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 skills add mike-coulbourn/claude-vibes --skill skill-buildergit clone --depth 1 https://github.com/mike-coulbourn/claude-vibesWrote 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/skills/mike-coulbourn/claude-vibes/skill-builder)<a href="https://agentmods.dev/skills/mike-coulbourn/claude-vibes/skill-builder"><img src="https://agentmods.dev/badge/skills/mike-coulbourn/claude-vibes/skill-builder/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/mike-coulbourn/claude-vibes/skill-builder"><img src="https://agentmods.dev/badge/skills/mike-coulbourn/claude-vibes/skill-builder.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.00051 | $0.02071 |
| Opus 5 | $0.00026 | $0.01035 |
| Sonnet 5 | $0.00010 | $0.00414 |
| Haiku 4.5 | $0.00005 | $0.00207 |
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 9d 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 — 323 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill Builder
Build production-quality Skills for Claude Code with proper structure, discoverable descriptions, and best practices.
Quick Reference
Description Formula: [What it does] + [When to use it] + [Trigger terms users say]
Name Rules: Lowercase letters, numbers, hyphens only; max 64 characters; no spaces
Description Rules: Max 1024 characters; must be specific with trigger terms
The Skill Creation Workflow
Phase 1: Requirements Gathering
Use AskUserQuestion to understand what they need:
-
What should the Skill do?
- What capability or expertise should it provide?
- What tasks should it help with?
-
When should it activate?
- What scenarios or contexts?
- What words/phrases would users say?
- What file types or operations?
-
Scope decision
- Personal Skill (~/.claude/skills/) - just for this user
- Project Skill (.claude/skills/) - shared with team via git
-
Structure complexity
- Single file (simple instructions/examples)
- Multi-file (scripts, templates, extensive docs)
-
Tool restrictions
- Full access (default)
- Restricted (allowed-tools field for read-only or limited scope)
Phase 2: Description Crafting
The description determines discoverability. Use this proven formula:
[Specific operations] + [When to use] + [Trigger terms]
Example walkthrough:
- ❌ "Helps with documents" (too vague)
- ✅ "Extract text and tables from PDF files, fill forms, merge documents. Use when working with PDF files or when user mentions PDFs, forms, or document extraction."
Key elements:
- Specific operations: List concrete actions (extract, analyze, generate, validate)
- When to use: Scenarios and contexts (when working with X, during Y, for Z tasks)
- Trigger terms: Exact words users would say (PDF, forms, commit message, data analysis)
See examples/descriptions.md for more patterns.
Phase 3: Name Validation
What ships with it
4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 9d ago First seen · 323 lines · 51 tokens per session scan A 9131f803363a
skill-builder is a skill published in the GitHub repository mike-coulbourn/claude-vibes (39 stars, last pushed 8mo ago), licensed MIT. It adds 51 tokens to every session and 2,071 once invoked, about $0.0003 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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