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 roedyrustam/vibes-plug --skill js-backend-expertgit clone --depth 1 https://github.com/roedyrustam/vibes-plugWrote 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/roedyrustam/vibes-plug/js-backend-expert)<a href="https://agentmods.dev/skills/roedyrustam/vibes-plug/js-backend-expert"><img src="https://agentmods.dev/badge/skills/roedyrustam/vibes-plug/js-backend-expert/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/roedyrustam/vibes-plug/js-backend-expert"><img src="https://agentmods.dev/badge/skills/roedyrustam/vibes-plug/js-backend-expert.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00077 | $0.03067 |
| Opus 5 | $0.00039 | $0.01533 |
| Sonnet 5 | $0.00015 | $0.00613 |
| Haiku 4.5 | $0.00008 | $0.00307 |
Grade A, and why
js-backend-expert scanned grade A with 1 finding 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 5d 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
async fetch(request: Request, env: Env): Promise<Response> { How it starts
The opening of the file, as written. The whole thing — 220 lines — stays where its author put it; the contents beside it link to each section on GitHub.
JS Backend Expert (Node.js 24 LTS / Bun 1.2 / Deno 2.x Edition)
English
Description
Production-grade guidance for building fast, scalable, and resilient JavaScript/TypeScript backend APIs, microservices, and serverless functions across Node.js 24 (LTS), Bun 1.2+, and Deno 2.x. Covers high-throughput frameworks (Fastify 5, Hono, Express 5, NestJS), type-safe ORMs (Drizzle, Prisma 6), Hono RPC for type-safe full-stack communication, Edge Runtime patterns, WebSockets, BullMQ background jobs, and graceful shutdown handling.
Trigger Conditions
- Bootstrapping or refactoring a Node.js, Bun, or Deno backend application or microservice.
- Writing RESTful, GraphQL, WebSocket, or SSE (Server-Sent Events) API endpoints.
- Developing web servers using Fastify 5, Hono, Express 5, or NestJS.
- Building type-safe full-stack apps with Hono RPC or tRPC.
- Deploying backend logic to Edge Runtimes (Cloudflare Workers, Vercel Edge).
- Interacting with databases using Drizzle ORM, Prisma 6, or Kysely.
- Setting up background job processing with BullMQ and Redis.
- Implementing rate limiting, CORS, Content Security Policy (CSP), and JWT/Session authentication.
- Writing backend tests using Vitest, Supertest, or Node's native
node:testrunner.
Runtime Matrix (Node.js 24 vs Bun 1.2 vs Deno 2.x)
| Feature / Runtime | Node.js 24 (LTS) | Bun 1.2+ | Deno 2.x |
|---|---|---|---|
| Module Standard | Native ESM / CJS | Native ESM / CJS | Native ESM |
.env Loading |
Native --env-file |
Native | Native |
| TypeScript Execution | Native --experimental-strip-types / tsx |
Native (Zero-config) | Native (Zero-config) |
| HTTP Server | node:http / Fastify |
Bun.serve() / Hono |
Deno.serve() / Hono |
| Native WebSockets | Built-in (WebSocket) |
Built-in (Bun.serve) |
Built-in (Deno.upgradeWebSocket) |
| Package Manager | npm / pnpm | bun (built-in) | npm / jsr |
| Test Runner | node:test / Vitest |
bun test |
deno test |
| Edge Deploy | Vercel Serverless | Railway / Fly.io | Deno Deploy |
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.
- 5d ago First seen · 220 lines · 77 tokens per session scan A c87e2c1dae4c
js-backend-expert is a skill published in the GitHub repository roedyrustam/vibes-plug (50 stars, last pushed yesterday), licensed MIT. It adds 77 tokens to every session and 3,067 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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