Ln 628 Concurrency Auditor

This is an L3 worker skill that audits your code for concurrency issues across seven categories: async races, thread safety, TOCTOU vulnerabilities, deadlocks, blocking I/O, resource contention, and cross-process races. It uses a two-layer approach where grep finds candidates and an agent reasons about context, then spits out a compliance score out of 10. You'd reach for this during code review or before production if you're dealing with multi-threaded systems or async-heavy applications. It's part of a larger audit framework (references core contracts and MCP integration patterns), so it expects to work within that ecosystem rather than as a standalone tool. The 316 installs and clean security audits suggest it's seeing real use in teams that need systematic concurrency review.