utun2/.opencode/context/openagents-repo/guides/adding-skill-implementation.md

Guide: OpenCode Skill Implementation

Prerequisites: Load adding-skill-basics.md first
Purpose: CLI implementation, registry, and testing for OpenCode skills

---

CLI Implementation

Basic Structure

#!/usr/bin/env ts-node
// CLI implementation for {skill-name} skill

interface Args {
  command: string
  [key: string]: any
}

async function main() {
  const args = parseArgs()
  
  switch (args.command) {
    case 'command1':
      await handleCommand1(args)
      break
    case 'command2':
      await handleCommand2(args)
      break
    case 'help':
    default:
      showHelp()
  }
}

function parseArgs(): Args {
  const args = process.argv.slice(2)
  return {
    command: args[0] || 'help',
    ...parseOptions(args.slice(1))
  }
}

async function handleCommand1(args: Args) {
  console.log('Running command1...')
}

function showHelp() {
  console.log(`
{Skill Name}

Usage: npx ts-node scripts/skill-cli.ts <command> [options]

Commands:
  command1    Description
  command2    Description
  help        Show this help
`)
}

main().catch(console.error)

---

Register in Registry (Optional)

Add to Components

{
  "skills": [
    {
      "id": "{skill-name}",
      "name": "Skill Name",
      "type": "skill",
      "path": ".opencode/skills/{skill-name}/SKILL.md",
      "description": "Brief description",
      "tags": ["tag1", "tag2"],
      "dependencies": []
    }
  ]
}

Add to Profiles

{
  "profiles": {
    "essential": {
      "components": [
        "skill:{skill-name}"
      ]
    }
  }
}

---

Testing

Test CLI Commands

# Test help
bash .opencode/skills/{skill-name}/router.sh help

# Test commands
bash .opencode/skills/{skill-name}/router.sh command1 --option value

# Test with npx
npx ts-node .opencode/skills/{skill-name}/scripts/skill-cli.ts help

Test OpenCode Integration

1. Call skill via OpenCode
2. Verify event hooks fire correctly
3. Check conversation history for skill content
4. Verify output enhancement works

---

Best Practices

Keep Skills Focused

• ✅ Task management skill → Tracks tasks
• ❌ Task management + code generation + testing → Too broad

Clear Documentation

• Provide usage examples
• Document all commands
• Include expected outputs

Error Handling

• Handle missing arguments gracefully
• Provide helpful error messages
• Validate inputs before processing

Performance

• Use efficient algorithms
• Cache when appropriate
• Avoid unnecessary file operations

---

Checklist

• .opencode/skills/{skill-name}/SKILL.md created
• .opencode/skills/{skill-name}/router.sh created (if CLI-based)
• Router script is executable (chmod +x)
• Registry updated (if needed)
• Profile updated (if needed)
• All commands tested
• Documentation complete

---

Related

• adding-skill-basics.md - Directory and SKILL.md setup
• adding-skill-example.md - Complete example
• creating-skills.md - Claude Code Skills
• plugins/context/capabilities/events_skills.md - Skills Plugin