node-patterns SKILL.md skillA
node-patterns from jdanigo/hydraia is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add jdanigo/hydraia/node-patterns@git:20260703.2ff8155Pins git:20260703.2ff8155 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- jdanigo/hydraia
- Path
skills/node-patterns/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260703.2ff8155, committed Jul 3, 2026
- Size
- 2,806 bytes
- Repository stars
- 8
- License
- MIT
Use when writing Node.js/TypeScript backend code — Express, Fastify, or NestJS services, APIs, workers. Builder playbook: project layout, async discipline, typed config, error taxonomy, DI boundaries, testing shape. Complements typescript-reviewer (this prevents, the reviewer catches).
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Node/TypeScript Backend Patterns
## Project layout
- Feature folders over layer folders: `src/orders/{orders.router,orders.service,orders.repo,orders.test}.ts` beats `src/{routes,services,repos}/orders.ts` scattered three places.
- One composition root (`src/app.ts`) wires everything; entry (`src/main.ts`) only boots. Handlers stay thin — parse/validate → service call → shape response.
## Async discipline
- No floating promises: every promise is awaited, returned, or explicitly `void`-ed with a comment. Unhandled rejection = crash in modern Node.
- Propagate `AbortSignal` through request-scoped work (fetch, DB timeouts); cancel on client disconnect for expensive handlers.
- No sync I/O (`readFileSync`, `execSync`) on request paths — boot time only.
- Concurrency with intent: `Promise.all` for independent work, `for…of await` when order matters, a limiter (`p-limit`) when fan-out is unbounded.
## Config
- Typed and validated at boot (zod or equivalent): missing/invalid env kills the process at startup with a clear message — never `process.env.X!` scattered through the codebase.
- One `config.ts` exports the parsed object; nothing else reads `process.env`.
## Errors
…Read the whole file at its exact version.
How to install
mdr add jdanigo/hydraia/node-patterns@sha256:d0252ad8998aa07dThe line at the top of this page pins the label git:20260703.2ff8155, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_ehyjbbeyxlxxreb6)
8 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Jul 3, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (2806 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
jdanigo/hydraia · 8 stars · license MIT · pushed 2026-09-24 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_ehyjbbeyxlxxreb6 GET https://markdownregistry.com/api/v1/resolve?ref=jdanigo/hydraia/node-patterns GET https://markdownregistry.com/api/v1/blob/d0252ad8998aa07d8a4f0f4686d4ff9540aff345faa1dfb3d859b74628b89d19
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.