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 skills/threat-vector-security/guardian-agent/using-skillsnpx skills add Threat-Vector-Security/guardian-agent --skill using-skillsgit clone --depth 1 https://github.com/Threat-Vector-Security/guardian-agentWrote 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/threat-vector-security/guardian-agent/using-skills)<a href="https://agentmods.dev/skills/threat-vector-security/guardian-agent/using-skills"><img src="https://agentmods.dev/badge/skills/threat-vector-security/guardian-agent/using-skills.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 | $0.00000 | $0.00279 |
| Opus 5 | $0.00000 | $0.00139 |
| Sonnet 5 | $0.00000 | $0.00056 |
| Haiku 4.5 | $0.00000 | $0.00028 |
Grade A, and why
using-skills 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 6d 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.
What it actually says
Using Skills
Use this as a bootstrap workflow when the user explicitly wants help choosing or applying the right skill.
Workflow
- Check whether the task clearly maps to an existing process skill, domain skill, or both.
- Prefer one process skill and one domain skill over loading many overlapping skills.
- Read the relevant
SKILL.mdfiles before acting; do not rely on memory of their contents. - If no skill clearly applies, proceed without forcing one.
Selection Rules
- Prefer the narrowest skill that matches the user's actual request.
- Prefer native skills and managed-provider integrations over reviewed third-party skills when both cover the same area.
- Reviewed third-party skills may be enabled, but treat them as narrower and lower-priority than first-party skills unless the user explicitly names the product or the match is unusually specific.
- Do not treat marketplace popularity as a reason to use a skill.
Pairing Pattern
- process + domain is usually enough
- more than two skills should be rare
- if two skills conflict, pick the one with the tighter trigger and more relevant tool surface
Gotchas
- Do not load multiple overlapping domain skills when one narrower skill fits.
- Do not assume marketplace popularity means the skill is appropriate or safe.
- Do not rely on memory of a skill body when the skill is clearly relevant; read it first.
What ships with it
1 file 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.
- 6d ago First seen · 30 lines · 0 tokens per session scan A 0e4159f7fa85
using-skills is a skill published in the GitHub repository Threat-Vector-Security/guardian-agent (11 stars, last pushed today), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 279 tokens. 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 2026-08-30.
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