifest to be safe |
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| MCP servers | `.mcp.json` at plugin root | `.mcp.json` at plugin root | ✅ Same |
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| Relative `source` | must start with `./` | `./x` and `x` both valid | Always use `./` — valid for both |
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| Validate command | `claude plugin validate .` (or `/plugin validate .`) | none documented | Run Claude validator + manual JSON checks for Copilot |
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| Install marketplace | `claude plugin marketplace add owner/repo` | `copilot plugin marketplace add owner/repo` | Same shape |
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| Install plugin | `claude plugin install <name>@<marketplace-name>` | install by plugin name; `@marketplace` suffix unconfirmed | ⚠️ Verify Copilot install string before documenting |
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| Local install (dev) | `claude --plugin-dir ./plugin` | `copilot plugin install ./plugin` | Tool-specific |
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| Component paths in plugin.json | Claude defaults to standard dirs; path overrides via marketplace entry only | `"skills": "skills/"`, `"agents": "agents/"`, etc. in plugin.json | Generate per-tool manifests rather than one shared file |
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> ⚠️ **UNVERIFIED — test before committing to a layout.**
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> Copilot docs confirm it reads the **marketplace** manifest from `.claude-plugin/`. They do NOT
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> confirm the same fallback for a plugin's `plugin.json`. Copilot docs show `plugin.json` at plugin
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> root; Claude requires it in `.claude-plugin/`. Until verified: ship `plugin.json` in BOTH
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> `plugin-name/plugin.json` and `plugin-name/.claude-plugin/plugin.json` (identical content), then
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> drop whichever proves redundant.
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---
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## `@<marketplace-name>` resolution
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`claude plugin install startup-cto@my-ai-marketplace` requires the marketplace manifest's
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top-level `name` field to be exactly `my-ai-marketplace`. It is **not** the GitHub repo name.
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Keep them aligned to avoid confusion, but they are separate fields.
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---
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## Canonical cross-compatible repo layout
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```text
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repo-root/
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├── .claude-plugin/
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│ └── marketplace.json # both tools read here
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├── .github/plugin/
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│ └── marketplace.json # OPTIONAL: Copilot canonical path (mirror)
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├── plugins/
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│ └── startup-cto/
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│ ├── plugin.json # Copilot root manifest ┐ ship both until
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│ ├── .claude-plugin/ # │ the note above is
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│ │ └── plugin.json # Claude manifest ┘ verified
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│ ├── skills/
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│ │ ├── fundraising/SKILL.md
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│ │ └── hiring/SKILL.md
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│ ├── agents/
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│ │ ├── startup-cto.md # Claude
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│ │ └── startup-cto.agent.md # Copilot (only if shipping native agents)
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│ ├── hooks/hooks.json # Claude
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│ ├── hooks.json # Copilot (if hooks used)
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│ └── README.md
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└── README.md
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```
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---
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## Open questions to resolve before generating layouts
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1. **Does Copilot CLI load a plugin whose `plugin.json` lives only in `.claude-plugin/`?**
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Install a test plugin both ways. The answer decides whether to ship one manifest or two.
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2. **What is Copilot's exact install-from-marketplace command?**
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Run `copilot plugin install --help`. The `update`/`uninstall` commands take a bare plugin
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name — the `@marketplace` form may not apply.
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