docs: tell one true install story (official marketplace)

mattpocock-skills is now listed in Claude Code's official marketplace,
so the own-marketplace route is superseded. The queued changeset still
documented it, and changeset bodies ship verbatim into CHANGELOG.md —
the release would have published a superseded install route as its
headline.

- Rewrite .changeset/ship-as-claude-plugin.md around
  `claude plugins install mattpocock-skills`.
- Add .agents/install-block.md as the single source for install
  wording, so the docs pass has one true thing to copy.
- Point .agents/writing-docs.md and CLAUDE.md at it.
- Note the official listing in ADR 0002, and record that it reads
  plugin.json directly and does not depend on marketplace.json.

.claude-plugin/marketplace.json is kept as a fallback for direct-repo
installs; nothing in CI or scripts references it.

Refs mattpocock/personal-wiki#250

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
This commit is contained in:
Matt Pocock
2026-08-05 09:57:57 +01:00
co-authored by Claude Opus 5
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# The canonical install block
One install story, one wording. `README.md`, `.changeset/*`, and every page under `docs/` say **this** and nothing else. If the install route changes, change it here first, then propagate.
`mattpocock-skills` is listed in **Claude Code's official marketplace** (`claude-plugins-official`), which every Claude Code install has configured out of the box. There is no marketplace to add first, and official-marketplace plugins auto-update in the background.
## Claude Code (the plugin)
<canonical-block>
```bash
claude plugins install mattpocock-skills
```
Or, from inside a session:
```
/plugin install mattpocock-skills
```
It's in Claude Code's official marketplace, so there's nothing to add first, and updates arrive automatically.
</canonical-block>
## Codex, and other agents (skills.sh)
The plugin is Claude Code only. Everywhere else, [skills.sh](https://skills.sh/mattpocock/skills) copies editable skill files into the project:
```bash
npx skills@latest add mattpocock/skills
```
For a single skill, `npx skills add mattpocock/skills --skill=<name>`; to refresh it later, `npx skills update <name>`.
## The two routes are exclusive
The plugin is a managed, read-only bundle you subscribe to. skills.sh writes files you own and edit. Installing both leaves the user with every skill twice — always say "pick one".
## Not the install story
`.claude-plugin/marketplace.json` makes the repo its own single-plugin marketplace (`/plugin marketplace add mattpocock/skills`, then `/plugin install mattpocock-skills@mattpocock`). The official listing supersedes it. It is kept as a fallback for installing the repo directly — an unreleased commit, or a fork — and is **not** documented to users.