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    Cart Merge Contract Repair

    1

    Repair guest-to-account cart merge bugs including duplicate lines, stale prices, coupon leakage, replay races, and checkout state drift.

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    Cart Merge Contract Repair

    Cart Merge Contract Repair

    Example session with this skill installed

    Our Next.js storefront merges guest carts into account carts after login. Identical SKUs sometimes duplicate, personalized lines can collapse together, guest coupons survive when the account is ineligible, prices are copied without revalidation, and repeated auth callbacks can run the merge twice. Repair the repository locally and add regression tests without accessing production carts or payment systems.

    • Read your context and instructions
    • Compiled the cart merge contract

    Repair decision
    CROSS-LAYER CART-MERGE CONTRACT DRIFT FOUND — SAFE LOCAL PATCH AVAILABLE.

    Findings

    • Unstable line identity can create duplicate or collapsed items.
    • Personalized lines are not consistently distinguished.
    • Guest promotions can survive without account revalidation.
    • Guest price snapshots can become stale after login.
    • Repeated authentication callbacks can replay the same merge.
    • Checkout can read a cart version created before recalculation.

    Repair

    • Added canonical line identity.
    • Added stable merge operation IDs and source/target version guards.
    • Separated active and saved-item state.
    • Added post-merge pricing, promotion, quantity, and availability validation.
    • Added checkout version protection.
    • Added deterministic replay and collision tests.

    Production carts, live pricing, promotions, inventory, and payment systems were not accessed.

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

    About this skill

    Guest-to-account cart merges can silently corrupt state: duplicate lines, collapsed personalization, stale prices, invalid coupons, quantity-limit bypasses, saved-item leakage, repeated merges, and checkout totals based on an obsolete cart version.

    Cart Merge Contract Repair gives an AI coding agent a structured workflow for tracing and repairing these failures inside an existing repository.

    It analyzes cart ownership, deterministic line identity, variants, modifiers, personalization, bundles, quantities, saved items, pricing, promotions, inventory boundaries, currency and shipping context, authentication callbacks, merge tokens, retries, recalculation, and checkout handoff.

    The skill helps implement bounded fixes such as canonical line fingerprints, stable merge operation IDs, source/target version guards, idempotent retries, post-merge validation, truthful lifecycle states, and deterministic regression tests.

    It deliberately separates structural cart merging from business-policy decisions. It will not invent coupon precedence, pricing policy, inventory rules, bundle equivalence, or customer-facing behavior where the repository does not establish them.

    Ideal for ecommerce, marketplaces, ordering systems, subscription platforms, retail applications, and other products that merge anonymous carts into authenticated accounts.

    Find more skills like this on the Claude Skills Marketplace, the Codex Skills Marketplace and the Gemini Skills Marketplace, or browse Claude Skills for E-commerce.

    Requires local repository files and representative test fixtures. Does not access production carts, customer data, Stripe or other payment APIs, live pricing, promotion or inventory services, or production databases. Business-policy decisions such as coupon precedence, pricing behavior, bundle equivalence, and quantity rules require human approval. Production behavior remains unverified until separately tested.

    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

    Requires read/write access to the user-opened repository to inspect and repair cart models, merge services, authentication callbacks, pricing and promotion adapters, checkout integration, tests, fixtures, and documentation. Terminal access is used only for repository-supported local tests, type checks, linting, and builds. No live customer carts, payment systems, production databases, external network services, or environment secrets are required.

    Listed3 months ago
    Updated8 days ago

    What's inside

    Frequently Asked Questions

    This skill provides a structured diagnostic and repair framework that helps AI agents identify and fix complex state corruption issues, such as duplicate line items and pricing drifts, that occur when a guest user logs in.

    The skill is designed to work with any major AI coding agent or LLM-based development tool that has access to your repository's codebase and a standard terminal environment.

    You receive a specialized workflow configuration including analysis patterns for cart ownership, deterministic line identity templates, and a suite of deterministic regression test structures.

    Setup involves importing the skill's workflow into your AI agent's environment and providing it with the entry points for your application's authentication and cart management modules.

    No, the skill is designed to respect your existing business logic; it focuses on the structural integrity of the merge process without overriding your specific pricing, coupon, or inventory policies.

    Yes, your purchase includes access to future updates, including new diagnostic patterns for emerging ecommerce frameworks and refined regression testing strategies.

    New in E-commerce