Borrowing it
Nothing to install: this file belongs to vvedantb/eva. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/vvedantb/eva/main/.agents/skills/clerk-nextjs-patterns/SKILL.mdgit clone --depth 1 https://github.com/vvedantb/evaWrote 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/vvedantb/eva/clerk-nextjs-patterns)<a href="https://agentmods.dev/skills/vvedantb/eva/clerk-nextjs-patterns"><img src="https://agentmods.dev/badge/skills/vvedantb/eva/clerk-nextjs-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/vvedantb/eva/clerk-nextjs-patterns"><img src="https://agentmods.dev/badge/skills/vvedantb/eva/clerk-nextjs-patterns.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 2 findings, up to medium
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 →
- medium Data Exfiltration · line 150 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
- medium Data Exfiltration · line 171 Data is being sent to an external URL. This could be legitimate telemetry or data exfiltration. Manual review is recommended.Fix: Verify the destination URL is trusted and necessary. Remove or replace with documented APIs. Ensure no secrets, tokens, or PII are transmitted.
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 | $0.00021 | $0.02162 |
| Opus 5.5 | $0.00008 | $0.00865 |
| Sonnet 5.5 | $0.00004 | $0.00432 |
| Haiku 4.5 | $0.00002 | $0.00216 |
Grade A, and why
clerk-nextjs-patterns 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- clerk-nextjs-patterns — 88% identical, 94 lines differ
How it starts
The opening of the file, as written. The whole thing — 263 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Next.js Patterns
Version: Check
package.jsonfor the SDK version — seeclerkskill for the version table. Core 2 differences are noted inline with> **Core 2 ONLY (skip if current SDK):**callouts.
For basic setup, see clerk-setup skill.
What Do You Need?
| Task | Reference |
|---|---|
Server vs client auth (auth() vs hooks) |
references/server-vs-client.md |
| Configure middleware (public-first vs protected-first) | references/middleware-strategies.md |
| Protect Server Actions | references/server-actions.md |
| API route auth (401 vs 403) | references/api-routes.md |
| Cache auth data (user-scoped caching) | references/caching-auth.md |
References
| Reference | Description |
|---|---|
references/server-vs-client.md |
await auth() vs hooks |
references/middleware-strategies.md |
Public-first vs protected-first, proxy.ts (Next.js <=15: middleware.ts) |
references/server-actions.md |
Protect mutations |
references/api-routes.md |
401 vs 403 |
references/caching-auth.md |
User-scoped caching |
Mental Model
Server vs Client = different auth APIs:
- Server:
await auth()from@clerk/nextjs/server(async!) - Client:
useAuth()hook from@clerk/nextjs(sync)
Never mix them. Server Components use server imports, Client Components use hooks.
What ships with it
11 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.
- evals/evals.json 4.8 KB
- references/api-routes.md 1.4 KB
- references/caching-auth.md 1.3 KB
- references/middleware-strategies.md 3.7 KB
- references/server-actions.md 1.6 KB
- references/server-vs-client.md 2.3 KB
- templates/nextjs-basic-auth/app/layout.tsx 584 B
- templates/nextjs-basic-auth/app/page.tsx 59 B
- templates/nextjs-basic-auth/package.json 363 B
- templates/nextjs-basic-auth/proxy.ts 283 B runs code
- templates/nextjs-basic-auth/tsconfig.json 576 B
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 · 263 lines · 21 tokens per session scan A 67a7f0a6b314
clerk-nextjs-patterns is a skill published in the GitHub repository vvedantb/eva (101 stars, last pushed today), licensed MIT. It adds 21 tokens to every session and 2,162 once invoked, about $0.0001 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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subscriptions
Set up real-time event streams with async generator subscriptions using .subscription(async function() { yield }). SSE via httpSubscriptionLink is recommended over WebSocket. Use tracked(id, data) from @trpc/server for reconnection recovery with lastEventId. WebSocket via wsLink and createWSClient from @trpc/client…
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non-json-content-types
Handle FormData, file uploads, Blob, Uint8Array, and ReadableStream inputs in tRPC mutations. Use octetInputParser from @trpc/server/http for binary data. Route non-JSON requests with splitLink and isNonJsonSerializable() from @trpc/client. FormData and binary inputs only work with mutations (POST).
server-side-calls
Call tRPC procedures directly from server code using t.createCallerFactory() and router.createCaller(context) for integration testing, internal server logic, and custom API endpoints. Catch TRPCError and extract HTTP status with getHTTPStatusCodeFromError(). Error handling via onError option.