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    Repair API Version Negotiation Bugs

    1

    Repair API-version negotiation bugs where headers, media types, paths, defaults, caches, or proxy rewrites select different contracts across clients and servers.

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    Repair API Version Negotiation Bugs

    Repair API Version Negotiation Bugs

    Example session with this skill installed

    Our gateway honors an Accept media-type version, while the app defaults from an X-API-Version header and falls back differently when both are present. Repair the negotiation without dropping any currently supported version.

    • Read your context and instructions
    • Compiled the repair api version

    Version authority is split across layers. The repair defines one precedence/validation contract, normalizes the selected version before routing, forwards one canonical representation, keys caches on the effective version, and tests conflicting/missing/unsupported inputs across every supported version.

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

    About this skill

    The problem

    API versioning often breaks when header parsing, routing logic, and state management disagree across service boundaries. These inconsistencies lead to leaking internal errors, cache poisoning via incorrect Vary headers, or broken backward compatibility for legacy clients.

    What it does

    • Identifies mismatches between path, header, and media-type versioning sources.
    • Aligns version negotiation across identity, validation, and state ownership layers.
    • Corrects cache policy and Vary key headers to prevent version collisions.
    • Implements version-aware request routing and schema dispatch logic.
    • Generates deterministic local fixtures and regression tests for version boundaries.

    Frameworks & tools

    Works with any backend stack using Read, Edit, and Bash tools. Applicable to REST, GraphQL, and gRPC gateways, as well as proxy configurations like Nginx or Envoy.

    Why this beats prompting it yourself

    Manual prompts often miss the edge cases of versioned state ownership and cleanup. This skill enforces a canonical contract for identity and validation before irreversible mutations occur, ensuring deprecation policies are actually respected in code, not just docs.

    Use cases

    • Fixing inconsistent version detection between a proxy and an application server.
    • Correcting state leakage where a v2 request mutates state owned by a v1 handler.
    • Resolving cache poisoning caused by missing version metadata in cache keys.
    • Standardizing 406 Not Acceptable or 415 Unsupported Media Type responses.

    Find more skills like this on the Claude Skills Marketplace, the Codex Skills Marketplace and the Gemini Skills Marketplace, or browse Claude Skills for APIs & Backend.

    Cannot redesign supported versions, compatibility policy, deprecation policy, routing, cache policy, authorization, and public errors; cannot verify production infrastructure or prove every runtime, proxy, network, storage, clock, or scheduler ordering.

    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 buying a skill.

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    Permissions

    Terminal / Shell
    Read Files
    Write Files

    Run on a clean branch with repository files and disposable local fixtures. Review patches and validation before merge. Keep production services, real credentials, customer payloads, and deployment out of scope.

    Listed2 months ago
    Updated9 days ago

    What's inside

    Frequently Asked Questions

    This skill analyzes your entire request flow—from proxy rewrites to application routing—to identify and fix logic gaps where different layers (headers vs. paths) disagree on which API contract to use.

    It is designed for any AI agent with filesystem and shell access, such as those built on the AutoGPT or OpenDevin frameworks, using standard Read, Edit, and Bash tools.

    Yes, the skill is equipped to resolve inconsistencies in proxy configurations like Nginx or Envoy, ensuring that version headers are correctly preserved or rewritten before reaching your backend.

    The skill provides the logic to identify version mismatches, the code fixes to align negotiation layers, and a set of regression tests to ensure backward compatibility remains intact.

    Absolutely. It is specifically designed to handle media-type negotiation and custom headers, ensuring your server correctly responds with 406 or 415 errors when a client requests an unsupported contract.

    Beyond simple routing, this skill audits how state is mutated to prevent 'version leakage,' where a newer API version incorrectly modifies data structures intended for legacy clients.

    New in APIs & Backend