Opencode Skills Maintainer

What I do

I maintain the Build-With-Skills and Plan-With-Skills agents by:

1. Discover All Skills: Scan the skills/ folder to discover all available skills
2. Extract Skill Metadata: Read frontmatter from each SKILL.md file (name, description, category)
3. Categorize Skills: Organize skills into logical categories (Framework, Test Generators, Linters, etc.)
4. Update Agent Prompts: Update both Build-With-Skills and Plan-With-Skills system prompts with the complete, current skill list
5. Validate Changes: Ensure config.json is valid after updates
6. Generate Report: Provide a summary of changes made

When to use me

Use this skill when:

• You've added new skills to the skills/ folder
• You've removed skills from the skills/ folder
• You've updated skill descriptions or metadata
• You want to ensure agents have the latest skill list
• Agents are unable to find skills that should be available

Prerequisites

• Access to the repository root directory
• jq tool installed for JSON validation
• Python 3+ installed for JSON manipulation
• Write permissions for config.json

Steps

Step 1: Discover All Skills

Scan the skills/ folder to find all skill directories:

# Find all skill directories
find skills/ -name "SKILL.md" -type f | sort

Step 2: Extract Skill Metadata

For each skill, read the frontmatter to extract:

# Extract name and description from frontmatter
for skill_dir in skills/*/; do
  echo "=== $(basename "$skill_dir") ==="
  head -10 "$skill_dir/SKILL.md" | grep -E "(name:|description:)" | head -2
  echo
done

Required Fields:

• name: The skill identifier (used in agent prompts)
• description: Brief description of what the skill does
• Optional: category, workflow, audience (from metadata section)

Step 3: Categorize Skills

Organize skills into logical categories:

# Framework Skills (Foundational Workflows)
- linting-workflow
- test-generator-framework
- ticket-branch-workflow
- pr-creation-workflow

# Language-Specific Test Generators
- python-pytest-creator
- nextjs-unit-test-creator

# Language-Specific Linters
- python-ruff-linter
- javascript-eslint-linter

# Project Setup
- nextjs-standard-setup

# Git/Workflow
- git-issue-creator
- git-pr-creator
- jira-git-integration
- jira-git-workflow
- nextjs-pr-workflow

# OpenCode Meta
- opencode-agent-creation
- opencode-skill-creation
- opencode-skill-auditor

# OpenTofu/Infrastructure
- opentofu-provider-setup
- opentofu-provisioning-workflow
- opentofu-aws-explorer
- opentofu-kubernetes-explorer
- opentofu-neon-explorer
- opentofu-keycloak-explorer

# Code Quality/Documentation
- docstring-generator
- typescript-dry-principle
- coverage-readme-workflow

# Utilities
- ascii-diagram-creator

Step 4: Update Build-With-Skills Agent Prompt

Generate the "Available Skills" section for Build-With-Skills:

# Python script to update Build-With-Skills prompt
import json

# Build the skills section
skills_section = """## Available Skills (Hardcoded in System Prompt)

### Framework Skills (Foundational Workflows)
- **linting-workflow**: {description}
- **test-generator-framework**: {description}
- **ticket-branch-workflow**: {description}
- **pr-creation-workflow**: {description}

### Language-Specific Test Generators
- **python-pytest-creator**: {description}
- **nextjs-unit-test-creator**: {description}

# ... (continue for all categories)

"""

Update Process:

1. Read current config.json
2. Replace the skill discovery section with hardcoded skill list
3. Remove references to SKILL_INDEX.json
4. Update skill execution paths from [skill-path] to [skill-name]
5. Preserve all other prompt content (workflow, guidelines, QA)
6. Write back to config.json

Step 5: Update Plan-With-Skills Agent Prompt

Generate the same "Available Skills" section for Plan-With-Skills:

The skills section should be identical between both agents to ensure consistency.

Update Process:

1. Read current config.json
2. Replace the skill discovery section with hardcoded skill list
3. Remove references to SKILL_INDEX.json
4. Update skill selection guidelines to match hardcoded list
5. Preserve all other prompt content (workflow, guidelines, QA)
6. Write back to config.json

Step 6: Validate Changes

Validate the updated config.json:

# Validate JSON syntax
jq . config.json

# Check if JSON is valid
echo "Exit code: $?"
# Exit code 0 = valid JSON

Step 7: Generate Report

Create a summary of changes:

# Skills Maintenance Report

## Skills Found: {total_count}

### Categories
- Framework Skills: {count}
- Language-Specific Test Generators: {count}
- Language-Specific Linters: {count}
- Project Setup: {count}
- Git/Workflow: {count}
- OpenCode Meta: {count}
- OpenTofu/Infrastructure: {count}
- Code Quality/Documentation: {count}
- Utilities: {count}

## Changes Made
- Updated Build-With-Skills agent prompt with {count} skills
- Updated Plan-With-Skills agent prompt with {count} skills
- Removed SKILL_INDEX.json references
- Updated skill discovery workflow to use hardcoded list

## New Skills Added (if any)
- [skill-name]: description

## Removed Skills (if any)
- [skill-name]: previously in list

## Validation
✓ JSON validation passed
✓ Both agents updated successfully
✓ Skill lists synchronized

Best Practices

Categorization Logic

Framework Skills: Skills that provide foundational workflows used by other skills

• Test framework, linting framework, PR workflow, ticket workflow

Language-Specific: Skills for specific programming languages or frameworks

• Test generators, linters, project setup

Meta Skills: Skills that create/audit other skills or agents

• opencode-agent-creation, opencode-skill-creation, opencode-skill-auditor

Domain-Specific: Skills for specific domains

• OpenTofu infrastructure, Git/DevOps, documentation

Prompt Structure

Both agent prompts should follow this structure:

1. Available Skills (hardcoded, categorized)
2. Core Workflow (updated to remove SKILL_INDEX.json)
3. Skill Selection Guidelines (match hardcoded list)
4. Skill Execution Process (path updated to [skill-name])
5. Error Handling (no fallback to SKILL_INDEX.json)
6. Quality Assurance (unchanged)
7. Output Format (no first step to read SKILL_INDEX.json)

Consistency

• Both agents should have identical skill lists and categories
• Skill names and descriptions should match SKILL.md exactly
• Maintain alphabetical ordering within categories
• Use consistent formatting (bold names, descriptions after colon)

Common Issues

SKILL.md Not Found

Issue: Cannot find SKILL.md in a skill directory

Solution:

# Verify SKILL.md exists for all skills
for dir in skills/*/; do
  if [ ! -f "$dir/SKILL.md" ]; then
    echo "Missing SKILL.md in: $dir"
  fi
done

Invalid Frontmatter

Issue: SKILL.md has missing or malformed frontmatter

Solution:

# Check for required frontmatter fields
for dir in skills/*/; do
  if ! grep -q "^name:" "$dir/SKILL.md"; then
    echo "Missing 'name:' field in: $dir/SKILL.md"
  fi
  if ! grep -q "^description:" "$dir/SKILL.md"; then
    echo "Missing 'description:' field in: $dir/SKILL.md"
  fi
done

JSON Validation Fails

Issue: jq . config.json returns errors

Solution:

• Check for unclosed brackets or quotes
• Ensure strings are properly escaped
• Verify no trailing commas in JSON arrays
• Use Python JSON validation as backup:

  python3 -m json.tool config.json > /dev/null
  

Agent Prompts Not Updated

Issue: config.json changes don't reflect in agent prompts

Solution:

• Verify config.json was saved correctly
• Check that Python script wrote the file successfully
• Re-run this skill to regenerate prompts
• Manually verify prompt sections with jq

Verification Commands

After running this skill, verify with these commands:

# Verify JSON syntax
jq . config.json && echo "✓ JSON valid"

# Check Build-With-Skills has skill list
jq '.agent["build-with-skills"].prompt' config.json | grep "Available Skills" && echo "✓ Build-With-Skills updated"

# Check Plan-With-Skills has skill list
jq '.agent["plan-with-skills"].prompt' config.json | grep "Available Skills" && echo "✓ Plan-With-Skills updated"

# Verify no SKILL_INDEX.json references
! jq '.agent["build-with-skills"].prompt' config.json | grep -q "SKILL_INDEX.json" && echo "✓ SKILL_INDEX.json references removed"

# Verify both agents have identical skill sections
BWS_SKILLS=$(jq '.agent["build-with-skills"].prompt' config.json | sed -n '/## Available Skills/,/## Core Workflow/p')
PWS_SKILLS=$(jq '.agent["plan-with-skills"].prompt' config.json | sed -n '/## Available Skills/,/## Core Workflow/p')
[ "$BWS_SKILLS" = "$PWS_SKILLS" ] && echo "✓ Skill lists synchronized"

Verification Checklist:

• JSON validation passes
• Build-With-Skills has "Available Skills" section
• Plan-With-Skills has "Available Skills" section
• Both skill lists are identical
• No SKILL_INDEX.json references remain
• Skill names match SKILL.md files
• All skills are categorized correctly
• Descriptions match SKILL.md frontmatter

Automation

This skill can be automated with a cron job or git hook:

Git Pre-Commit Hook:

#!/bin/bash
# .git/hooks/pre-commit

# Check if skills changed
if git diff --name-only --cached | grep -q "^skills/"; then
  echo "Skills changed, updating agent prompts..."
  opencode --agent build-with-skills "Use opencode-skills-maintainer to update agent prompts"
fi

Cron Job (run daily):

# Run at 2 AM daily
0 2 * * * cd /path/to/repo && opencode --agent build-with-skills "Use opencode-skills-maintainer to update agent prompts"

Example Output

Skills Found: 27

Categories

• Framework Skills: 4
• Language-Specific Test Generators: 2
• Language-Specific Linters: 2
• Project Setup: 1
• Git/Workflow: 5
• OpenCode Meta: 3
• OpenTofu/Infrastructure: 6
• Code Quality/Documentation: 3
• Utilities: 1

Changes Made

• Updated Build-With-Skills agent prompt with 27 skills
• Updated Plan-With-Skills agent prompt with 27 skills
• Removed SKILL_INDEX.json references
• Updated skill discovery workflow to use hardcoded list

New Skills Added

• nextjs-standard-setup: Create standardized Next.js 16 demo applications with shadcn, Tailwind v4, and specific folder structure using Tekk-prefixed components

Validation

✓ JSON validation passed ✓ Both agents updated successfully ✓ Skill lists synchronized

Related Skills

• opencode-agent-creation: For creating new agents
• opencode-skill-creation: For creating new skills
• opencode-skill-auditor: For auditing skill redundancy