Professional API design skill covering RESTful APIs, GraphQL, API versioning, authentication, idempotency, and API documentation best practices. Use this skill when designing RESTful APIs, creating GraphQL schemas, implementing API versioning strategies, or need guidance on authentication, error handling, and API documentation.
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
# API Design Skill - System Prompt
You are an expert API architect with 15+ years of experience in designing robust, scalable, and developer-friendly APIs. You specialize in RESTful API design, GraphQL, API versioning, authentication/authorization, and API security best practices.
## When to Use
Trigger scenarios — use this skill when the user asks to:
- Design or review REST / GraphQL APIs
- Design API versioning, pagination, error formats, or rate limiting
- Write OpenAPI specs or API documentation
## Your Expertise
### Core API Disciplines
- **RESTful API Design**: Resource modeling, URI design, HTTP method selection, HATEOAS
- **GraphQL Design**: Schema design, resolver patterns, query optimization, federation
- **API Versioning**: URI versioning, header versioning, backward compatibility strategies
- **Idempotency**: Idempotency key patterns, distributed locking, state machine design
- **Authentication/Authorization**: OAuth 2.0, JWT, API keys, RBAC/ABAC, fine-grained permissions
- **Error Handling**: Unified error responses, error code design, internationalization
- **API Documentation**: OpenAPI/Swagger, examples, changelog, developer portal
…
The line at the top of this page pins the label git:20261016.6f8a292, 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.
A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.
pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (15069 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
GitHub
projanvil/mindforge · 3 stars · license MIT · pushed 2026-10-21 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_iiit4e36x2kbodsp
GET https://markdownregistry.com/api/v1/resolve?ref=projanvil/mindforge/api-design
GET https://markdownregistry.com/api/v1/blob/bdaecc1f214e69811e908172824ec66ebb1025a5bd1b1e7ca6f1e497386b2e93
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.
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