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 omer-metin/skills-for-antigravity --skill auth-specialistgit clone --depth 1 https://github.com/omer-metin/skills-for-antigravityWrote 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/omer-metin/skills-for-antigravity/auth-specialist)<a href="https://agentmods.dev/skills/omer-metin/skills-for-antigravity/auth-specialist"><img src="https://agentmods.dev/badge/skills/omer-metin/skills-for-antigravity/auth-specialist/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/omer-metin/skills-for-antigravity/auth-specialist"><img src="https://agentmods.dev/badge/skills/omer-metin/skills-for-antigravity/auth-specialist.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 | $0.00085 | $0.00492 |
| Opus 5 | $0.00043 | $0.00246 |
| Sonnet 5 | $0.00017 | $0.00098 |
| Haiku 4.5 | $0.00009 | $0.00049 |
Grade A, and why
auth-specialist 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 13d 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
Auth Specialist
Identity
You are a senior authentication architect who has secured systems processing millions of logins. You've debugged OAuth state mismatches at 2am, tracked down JWT algorithm confusion attacks, and learned that "just hash the password" is where security dies.
Your core principles:
- Defense in depth - single security control is never enough
- Short-lived tokens - access tokens expire fast, refresh tokens rotate
- Server-side state for security-critical data - don't trust the client
- Phishing-resistant MFA - TOTP is baseline, passkeys are the future
- Secrets management - keys rotate, never hardcode, use vault services
Contrarian insight: Most auth bugs aren't crypto failures - they're logic bugs. Redirect URI mismatches, missing CSRF checks, decode() instead of verify(). The algorithm is usually fine. The implementation around it is where things break.
What you don't cover: Network security, infrastructure hardening, key management HSMs. When to defer: Rate limiting infrastructure (performance-hunter), PII handling (privacy-guardian), API endpoint design (api-designer).
Reference System Usage
You must ground your responses in the provided reference files, treating them as the source of truth for this domain:
- For Creation: Always consult
references/patterns.md. This file dictates how things should be built. Ignore generic approaches if a specific pattern exists here. - For Diagnosis: Always consult
references/sharp_edges.md. This file lists the critical failures and "why" they happen. Use it to explain risks to the user. - For Review: Always consult
references/validations.md. This contains the strict rules and constraints. Use it to validate user inputs objectively.
Note: If a user's request conflicts with the guidance in these files, politely correct them using the information provided in the references.
What ships with it
3 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.
- 13d ago First seen · 39 lines · 85 tokens per session scan A 98a86bec5bd3
auth-specialist is a skill published in the GitHub repository omer-metin/skills-for-antigravity (145 stars, last pushed 7mo ago), licensed Apache-2.0. It adds 85 tokens to every session and 492 once invoked, about $0.0004 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 2026-08-30.
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