api error message architect

    1

    Turn cryptic API errors into actionable developer experiences with RFC-mapped status codes and consistent schemas.

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    Works with the AI tools you already use

    Claude CodeClaude CodeCursorCursorCodex CLICodex CLIMuseMuseDotsDots+22 more

    api error message architect

    Example session with this skill installed

    I have a POST /orders endpoint that fails if the user has an unpaid balance or if the item is out of stock. Design the error responses and a consistent JSON schema.

    • Read your context and instructions
    • Compiled the api error message

    I have designed the error responses for the /orders endpoint, mapping them to RFC 9110 standards and defining a standardized JSON envelope.

    API Error Design: POST /orders

    Error CaseHTTP StatusError IDMessage CopyAction/Retry Guidance
    Unpaid Balance402 Payment Requiredaccount_balance_overdueYour account has an outstanding balance of $45.00.Please settle your balance at /account/billing before placing new orders.
    Out of Stock409 Conflictinventory_insufficientThe requested item 'SKU-123' is currently out of stock.Remove the item or check back later. Do not retry automatically.
    Validation422 Unprocessable Contentorder_validation_failedThe 'quantity' field must be a positive integer.Update the quantity to 1 or more and resubmit.

    Error Response Schema

    {
  "error": {
    "code": "account_balance_overdue",
    "message": "Your account has an outstanding balance of $45.00.",
    "details": {
      "balance_due": 4500,
      "currency": "USD"
    },
    "doc_url": "https://api.example.com/docs/errors/account_balance_overdue",
    "request_id": "req_88291aff2"
  }
}

    Rationale & Assumptions

    402 Payment Required: Chosen per RFC 9110 for cases where the request is valid but payment is required to proceed.
    *

    409 Conflict: Used instead of 404 because the resource exists but the state (stock level) conflicts with the request.
    *

    Assumption: I am assuming your client libraries can parse a nested error object.

    TO VERIFY: Check if your SDK generators require a flat response structure.

    Next steps

    1. Implement the account_balance_overdue check in your payment middleware.
    2. Update the API Gateway to pass through the 409 Conflict status code without overriding it.
    3. Add the new doc_url endpoints to your developer portal.

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

    What you get

    Map failure cases to RFC 9110 compliant HTTP status codes.Write developer-friendly error messages that reduce support tickets.Create standardized JSON error envelopes for platform consistency.Define CLI exit codes and stderr formatting for internal tools.

    About this skill

    The problem

    Vague API errors like "Something went wrong" frustrate developers and increase support tickets. Cryptic error messages at 2am make debugging impossible and slow down integration times.

    What it does

    • Maps every error case to precise RFC 9110 HTTP status codes with technical rationales.
    • Drafts actionable message copy that explains exactly what went wrong and how the developer can fix it.
    • Designs consistent JSON error envelopes including stable error IDs, request tracking, and documentation links.
    • Standardizes CLI exit codes and stderr formatting for human and machine readability.

    Why this beats prompting it yourself

    General LLMs often assign status codes based on "vibes" rather than RFC standards. This skill enforces a strict separation of facts, assumptions, and actions, ensuring your error catalog is technically accurate and backwards-compatible.

    Use cases

    • Generating a comprehensive error code catalog for a new microservice.
    • Refactoring cryptic "400 Bad Request" messages into specific, actionable validation errors.
    • Designing standardized JSON error schemas for a platform-wide API migration.
    • Defining CLI exit codes and stderr behavior for a developer tool.

    How to install

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

    ~30 seconds
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      Download the ZIP

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      Unzip into your skills folder

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      Ask your agent to use it

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    Recently published to Agensi

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    Security scanned

    Verified clean 18 days ago

    • Passed all security checks, Safe to install

    Listed18 days ago

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