rest api design builder

    1

    Converts product requirements into scalable, standardized REST API design documents for engineering teams.

    $5

    Secure checkout via Stripe

    30-day refund guarantee

    Converts to your local currency at checkout

    0 installsSecurity scanned

    Works with the AI tools you already use

    Claude CodeClaude CodeCursorCursorCodex CLICodex CLIGitHub CopilotGitHub CopilotGemini CLIGemini CLI+20 more

    rest api design builder

    Example session with this skill installed

    Design a REST API for a task management system where users can create projects, assign tasks to members, and track status. I need pagination and a consistent error format.

    • Read your context and instructions
    • Compiled the rest api design
    • Generated the UI component

    I have designed the Task Management REST API based on your requirements. The design includes resource modeling for Users, Projects, and Tasks, including many-to-many relationships for assignments.

    Task Management API Design

    Resource Model

    ResourceFieldsRelationships
    Userid (UUID), email (String), name (String)Owns Projects, Assigned to Tasks
    Projectid (UUID), owner_id (UUID), title (String), status (Enum)Contains Tasks
    Taskid (UUID), project_id (UUID), title (String), due_date (ISO8601), priority (Int)Belongs to Project

    Primary Endpoints

    MethodEndpointDescription
    GET/v1/projectsList projects (Cursor pagination: starting_after, limit)
    POST/v1/projectsCreate a new project
    GET/v1/projects/{id}/tasksList tasks within a project
    POST/v1/projects/{id}/tasksCreate a task (Requires project ownership)
    PATCH/v1/tasks/{id}Update task status or assignee
    POST/v1/tasks/{id}/assignAssign user to task (Action-based sub-resource)

    Error Contract

    All errors use the following envelope

    {
  "error": {
    "code": "resource_not_found",
    "message": "The requested project does not exist.",
    "details": []
  }
}

    Request Example (POST /v1/projects)

    {
  "title": "Q4 Engineering Roadmap",
  "description": "Planning for upcoming sprints"
}

    Next steps

    1. Review the cursor-based pagination strategy for the /tasks endpoint.
    2. Confirm if the priority field should be an integer or a named enum.
    3. Export this design to an OpenAPI 3.1 specification.

    rest-api-design-builder.tsx

    TSX · React component

    Generated

    Example file from a real run - the skill writes it into your workspace.

    Connects securely to your tools. The creator never sees your data.

    What you get

    Map product requirements to resource-oriented API endpoints.Standardize error handling and pagination across all service endpoints.Define clear data schemas and relationship models for backend developers.Audit existing API proposals for REST best practices and consistency.

    About this skill

    The problem

    Engineers often start coding APIs before the contract is fully defined, leading to inconsistent endpoints, breaking changes, and integration friction. Product requirements rarely translate directly into clean, scalable REST patterns without manual architectural planning.

    What it does

    • Extracts entities and relationships from product briefs to model resource lifecycles and cardinality.
    • Defines a complete endpoint surface mapping CRUD and non-CRUD actions to proper HTTP methods.
    • Specifies request and response schemas including types, constraints, nullability, and example payloads.
    • Designs a uniform error contract with standardized envelopes and HTTP status mappings.
    • Develops strategies for pagination, filtering, search, and versioning based on industry standards.

    Why this beats prompting it yourself

    Generic prompts often produce shallow lists of endpoints that lack edge-case handling like idempotency, soft-delete semantics, or concurrency control. This skill follows a rigorous validation procedure to ensure the design is documentation-ready and extensible, preventing common architectural pitfalls like deep nesting or inconsistent error shapes.

    Use cases

    • Designing a greenfield API from a Jira epic or product requirement document.
    • Standardizing a messy legacy API into a consistent v1 contract.
    • Defining integration specs for a multi-team backend architecture.
    • Validating an API surface for internal consistency before writing a single line of code.

    Known limitations

    This tool focuses strictly on REST/HTTP resource-oriented designs. It does not support GraphQL, gRPC, or event-driven architectures, and does not generate implementation code or server scaffolds.

    How to install

    Works the same in every agent - Claude, Cursor, Codex, Copilot and 20+ more.

    ~30 seconds
    1. 1

      Download the ZIP

      Free skills download straight away. Paid skills unlock right after purchase.

    2. 2

      Unzip into your skills folder

      Every agent reads skills from one folder on your machine. Drop the unzipped folder in there.

    3. 3

      Ask your agent to use it

      Restart the agent if it was already running. It picks the skill up automatically - no config needed.

    Skills folder by agent

    Click the path to copy it. Create the folder if it does not exist yet.

    Reviews

    No reviews yet

    Be one of the first to try it. Every listed skill passes our trust checks below.

    Security scanned

    Passed our 8-point scan before listing

    Fresh listing

    Recently published to Agensi

    30-day refund

    Not a fit? Get your money back

    Trust & safety

    Security scanned

    Verified clean 7 days ago

    • Passed all security checks, Safe to install

    Listed7 days ago

    What's inside

    Frequently Asked Questions