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junnv93
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verify-cas

Detect and enforce CAS optimistic locking compliance across backend services and frontend mutations.

Updated Aug 27, 2026
Search Tags:#testing#versioning#frontend#backend#optimistic-locking#cas
One-click install
npx skills add https://github.com/junnv93/equipment_management_system --skill verify-cas
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: verify-cas
Source: https://github.com/junnv93/equipment_management_system/tree/main/.claude/skills/verify-cas
Command: npx skills add https://github.com/junnv93/equipment_management_system --skill verify-cas

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

CAS pattern violations in state-changing backend logic can lead to race conditions, stale data, and inconsistent behavior across frontend mutations.

Core Features & Use Cases

  • Enforces VersionedBaseService inheritance to ensure a single source of truth for versioned state changes.
  • Verifies versionedSchema presence in state-change DTOs to guarantee proper CAS checks.
  • Promotes updateWithVersion usage over raw updates to enable optimistic locking.
  • Checks cache invalidation on 409 conflicts to prevent stale UI data.
  • Ensures frontend mutations include version parameters to align client state with server state.

Quick Start

Run this skill after introducing or updating state-changing endpoints to verify CAS usage across the backend and frontend.

Frequently Asked Questions about verify-cas

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I enforce optimistic locking compliance across backend services and frontend mutations?▼

Optimistic locking compliance is enforced by validating VersionedBaseService inheritance, updateWithVersion usage, and versionedSchema in DTOs across state-changing endpoints. It also checks frontend version propagation and cache invalidation on 409 conflicts.

How does the CAS pattern prevent race conditions in state-changing endpoints?▼

The CAS pattern prevents race conditions by requiring client-provided version parameters in mutations and applying updateWithVersion for database operations. If the server version mismatches, the transaction fails, preventing stale data overwrites.

How do I handle cache invalidation when an optimistic locking conflict occurs?▼

Handle optimistic locking conflicts by implementing the onVersionConflict hook to trigger cache invalidation. This purges stale UI data when a 409 conflict occurs, aligning the client state with the updated server state.

Does my DTO need a versionedSchema for optimistic locking to work?▼

Yes, your DTO requires a versionedSchema for optimistic locking. Verifying its presence guarantees that proper CAS checks are applied to state-change data transfer objects before processing mutations.

When should I run a CAS pattern compliance check on my API?▼

Run a CAS pattern compliance check after introducing or updating state-changing endpoints, or when adding new modules. This validates transaction-scoped CAS, version handling, and frontend version propagation before deploying changes.

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