Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/salavender/antigravity-compound-engineering-pluginnpx agentmods add skills/salavender/antigravity-compound-engineering-plugin/standard-security-authWrote 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/salavender/antigravity-compound-engineering-plugin/standard-security-auth)<a href="https://agentmods.dev/skills/salavender/antigravity-compound-engineering-plugin/standard-security-auth"><img src="https://agentmods.dev/badge/skills/salavender/antigravity-compound-engineering-plugin/standard-security-auth.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 | $0.00023 | $0.00859 |
| Opus 5 | $0.00012 | $0.00430 |
| Sonnet 5 | $0.00005 | $0.00172 |
| Haiku 4.5 | $0.00002 | $0.00086 |
Grade A, and why
standard-security-auth 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- standard-security-auth — 100% identical, 0 lines differ
How it starts
The opening of the file, as written. The whole thing — 128 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Security & Authentication Specialist
Overview
An expert agent specializing in the project's authentication system, security patterns, and API integration. This agent understands JWT, cookie-based, and multi-factor authentication flows, as well as proxy architectures for secure backend communication.
When To Use
- Authentication Implementation: When implementing or modifying auth flows
- Security Review: When reviewing code for security vulnerabilities
- API Integration: When connecting new features to the auth system
- MFA/Role-based Logic: When working with multi-factor authentication or role-based access
- Audit Compliance: When ensuring code follows audit logging requirements
Instrumentation
# Log usage when using this skill
./scripts/log-skill.sh "standard-security-auth" "manual" "$$"
What do you want to do?
- Implement Authentication Flow → See "Auth Flow Patterns" below
- Review Security Vulnerabilities → See "Security Checklist" below
- Connect API to Auth System → See "API Integration" below
- MFA/Role-based Access → See "Role Management" below
- Audit & Compliance → See "Audit Patterns" below
Auth Flow Patterns
Cookie-Based Authentication
- Use the standard API client for calls that require authentication
- Never manually attach Authorization headers in cookie mode
- The middleware automatically handles JWT validation and refresh
- Session state is maintained in a centralized
AuthContext
JWT Token Management
- Tokens are stored in HttpOnly cookies for security
- Middleware handles proactive refresh before expiration
- Multi-Factor Authentication (MFA) sessions require secondary verification
- Role-based access is enforced at both middleware and component levels
Security Checklist
Critical Security Checks
- All API calls use the canonical API client
- No hardcoded API URLs or fallbacks (use environment variables)
- Middleware route protection is properly configured
- Role-based access control is enforced at both frontend and backend
- No sensitive data is stored in unencrypted local storage
- Content Security Policy (CSP) headers are properly applied
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 · 128 lines · 23 tokens per session scan A ba4ef438ae69
standard-security-auth is a skill published in the GitHub repository salavender/antigravity-compound-engineering-plugin (47 stars, last pushed 23d ago), licensed MIT. It adds 23 tokens to every session and 859 once invoked, about $0.0001 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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