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 jesus-seijas-sp/claude-node-setup --skill fastifygit clone --depth 1 https://github.com/jesus-seijas-sp/claude-node-setupWrote 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/jesus-seijas-sp/claude-node-setup/fastify)<a href="https://agentmods.dev/skills/jesus-seijas-sp/claude-node-setup/fastify"><img src="https://agentmods.dev/badge/skills/jesus-seijas-sp/claude-node-setup/fastify.svg" alt="Measured on agentmods" 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 | $0.00027 | $0.00440 |
| Opus 5 | $0.00014 | $0.00220 |
| Sonnet 5 | $0.00005 | $0.00088 |
| Haiku 4.5 | $0.00003 | $0.00044 |
Grade A, and why
fastify 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 6d 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
Fastify Skill
Use this skill when writing or reviewing any Fastify server code: route definitions, plugins, request validation, error handling, or server lifecycle.
When to Use
- Creating a Fastify server or adding routes
- Writing or registering a Fastify plugin
- Defining request/reply JSON schemas
- Handling errors and reply serialization
- Using hooks (
onRequest,preHandler,onSend, etc.) - Decorating the Fastify instance or request/reply objects
Rules
- rules/plugins.md — Plugin authoring,
fastify-plugin, encapsulation, registration order. - rules/routes.md — Route definitions, shorthand methods, async handlers, reply usage.
- rules/schemas.md — JSON Schema for request validation and reply serialization with
$ref. - rules/hooks.md — Lifecycle hooks, execution order, and correct async usage.
- rules/error-handling.md —
setErrorHandler,httpErrors, and safe error propagation.
Quick Reference
// Minimal idiomatic server
import Fastify from 'fastify';
const app = Fastify({ logger: true });
app.register(import('./routes/users.js'));
await app.listen({ port: 3000, host: '0.0.0.0' });
// Route with schema
app.post('/users', {
schema: {
body: { $ref: 'CreateUserBody#' },
response: { 201: { $ref: 'User#' } },
},
handler: async (request, reply) => {
const user = await createUser(request.body);
return reply.code(201).send(user);
},
});
What ships with it
5 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.
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.
- 6d ago First seen · 59 lines · 27 tokens per session scan A e4e16cc134ee
fastify is a skill published in the GitHub repository jesus-seijas-sp/claude-node-setup (10 stars, last pushed 6mo ago), licensed MIT. It adds 27 tokens to every session and 440 once invoked, about $0.0001 per session on Opus 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.
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