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 LambdaTest/agent-skills --skill api-security-patternsgit clone --depth 1 https://github.com/LambdaTest/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/lambdatest/agent-skills/api-security-patterns)<a href="https://agentmods.dev/skills/lambdatest/agent-skills/api-security-patterns"><img src="https://agentmods.dev/badge/skills/lambdatest/agent-skills/api-security-patterns/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/lambdatest/agent-skills/api-security-patterns"><img src="https://agentmods.dev/badge/skills/lambdatest/agent-skills/api-security-patterns.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Privilege Escalation · line 47 Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.Fix: Remove references to credential paths. Use environment variables or secrets managers. For docs, use placeholder paths (e.g., /path/to/config). Never load .env or token files in production code paths.
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 | $0.00166 | $0.01359 |
| Opus 5.5 | $0.00066 | $0.00544 |
| Sonnet 5.5 | $0.00033 | $0.00272 |
| Haiku 4.5 | $0.00017 | $0.00136 |
Grade A, and why
api-security-auth-pattern 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 1mo 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 — 176 lines — stays where its author put it; the contents beside it link to each section on GitHub.
API Security & Auth Skill
Design complete authentication and security layers for any API.
Auth Pattern Selection Guide
| Use Case | Recommended Pattern |
|---|---|
| User-facing web/mobile app | OAuth 2.0 + JWT (Authorization Code + PKCE) |
| Server-to-server (M2M) | OAuth 2.0 Client Credentials + JWT |
| Simple 3rd party access | API Key (header) |
| High-security enterprise | mTLS + short-lived JWT |
| Microservices internal | JWT propagation or service mesh (mTLS) |
| Webhook verification | HMAC-SHA256 signature header |
OAuth 2.0 Flow Endpoints
POST /auth/oauth/authorize — redirect user to consent screen
POST /auth/oauth/token — exchange code for tokens
POST /auth/oauth/token/refresh — refresh access token
POST /auth/oauth/revoke — revoke token
GET /auth/oauth/userinfo — get user profile from token
Token endpoint request
{
"grant_type": "authorization_code",
"code": "AUTH_CODE",
"redirect_uri": "https://app.example.com/callback",
"client_id": "CLIENT_ID",
"code_verifier": "PKCE_VERIFIER"
}
Token response
{
"access_token": "eyJhbGci...",
"token_type": "Bearer",
"expires_in": 3600,
"refresh_token": "rt_...",
"scope": "read write"
}
JWT Design
Header: { "alg": "RS256", "typ": "JWT" }
Claims payload:
{
"sub": "user-uuid",
"iss": "https://auth.example.com",
"aud": "https://api.example.com",
"exp": 1700000000,
"iat": 1699996400,
"jti": "unique-token-id",
"roles": ["admin", "editor"],
"tenant_id": "org-uuid",
"scope": "read:users write:posts"
}
Validation checklist: verify iss, aud, exp, nbf; reject alg: none; check token revocation list.
RBAC Design
Roles: super_admin > admin > editor > viewer > guest
Resources: users, posts, settings, billing, reports
Permission matrix:
users posts settings billing reports
super_admin: CRUD CRUD CRUD CRUD R
admin: CRUD CRUD R R R
editor: R CRUD - - R
viewer: R R - - R
guest: - R(pub) - - -
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.
- 1mo ago First seen · 176 lines · 166 tokens per session scan A bf8405bc4c3e
api-security-auth-pattern is a skill published in the GitHub repository LambdaTest/agent-skills (376 stars, last pushed 6d ago), licensed MIT. It adds 166 tokens to every session and 1,359 once invoked, about $0.0007 per session on Opus 5.5. 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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