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 Benja-Pauls/SerpentStack --skill clerkgit clone --depth 1 https://github.com/Benja-Pauls/SerpentStackWrote 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/benja-pauls/serpentstack/clerk)<a href="https://agentmods.dev/skills/benja-pauls/serpentstack/clerk"><img src="https://agentmods.dev/badge/skills/benja-pauls/serpentstack/clerk/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/benja-pauls/serpentstack/clerk"><img src="https://agentmods.dev/badge/skills/benja-pauls/serpentstack/clerk.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 | $0.00059 | $0.00893 |
| Opus 5.5 | $0.00024 | $0.00357 |
| Sonnet 5.5 | $0.00012 | $0.00179 |
| Haiku 4.5 | $0.00006 | $0.00089 |
Grade A, and why
clerk 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 — 90 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Clerk Skills Router
Version Detection
Check package.json to determine the Clerk SDK version. This determines which patterns to use:
| Package | Core 2 (LTS until Jan 2027) | Current |
|---|---|---|
@clerk/nextjs |
v5–v6 | v7+ |
@clerk/react or @clerk/clerk-react |
v5–v6 | v7+ |
@clerk/expo or @clerk/clerk-expo |
v1–v2 | v3+ |
@clerk/react-router |
v1–v2 | v3+ |
@clerk/tanstack-react-start |
< v0.26.0 | v0.26.0+ |
Default to current if the version is unclear or the project is new. Core 2 packages use @clerk/clerk-react and @clerk/clerk-expo (with clerk- prefix); current packages use @clerk/react and @clerk/expo.
All skills are written for the current SDK. When something differs in Core 2, it's noted inline with > **Core 2 ONLY (skip if current SDK):** callouts. The exception is clerk-custom-ui, which has separate core-2/ and core-3/ directories for custom flow hooks since those APIs are entirely different between versions.
By Task
Adding Clerk to your project → Use clerk-setup
- Framework detection and quickstart
- Environment setup, API keys, Keyless flow
- Migration from other auth providers
Custom sign-in/sign-up UI → Use clerk-custom-ui
- Custom authentication flows with
useSignIn/useSignUphooks - Appearance and styling (themes, colors, layout)
<Show>component for conditional rendering
Advanced Next.js patterns → Use clerk-nextjs-patterns
- Server vs Client auth APIs
- Middleware strategies
- Server Actions, caching
- API route protection
B2B / Organizations → Use clerk-orgs
- Multi-tenant apps
- Organization slugs in URLs
- Roles, permissions, RBAC
- Member management
Webhooks → Use clerk-webhooks
- Real-time events
- Data syncing
- Notifications & integrations
E2E Testing → Use clerk-testing
- Playwright/Cypress setup
- Auth flow testing
- Test utilities
Swift / native iOS auth → Use clerk-swift
- Native iOS Swift and SwiftUI projects
- ClerkKit and ClerkKitUI implementation guidance
- Source-driven patterns from
clerk-ios
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 · 90 lines · 59 tokens per session scan A acfa6c532bea
clerk is a skill published in the GitHub repository Benja-Pauls/SerpentStack (2 stars, last pushed 6mo ago), licensed MIT. It adds 59 tokens to every session and 893 once invoked, about $0.0002 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 2026-08-31.
Other skills, from other repositories
printing-press-amend
Amend a published CLI from one of two input sources: (1) dogfood mode mines the active Claude Code session transcript for friction (missing flags, hand- rolled API payloads, silent-null returns); (2) direct-input mode accepts user-supplied asks (rename a command, add commands or feeds, fix a named bug, optionally…
groq-inference
Ultra-fast LLM inference on custom LPU hardware. OpenAI-compatible API at api.groq.com. Lowest latency in the industry (500-1000+ tok/s). Supports chat completions, vision, audio (Whisper STT + TTS), tool calling, JSON mode, and streaming. Free tier available. Inference only — no training.
wikipedia
Search and read Wikipedia via x wkp — MediaWiki API, no API key, zero install; query, extract, suggest, and DDG route in one module. Load for wiki, wikipedia, encyclopedia lookup, article summary.
cve
Look up CVE records via x cve — cached, zero-API-key, daily xz TSV. Load for cve, vulnerability id, kev, epss, nvd, cvelist, or security advisory.
voiden
Create and edit Voiden .void files for API testing. Covers the .void file format and all enabled extension block types.
csharp-dotnet
Use when writing, reviewing, testing, or shipping C# / .NET code — ASP.NET Core APIs (minimal APIs vs controllers), EF Core data access, async correctness, solution layout in .cs/.csproj/.sln. NOT a Java/Spring backend (that is spring-boot), NOT a Node/TypeScript backend (that is nestjs), NOT framework-neutral REST…