agent: Add create-package skill

Author: grypez

.claude/settings.json

@@ -1,6 +1,6 @@
 {
   "permissions": {
-    "allow": ["Skill(code-review)", "Skill(glossary)"],
+    "allow": ["Skill(code-review)", "Skill(create-package)", "Skill(glossary)"],
     "deny": ["Read(**/.env)", "Read(**/.env.*)"]
   }
 }

.claude/skills/create-package/SKILL.md

@@ -0,0 +1,64 @@
+---
+name: create-package
+description: Create a new monorepo package using the create-package CLI
+---
+
+# Create Package Skill
+
+Use this skill when the user asks to create a new package in the monorepo.
+
+## Overview
+
+The `yarn create-package` command automates the creation of new monorepo packages by:
+
+- Generating package scaffolding from the template package
+- Setting up the package structure, configuration files, and dependencies
+- Creating package.json with the provided name and description
+
+## Required Arguments
+
+- `--name` (or `-n`): The package name. Will be prefixed with "@ocap/" if not provided.
+- `--description` (or `-d`): A short description of the package for package.json
+
+## Usage Pattern
+
+1. Ask the user for the package name and description if not provided
+2. Run `yarn create-package --name <package-name> --description "<description>"`
+3. After successful creation, remind the user to:
+   - Add coverage thresholds to the root `vitest.config.ts` file
+   - Add any additional dependencies using `yarn workspace @ocap/<package-name> add <dep>`
+   - If adding monorepo packages as dependencies, update the `references` array in the package's `tsconfig.json` and `tsconfig.build.json`
+
+## Example
+
+```bash
+yarn create-package --name my-package --description "A package for handling my feature"
+```
+
+This creates a new package at `packages/my-package` with the name `@ocap/my-package`.
+
+## Post-Creation Steps
+
+Always remind the user of these manual steps after package creation:
+
+1. **Add coverage thresholds** to root `vitest.config.ts`:
+
+   - The CLI cannot modify .ts config files automatically
+   - Add appropriate coverage thresholds for the new package
+
+2. **Add dependencies** if needed:
+
+   ```bash
+   yarn workspace @ocap/<package-name> add <dependency>
+   ```
+
+3. **Update TypeScript references** if adding monorepo dependencies:
+   - Add to `references` array in `tsconfig.json`
+   - Add to `references` array in `tsconfig.build.json`
+
+## Notes
+
+- The package name will automatically be prefixed with "@ocap/" if not provided
+- The created package is private by default
+- The template is located at `packages/template-package/`
+- All placeholder values in the template will be replaced with actual values