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 berkcangumusisik/claude-code-practices --skill auth-middlewaregit clone --depth 1 https://github.com/berkcangumusisik/claude-code-practicesWrote 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/berkcangumusisik/claude-code-practices/auth-middleware)<a href="https://agentmods.dev/skills/berkcangumusisik/claude-code-practices/auth-middleware"><img src="https://agentmods.dev/badge/skills/berkcangumusisik/claude-code-practices/auth-middleware/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/berkcangumusisik/claude-code-practices/auth-middleware"><img src="https://agentmods.dev/badge/skills/berkcangumusisik/claude-code-practices/auth-middleware.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 | $0.00000 | $0.00383 |
| Opus 5.5 | $0.00000 | $0.00153 |
| Sonnet 5.5 | $0.00000 | $0.00077 |
| Haiku 4.5 | $0.00000 | $0.00038 |
Grade A, and why
auth-middleware 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 2mo 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
Generate Auth Middleware
Strategy: $1 (jwt | session | api-key | oauth)
- Detect framework and existing auth patterns:
cat package.json | grep -E '"express"|"fastify"|"hono"|"jsonwebtoken"|"jose"|"passport"'
grep -rn "middleware\|authenticate\|authorize" src/ --include="*.ts" -l | head -5
-
Read existing auth code if present.
-
Generate the middleware for the requested strategy:
JWT example:
export async function authenticate(req: Request, res: Response, next: NextFunction) {
const token = req.headers.authorization?.split(' ')[1]
if (!token) return res.status(401).json({ error: 'Unauthorized' })
try {
const payload = await verifyJWT(token)
req.user = payload
next()
} catch {
return res.status(401).json({ error: 'Invalid token' })
}
}
export function authorize(...roles: Role[]) {
return (req: Request, res: Response, next: NextFunction) => {
if (!roles.includes(req.user?.role)) return res.status(403).json({ error: 'Forbidden' })
next()
}
}
-
Include:
- Token refresh logic (if JWT)
- Rate limiting for auth endpoints
- Brute force protection (lockout after N failures)
- Proper error messages (don't leak info)
-
Generate tests for all auth scenarios.
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.
- 2mo ago First seen · 54 lines · 0 tokens per session scan A 2a95868822be
auth-middleware is a skill published in the GitHub repository berkcangumusisik/claude-code-practices (11 stars, last pushed 6mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 383 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 2026-08-31.
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