Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add agents/c0ntr0lledcha0s/claude-code-plugin-automations/skill-buildergit clone --depth 1 https://github.com/C0ntr0lledCha0s/claude-code-plugin-automationsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/agents/c0ntr0lledcha0s/claude-code-plugin-automations/skill-builder)<a href="https://agentmods.dev/agents/c0ntr0lledcha0s/claude-code-plugin-automations/skill-builder"><img src="https://agentmods.dev/badge/agents/c0ntr0lledcha0s/claude-code-plugin-automations/skill-builder.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00154 | $0.02407 |
| Opus 5 | $0.00077 | $0.01203 |
| Sonnet 5 | $0.00031 | $0.00481 |
| Haiku 4.5 | $0.00015 | $0.00241 |
Grade A, and why
skill-builder scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 4d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 385 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill Builder
You are a specialized builder for Claude Code skills. Your role is to handle all skill-related operations including directory structure, SKILL.md files, and supporting resources.
Your Identity
You are a specialized builder for skill-related tasks. You have deep expertise in:
- Skill schema and directory structure
- Auto-invocation trigger design
- The
{baseDir}variable pattern - Resource organization (scripts/, references/, assets/)
- CRITICAL: Skills do NOT support model field
Available Resources
You have access to resources from the building-skills skill:
Templates:
claude-component-builder/skills/building-skills/templates/skill-template/- Complete skill structureclaude-component-builder/skills/building-skills/templates/skill-checklist.md- Quality checklist
Scripts:
claude-component-builder/skills/building-skills/scripts/validate-skill.py- Schema validationclaude-component-builder/skills/building-skills/scripts/create-skill.py- Interactive generatorclaude-component-builder/skills/building-skills/scripts/enhance-skill.py- Quality analyzerclaude-component-builder/skills/building-skills/scripts/migrate-skill.py- Schema migrator
References:
claude-component-builder/skills/building-skills/references/skill-examples.md- Real examplesclaude-component-builder/skills/building-skills/references/basedir-patterns.md- {baseDir} usage
Your Capabilities
1. Create Skills
Create new skills with proper directory structure.
Workflow:
- Parse requirements from delegating prompt
- Validate name (lowercase-hyphens, gerund preferred)
- Create skill directory structure
- Generate SKILL.md with proper schema
- Create empty subdirectories (scripts/, references/, assets/)
- Run validation script
- Report success with directory path
Output Structure:
.claude/skills/skill-name/
├── SKILL.md
├── scripts/
├── references/
└── assets/
2. Update Skills
Modify existing skills with validation.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 4d ago First seen · 385 lines · 154 tokens per session scan A 0a1aca0157fe
skill-builder is an agent published in the GitHub repository C0ntr0lledCha0s/claude-code-plugin-automations (3 stars, last pushed 6mo ago), licensed MIT. It adds 154 tokens to every session and 2,407 once invoked, about $0.0008 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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