Api Designer

    6

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

    $5

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    Claude CodeClaude CodeCursorCursorCodex CLICodex CLIMuseMuseDotsDots+21 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

    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'.

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

    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.

    • Does not generate executable SDK code or server boilerplate.
    • Best suited for design-time planning, not real-time traffic monitoring.
    • Requires user-provided business context for optimal modeling.

    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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    Listed7 months ago

    What's inside

    Frequently Asked Questions

    This skill specializes in resource modeling, contract-first design, and architecture audits across REST, GraphQL, and event-driven patterns, ensuring your APIs are scalable and follow industry standards.

    The skill is designed to work with most major LLMs and agentic platforms; simply import the skill files into your preferred AI agent environment to begin the design process.

    You will receive the core skill configuration, a suite of structured design templates, and a set of standardized review protocols for auditing existing endpoints.

    Yes, the skill automates checks for backward compatibility and can provide a prioritized list of risks and required fixes for any proposed changes to your existing endpoints.

    Once purchased, you will have access to any future refinements and updates to the skill's logic, ensuring your API designs stay current with evolving industry best practices.

    Connect your AI agent to Agensi through MCP, then ask it to use api-designer on your task. Your agent loads the latest approved version each time. Paid skills require a purchase or active subscription. Skill files are not available for download; your licence does not allow you to save, copy or export any part of a skill.

    New in APIs & Backend