Api Designer

    5

    Professional API design and review skill for REST, GraphQL, and event-driven architectures.

    $5

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    Works with the AI tools you already use

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

    api-designer

    Example session with this skill installed

    Design a REST endpoint for creating a new order. Include the request/response shapes, use UUIDs for IDs, and define a specific error case for invalid inventory items.

    • Read your context and instructions
    • Compiled the api-designer
    • Generated the UI component

    API Style: REST
    Resource: /orders
    POST /orders: Creates a pending order.
    Request: { userId: UUID, items: Array<SKU> }
    Response: 201 Created { id: UUID, status: 'pending', total: Decimal }
    Error: 422 Unprocessable Entity for invalid SKUs with error_code 'INVALID_INVENTORY'.

    api-designer.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

    Generate OpenAPI specs from resource-based data modelsValidate API designs against industry-standard naming conventionsMap GraphQL schemas to legacy REST backend endpointsDraft async event schemas for message-driven architecturesAutomate versioning strategies for backward compatibility checks

    About this skill

    What it does

    The API Designer skill provides a structured framework for architects and developers to build robust, scalable interfaces. It moves beyond simple endpoint sketching to cover resource modeling, lifecycle states, and contract-first documentation for REST, GraphQL, and event-driven systems.

    Why use this skill

    Designing an API is easy; designing a consistent API that survives internal scaling and public consumption is hard. This skill automates the architectural heavy lifting by enforcing standardized strategies for pagination, error handling, and versioning. Instead of wasting time on debating naming conventions or status codes, the agent applies industry best practices to ensure your contracts are predictable and maintainable.

    Supported workflows

    • Contract-First Design: Detailed modeling of resources, actions, and request/response shapes before a single line of code is written.
    • API Auditing: Comprehensive reviews targeting issue severity, design risks, and backward compatibility evidence.
    • Integration Planning: Defining auth boundaries and transport-independent business logic.

    The Output

    Expect high-density, structured design specs including endpoint summaries, auth expectations, and explicit error behaviors. For reviews, you receive a prioritized list of risks with actionable recommended fixes, ensuring your API remains stable and developer-friendly.

    How to install

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

    ~30 seconds
    1. 1

      Download the ZIP

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    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.

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    Recently published to Agensi

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    Security scanned

    Verified clean 6 months ago

    • Passed all security checks, Safe to install

    Listed6 months ago

    What's inside

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