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 LiozShor/claude-code-skills --skill skills-buildgit clone --depth 1 https://github.com/LiozShor/claude-code-skillsWrote 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/liozshor/claude-code-skills/skills-build)<a href="https://agentmods.dev/skills/liozshor/claude-code-skills/skills-build"><img src="https://agentmods.dev/badge/skills/liozshor/claude-code-skills/skills-build/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/liozshor/claude-code-skills/skills-build"><img src="https://agentmods.dev/badge/skills/liozshor/claude-code-skills/skills-build.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 | $0.00068 | $0.02459 |
| Opus 5 | $0.00034 | $0.01229 |
| Sonnet 5 | $0.00014 | $0.00492 |
| Haiku 4.5 | $0.00007 | $0.00246 |
Grade A, and why
skills-build 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 10d 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 — 164 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skills Build
Create focused, reliable, measurable agent skills from real workflows. A skill is a reusable procedural capability — it teaches the agent when to act, how to act, what decisions to make, what tools/references to use, what output to produce, and what mistakes to avoid. The goal is not impressive documentation; it is a skill that improves agent performance on repeated work.
When this triggers
Building NEW skills only. For audits or improvements of existing skills, use skill-improver.
Use this skill when the user asks to:
- Create a new skill.
- Convert a recurring workflow into a skill.
- Scaffold a
SKILL.mdfile. - Decide whether something should be a skill.
- Build a skill for Claude Code, Codex, Gemini, OpenCode, Copilot, or any environment supporting skill folders.
When this does not trigger
- Reviewing, auditing, or improving an existing skill → use
skill-improver. - One-off requests, or work that a
CLAUDE.md/AGENTS.mdline already covers. - General prompting advice, or generic knowledge the model already has.
- Inventing a skill with no real workflow evidence and no concrete use case.
If the user asks for a skill but the workflow is too vague, create a minimal draft, mark assumptions explicitly, and do not pretend it is production-ready.
Skill decision filter
Create a skill when most of these are true:
- The same multi-step process repeats across sessions.
- The workflow has decision points, gates, or conditional logic.
- The task requires specific deliverables in specific formats.
- The process uses reference material too large for always-on context.
- Other agents or team members should run the same process consistently.
- The workflow benefits from scripts, templates, or reusable assets.
- The user has examples of past failures or edge cases.
Do not create a skill when a CLAUDE.md/AGENTS.md rule covers it, when it is one-off, when there is no clear trigger, or when the only reason is that "a skill sounds nice."
What ships with it
6 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.
- 10d ago First seen · 164 lines · 68 tokens per session scan A 331a2680ed7b
skills-build is a skill published in the GitHub repository LiozShor/claude-code-skills (2 stars, last pushed 22d ago), licensed MIT. It adds 68 tokens to every session and 2,459 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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