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/himself65/auth-spec/security-best-practicenpx skills add himself65/auth-spec --skill security-best-practicegit clone --depth 1 https://github.com/himself65/auth-specWhat 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 | $0.00058 | $0.02038 |
| Opus 5 | $0.00029 | $0.01019 |
| Sonnet 5 | $0.00012 | $0.00408 |
| Haiku 4.5 | $0.00006 | $0.00204 |
Grade A, and why
security-best-practice scanned grade A with 1 finding 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 3d 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.
Asks for rootlowPrivilege escalation
A mod that escalates privileges can change anything on the machine, not only the project.
- `rules/session-security.md` — Token generation, `__Host-`/`__Secure-`/`Partitioned` cookies, JWT pitfalls, session fixation, freshness (sudo mode), rotation on state change Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.
The source is not reproduced here
No licence file
A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.
What ships with it
12 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.
- rules/_sections.md 1.6 KB
- rules/_template.md 474 B
- rules/credential-storage.md 5.2 KB
- rules/csrf-protection.md 11 KB
- rules/error-handling.md 6.4 KB
- rules/http-security-headers.md 6.5 KB
- rules/input-validation.md 13 KB
- rules/mfa-passkeys.md 8.4 KB
- rules/oauth-oidc.md 20 KB
- rules/rate-limiting.md 5.9 KB
- rules/session-security.md 14 KB
- rules/token-lifecycle.md 12 KB
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.
- 3d ago First seen · 118 lines · 58 tokens per session scan A 0612f8b7c25f
security-best-practice is a skill published in the GitHub repository himself65/auth-spec (41 stars, last pushed 11d ago), with no licence file. It adds 58 tokens to every session and 2,038 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 1 finding (asks for root). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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