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 BuilderCed/agent-skills --skill skill-quality-lintergit clone --depth 1 https://github.com/BuilderCed/agent-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/builderced/agent-skills/skill-quality-linter)<a href="https://agentmods.dev/skills/builderced/agent-skills/skill-quality-linter"><img src="https://agentmods.dev/badge/skills/builderced/agent-skills/skill-quality-linter.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 5.1 | $0.00030 | $0.00970 |
| Opus 5 | $0.00015 | $0.00485 |
| Sonnet 5 | $0.00006 | $0.00194 |
| Haiku 4.5 | $0.00003 | $0.00097 |
Grade A, and why
skill-quality-linter 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 7d 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 — 120 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill Quality Linter
When to Use
- Before publishing a new skill to a registry
- Reviewing a skill PR
- Auditing existing skill quality
- Setting up CI for a skill repository
Lint Checks
1. Frontmatter (Required Fields)
| Field | Required | Format |
|---|---|---|
| name | YES | kebab-case, matches directory name |
| description | YES | 1 line, max 250 chars, starts with verb |
| version | YES | Semver (X.Y.Z) |
| last-updated | YES | YYYY-MM-DD, not in future |
| platforms | YES | Array of known platform names |
| license | YES | Valid SPDX identifier |
| dependencies | RECOMMENDED | Object with mcp, skills, apis, data |
| update_sources | RECOMMENDED | Array with url + check_frequency |
| language | RECOMMENDED | ISO 639-1 (en, fr, etc.) |
| geo_relevance | RECOMMENDED | Array (global, fr, eu, africa, etc.) |
| category | RECOMMENDED | Matches parent directory name |
| priority | OPTIONAL | critical, high, medium, low |
2. Structure
| Check | Rule |
|---|---|
Starts with --- |
Valid YAML frontmatter |
Has # Title |
H1 heading after frontmatter |
Has ## When to Use |
Trigger conditions documented |
Has ## What This Skill Does NOT Do |
Limitations section present |
| No H1 other than title | Single H1 only |
Sections use H2 (##) |
Consistent hierarchy |
3. Size Budget
| Metric | Limit | Rationale |
|---|---|---|
| SKILL.md lines | < 800 | ETH Zurich: more = worse perf |
| SKILL.md tokens | < 2500 | Context window budget |
| SKILL.md + references/ | < 3000 tokens | Total load budget |
| references/ file count | < 5 | Keep focused |
4. Portability
| Check | Rule |
|---|---|
| No tool-specific syntax | No Read, Write, Bash, Edit references |
| No platform-specific imports | No import, require, from in instructions |
| Natural language instructions | Steps readable by any agent |
| Graceful degradation | "If terminal available... otherwise..." pattern |
5. Freshness
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.
- 7d ago First seen · 120 lines · 30 tokens per session scan A 60b2f8c15c88
skill-quality-linter is a skill published in the GitHub repository BuilderCed/agent-skills (2 stars, last pushed 4mo ago), licensed MIT. It adds 30 tokens to every session and 970 once invoked, about $0.0002 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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