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    Claude CodeClaude CodeCursorCursorCodex CLICodex CLIMuseMuseOpenClawOpenClaw+21 more

    API Error Message Designer

    1

    The problem Vague API errors like "Something went wrong" frustrate developers and spike support tickets.

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    API Error Message Designer

    API Error Message Designer

    Example session with this skill installed

    Create API error messages for a payment gateway when a card is expired, a request is missing a currency field, and when the user hits a rate limit.

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

    Processed error messages for Payment Gateway V1.

    API Error Message Design: Payment Gateway

    Error codeHTTP statusCategoryDeveloper-facing messageNext stepRetry guidance
    PAYMENT_CARD_EXPIRED400ValidationThe payment method provided has expired.Ask the customer to update their card details or provide a new payment method.Do not retry with the same card data.
    VAL_MISSING_CURRENCY400ValidationThe 'currency' field is required but was not found in the request body.Add a valid ISO 4217 currency code (e.g., 'USD') to the request payload.Correct the payload and retry.
    RATE_LIMIT_EXCEEDED429Rate limitToo many requests have been sent in a short period.Implement exponential backoff or reduce request frequency.Retry after the window specified in the Retry-After header.

    Example Response Payload Wording

    {
  "error": {
    "code": "VAL_MISSING_CURRENCY",
    "message": "The 'currency' field is required but was not found in the request body.",
    "request_id": "req_12345abcde",
    "docs_url": "https://docs.example.com/errors#VAL_MISSING_CURRENCY"
  }
}

    Next steps

    1. Confirm the specific Retry-After header logic with the infrastructure team.
    2. Verify that request_id is properly mapped in the gateway middleware.
    3. Update the API Reference 'Common Errors' section with these snippets.

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

    What you get

    Standardize error wording across microservicesGenerate documentation-ready troubleshooting guidesAudit API responses for security leaks and vague wordingCreate consistent error taxonomies for new integrations

    About this skill

    The problem

    Vague API errors like "Something went wrong" frustrate developers and spike support tickets. Raw logs often leak sensitive stack traces or provide no actionable path for the user to fix their request.

    What it does

    • Generates developer-friendly error taxonomies for authentication, validation, and rate-limiting events.
    • Produces structured error tables including HTTP status codes, human-readable explanations, and retry logic.
    • Creates documentation snippets and example JSON response payloads using safe placeholders.
    • Audits existing error sets to provide clarity scores and security risk assessments.

    Why this beats prompting it yourself

    This tool enforces a strict security-first framework that prevents the accidental exposure of secrets or internal paths. It follows a consistent multi-step workflow to ensure every message includes a clear "next step" rather than just a failure notification.

    Use cases

    • Writing error message style guides for new SaaS platforms.
    • Converting technical backend logs into support-safe developer documentation.
    • Auditing legacy API error codes for consistency and actionability.
    • Building troubleshooting guides for common integration edge cases.

    Known limitations

    Does not debug live production systems or inspect real-time logs. Requires manual engineering review to ensure technical accuracy of suggested retry windows and status codes.

    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

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    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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    Fresh listing

    Recently published to Agensi

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    Trust & safety

    Security scanned

    Verified clean 23 days ago

    • Passed all security checks, Safe to install

    Listed23 days ago

    What's inside

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