[potiuk]

Publish every skill in tools/skills/ as a plugin that installs and updates from the Claude Code, Codex and GitHub Copilot marketplaces.

What changes

• Each skill becomes a plugin directory: tools/skills/<skill>/.claude-plugin/plugin.json, with the skill in tools/skills/<skill>/skills/<skill>/SKILL.md and its scripts/, templates/ and references/ beside it.
  The single-file skills move there from <skill>.md and the shared scripts/, templates/ and references/ directories; releasecheck and maturity-model-assessment move down one level.
  The skills already refer to their files relative to the skill (scripts/rules.json, templates/announce-email.md, …), and the scripts find theirs relative to themselves, so no skill text changes.
• All eleven are listed in the marketplace catalogs: .claude-plugin/marketplace.json (Claude Code), .agents/plugins/marketplace.json (Codex, which already listed releasecheck) and a new root marketplace.json (VS Code / GitHub Copilot).
• The releasecheck Makefile and README follow the move, and package-skills.py packages the nested skill when given a plugin directory; the .skill packages it builds are unchanged.
• The README documents the layout, the per-agent install commands, and how to release a skill: bump version in its plugin.json and tag <skill>-<version>, as releasecheck-0.5.1 was.
• A separate commit defines the eleven topics tutor lessons 19–21 use, which were failing the Training links check on master.

Why the skills/<skill>/ level

Codex installs a plugin whose SKILL.md sits at the plugin root but never lists the skill: it looks only in skills/<name>/. That includes releasecheck as it is on master today. Claude Code finds the skill either way.

Tested

• claude plugin validate passes for the marketplace and all eleven plugins.
• Installed all eleven into clean Claude Code and Codex homes: each one exposes its skill in both (Codex checked with codex debug prompt-input).
• python3 package-skills.py --all builds all eleven; make test in releasecheck passes (44/44 planted problems found).
• Not tested: an install from the Copilot catalog.

After merging

Tag the skills you consider ready (<skill>-0.1.0). Apache Magpie curates this repository as a skill source for ASF projects, pinned per skill, and its weekly drift check picks new tags up.
Links to the old paths (e.g. tools/skills/graduation-self-assessment.md) will 404; the new path is tools/skills/graduation-self-assessment/skills/graduation-self-assessment/SKILL.md.
In Claude Code, releasecheck's skill now shows as releasecheck rather than podling-release-check; Codex still uses the frontmatter name.

🤖 Generated with Claude Code

[potiuk]

cc: @justinmclean -> WDYT ?