# Doublecheck > Thorough review and verification of all code changes. Use when the user says /doublecheck, 'double check', 'review your work', 'verify changes', or asks to make sure nothing was missed after a set of code changes. Traces through all modifications, validates correctness, checks for bugs, and builds the solution. Use when this capability is needed. - Skill: `tomevault-io/doublecheck` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/doublecheck` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/doublecheck/raw - Safety review: pending (external: skill-scanner PASS, skillspector PASS) - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Coding & Dev Tools - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/doublecheck --- # Double Check Thoroughly review and verify all code changes made in this session. ## Process 1. **Trace through every change**: Re-read each modified file. Walk through the logic path from entry point to exit for every change. Confirm each change matches the original request. 2. **Verify completeness**: Compare what was requested against what was implemented. Flag anything missing or incomplete. 3. **Check for bugs and issues**: - Thread safety problems (shared mutable state, race conditions) - Memory leaks (undisposed resources, event handler leaks, missing `using` statements) - Async issues (missing `await`, deadlocks, fire-and-forget without error handling) - Performance issues (N+1 queries, unnecessary allocations, blocking calls in async paths) - Null reference risks - Off-by-one errors - Error handling gaps 4. **Check for linter errors and warnings**: Review code style, unused imports, unused variables, naming conventions, and any compiler warnings. Fix any found issues whether pre-existing or newly introduced. 5. **Build the solution**: Run the build once all changes are finalized. Fix any errors or warnings that appear. --- > Source: [YodasMyDad/ZauberCMS](https://github.com/YodasMyDad/ZauberCMS) — distributed by [TomeVault](https://tomevault.io).