Concurrency & Idempotency Protection
Stop concurrency, retry, and idempotency failures before they create duplicate or overwritten state. This bundle covers duplicate writes, duplicate business actions, quota races, optimistic locking, stale form overwrites, unknown API outcomes, partial batch recovery, and rerunnable imports. Use it when simultaneous requests, retries, timeouts, or partial success can charge, create, update, or process the same work more than once.
Works with every agent that reads SKILL.md — Claude Code, Cursor, Codex CLI, Gemini CLI, GitHub Copilot, Windsurf, OpenClaw, and more.
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What's included
8 skills
Repair duplicate writes, oversold inventory, double charges, and other concurrency bugs in APIs.
Prevent duplicate payments, refunds, shipments, orders, approvals, notifications, account changes, and operational work.
Repair quota races that let concurrent requests exceed seats, projects, storage, credits, jobs, or other SaaS limits.
Repair optimistic-concurrency drift in a repository using Cursor.
Repair stale forms, autosaves, and API clients that silently overwrite newer changes made by another user or process.
Repair API calls that time out after possibly succeeding, leaving payments, orders, or provisioning in an unknown state.
Repair bulk APIs, imports, and workers where one failed item hides successful work or triggers unsafe full retries.
Repair fragile CSV, JSON, API, and database import scripts so they can be rerun safely.
See it in action
Stop Duplicate Writes Under Load
Example session with this skill installed
I'm seeing duplicate records in the orders table when users double-click the checkout button. Can you fix the race condition in checkout_controller.rb?
- Read your context and instructions
- Compiled the stop duplicate writes
Race Condition Found: Check-Then-Insert on orders table.
Invariant at risk: One order per checkout session.
Repair Applied: Added unique index on (session_id) and database-level transaction.
Validation Result: Simulated 10 concurrent requests; 1 succeeded, 9 safely rejected with 409 Conflict.
How to install
Works the same in every agent - Claude, Cursor, Codex, Copilot and 20+ more.
- 1
Download the ZIP
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- 2
Unzip into your skills folder
Every agent reads skills from one folder on your machine. Drop the unzipped folder in there.
- 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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Click the path to copy it. Create the folder if it does not exist yet.
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