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 latestaiagents/agent-skills --skill skill-frontmattergit clone --depth 1 https://github.com/latestaiagents/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/latestaiagents/agent-skills/skill-frontmatter)<a href="https://agentmods.dev/skills/latestaiagents/agent-skills/skill-frontmatter"><img src="https://agentmods.dev/badge/skills/latestaiagents/agent-skills/skill-frontmatter/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/latestaiagents/agent-skills/skill-frontmatter"><img src="https://agentmods.dev/badge/skills/latestaiagents/agent-skills/skill-frontmatter.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 | $0.00098 | $0.01331 |
| Opus 5 | $0.00049 | $0.00665 |
| Sonnet 5 | $0.00020 | $0.00266 |
| Haiku 4.5 | $0.00010 | $0.00133 |
Grade A, and why
skill-frontmatter 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 5d 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.
Skill Frontmatter
The frontmatter is what the model reads to decide whether to load your skill. Get it wrong and the skill never fires.
When to Use
- Authoring a new SKILL.md
- Debugging "my skill isn't activating"
- Reviewing a PR that adds a skill
Required Fields
---
name: kebab-case-name
description: |
Sentence 1: what the skill does.
Sentence 2: when to use it (specific trigger conditions).
Sentence 3: activation keywords (phrases users say).
---
That's it. name and description. Nothing else is required by most clients.
The name Field
- Kebab-case —
merge-conflict-surgeon, notMergeConflictSurgeon - Matches directory name — directory holding the
SKILL.mdmust have the same name - Verb-led or role-led:
- Action:
resolve-merge-conflict - Role:
owasp-auditor - Topic:
mcp-server-authoring
- Action:
- Unique across your skill set — two skills with the same name collide
The description Field
This is THE activation signal. Model reads it and matches against the user's message.
Three-sentence structure
- What — one sentence on the skill's purpose (action-first)
- When — specific trigger conditions
- Keywords — phrases users actually say
description: |
Systematic merge conflict resolution with context analysis and safe resolution.
Use this skill when the user has merge conflicts, needs help resolving conflicting changes, or is stuck on a rebase.
Activate when: merge conflict, conflict resolution, git merge failed, rebase conflict, CONFLICT markers.
Length
- Minimum: 2 sentences. Shorter = under-specified; misses activations
- Sweet spot: 3-5 sentences, ~60-150 words
- Maximum: don't exceed ~200 words; longer dilutes the signal
Voice
- Second-person or imperative
- Specific, not abstract: "when user is debugging a null pointer in Java" beats "helps with bugs"
- Name the tools/frameworks —
tsc,Next.js,LangGraphetc. Users and models match on these
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.
- 5d ago First seen · 164 lines · 98 tokens per session scan A c6af78d3e7b5
skill-frontmatter is a skill published in the GitHub repository latestaiagents/agent-skills (5 stars, last pushed 4mo ago), licensed MIT. It adds 98 tokens to every session and 1,331 once invoked, about $0.0005 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 2026-09-03.
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