skill-terraformer

name	skill-terraformer
description	This skill should be used at session start to auto-detect the project stack and install missing skills.sh skills, or when the user asks to "install skills", "detect stack skills", or "set up project skills". Detects react, next, shadcn, expo, and other stacks.

Skill Terraformer

Detect the project's tech stack, compare against a curated skills manifest, install missing skills from skills.sh, and ensure postinstall persistence.

Step 1: Detect Project Stack

Read the project's package.json (root) and check for these signals:

Signal	How to detect	Tag
React	react in dependencies or devDependencies	react
Next.js	next in dependencies or devDependencies	next
shadcn/ui	react in deps AND components.json exists in project root	shadcn
Vue	vue in dependencies or devDependencies	vue
Svelte	svelte in dependencies or devDependencies	svelte
Nx	nx.json exists in project root	nx
Expo	expo in dependencies or devDependencies	expo
Vite	vite in dependencies or devDependencies	vite
Solid.js	solid-js in dependencies or devDependencies	solid-js
Angular	@angular/core in dependencies or devDependencies	angular

Frontend universal: If ANY of react, next, vue, svelte, solid-js, angular is detected, the project is a frontend project (tag: frontend).

Collect all matching tags into a set.

Step 2: Curated Skills Manifest

Map detected tags to applicable skills:

Condition	Repo	Skill	Install command
react	vercel-labs/agent-skills	vercel-react-best-practices	bunx skills add vercel-labs/agent-skills --skill vercel-react-best-practices --agent claude-code -y
react	vercel-labs/agent-skills	vercel-composition-patterns	bunx skills add vercel-labs/agent-skills --skill vercel-composition-patterns --agent claude-code -y
shadcn	shadcn/ui	shadcn	bunx skills add shadcn/ui --skill shadcn --agent claude-code -y
next	vercel-labs/next-skills	next-best-practices	bunx skills add vercel-labs/next-skills --skill next-best-practices --agent claude-code -y
frontend	vercel-labs/agent-skills	web-design-guidelines	bunx skills add vercel-labs/agent-skills --skill web-design-guidelines --agent claude-code -y
frontend	anthropics/skills	frontend-design	bunx skills add anthropics/skills --skill frontend-design --agent claude-code -y

When multiple skills come from the same repo, batch them:

bunx skills add vercel-labs/agent-skills --skill vercel-react-best-practices --skill vercel-composition-patterns --skill web-design-guidelines --agent claude-code -y

Evaluate all conditions against the detected tags. Collect the set of applicable skills.

If no conditions match, report "No applicable skills detected for this project's stack" and stop.

Step 3: Query Installed Skills

Run:

bunx skills list --json

Parse the JSON output to get the list of already-installed skill names.

If skills are installed but skills-lock.json does not exist: Warn: "Skills are installed but skills-lock.json is missing. Run bunx skills update to generate it, then commit the file."

If the command fails or returns invalid JSON:

• Report: "Could not query installed skills — bunx skills list --json failed."
• Mark detection state as unknown.
• Do NOT assume all applicable skills are pending.
• Ask the user for confirmation before attempting any installations.

Step 4: Diff — Find Pending Skills

Compare: applicable skills minus already-installed skills = pending skills.

• If no pending skills: report "All applicable skills already installed." and skip to Step 6.
• If pending skills exist: list them and proceed to installation.

Step 5: Install Pending Skills

For each pending skill (or batched by repo):

bunx skills add <repo> --skill <name> --agent claude-code -y

Error handling: If an installation command fails:

• Report the failure (skill name + error).
• Continue with remaining skills.
• Do not abort the entire flow.

Track how many skills were installed successfully vs. failed.

Step 6: Postinstall Management

Only proceed if skills are managed (at least one skill.sh skill is installed, either from this session or previously).

6a. Check existing postinstall

Read the root package.json and check scripts.postinstall.

6b. Apply postinstall logic

The postinstall command to ensure is:

[ -f skills-lock.json ] && bunx skills experimental_install || true

No postinstall script exists: Propose adding "postinstall": "[ -f skills-lock.json ] && bunx skills experimental_install || true".

postinstall exists but does NOT contain skills experimental_install: Propose appending && ( [ -f skills-lock.json ] && bunx skills experimental_install || true ) to existing script. Parentheses isolate the fallback so || true doesn't mask failures from the original postinstall.

postinstall already contains skills experimental_install: No changes needed.

6c. Lock file advisory

If skills-lock.json was created or updated during this session, advise:

skills-lock.json should be committed to version control. Without it, bunx skills experimental_install cannot restore skills on fresh clones.