Works with the AI tools you already use

    Claude CodeClaude CodeCursorCursorCodex CLICodex CLIMuseMuseDotsDots+22 more

    Repair Double Completion Races

    1

    Repair double completion, duplicate callbacks, timeout/cancel races, stale retry callbacks, duplicate response writes, and cleanup running twice.

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    Repair Double Completion Races

    Repair Double Completion Races

    Example session with this skill installed

    Our Node/TypeScript payment-status wrapper converts a callback SDK into a Promise. We start a timeout timer, register an AbortSignal listener, and call the SDK. If the timeout fires first we reject and release a semaphore permit, but the SDK callback can arrive later and release the permit again. In one path the callback also invokes an onComplete hook after the timeout. Repair locally with fake clocks and deterministic callback barriers. Do not call production, change payment semantics, or assume a timeout means the partner did not process the request.

    • Read your context and instructions
    • Compiled the repair double completion

    Double-completion race found. Timeout, abort, and SDK callback can all settle one operation and release the same semaphore. The repair centralizes terminal ownership, makes cleanup exactly-once locally, fences late callbacks, and preserves unknown external outcome after timeout.

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

    What you get

    Prevent 'headers already sent' errors in HTTP response handlers.Stop late retry attempts from completing newer operations via generation fencing.Ensure resource cleanup runs exactly once during socket close races.Convert flaky async tests into deterministic race condition validations.

    About this skill

    Async operations often have several ways to finish: callback, timeout, cancellation, socket close, retry completion, or response commit. Without one terminal owner, two paths can settle the same promise/future, invoke user callbacks twice, release resources twice, or let an old retry attempt complete newer work.

    Repair Double Completion Races maps every completion source, introduces a single terminal state transition and generation fencing, makes late completions observable and side-effect-free, and proves the repair with deterministic fake-clock/barrier tests.

    It does not alter business retry semantics or pretend timeout/cancellation proves an external operation did not happen.

    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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    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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    Security scanned

    Verified clean 1 month ago

    • Passed all security checks, Safe to install

    Listed1 month ago
    Updated1 month ago

    What's inside

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