rest api design builder

    1

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

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    Claude CodeClaude CodeCursorCursorCodex CLICodex CLIMuseMuseDotsDots+21 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

    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.

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

    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.

    Strictly for REST/HTTP. No GraphQL or gRPC. No code generation or server scaffolding. Requires a product brief or requirements to start.

    How to use

    1. 1

      Connect your agent to the Agensi MCP

      Copy the prompt and paste it into Claude, ChatGPT, Cursor or any agent that supports MCP. It sets up the connection for you. Manual setup

    2. 2

      Sign in to Agensi

      Your agent shows a sign-in link. Sign in and click Allow.

    3. 3

      Ask for what you need

      Your agent loads this skill and uses it on your task. It always asks before any payment.

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    What's inside

    Frequently Asked Questions

    This skill converts raw product requirements or Jira epics into comprehensive REST API design documents, including resource modeling, endpoint mappings, and standardized error contracts, ensuring a consistent architecture before coding begins.

    The design documents are platform-agnostic; you can use the output to manually build your API or feed it into documentation tools like Swagger/OpenAPI for any backend framework, such as Node.js, Python, or Go.

    You receive the full architectural logic for defining entities, CRUD actions, schema constraints, and advanced patterns like pagination and versioning, ready to be deployed within your preferred AI agent environment.

    No, this skill is purpose-built for RESTful, resource-oriented architectures; it does not currently support GraphQL, gRPC, or event-driven messaging patterns.

    Unlike generic prompts, this skill uses a specialized validation procedure to ensure 'best-practice' standards, such as proper idempotency, consistent error envelopes, and scalable resource nesting that generic models often overlook.

    Simply upload your product brief or requirement document to the agent; the skill will then analyze the entities and relationships to generate a structured API contract.

    New in APIs & Backend