TREX: An AI code reviewer that runs your code

Greptile has developed TREX, an AI code reviewer that goes beyond static analysis by actually executing code to catch runtime bugs that traditional code review misses, such as logic errors, UI regressions, and race conditions. The tool uses an orchestrator agent that identifies issues and spins up dedicated sub-agents to investigate specific problems in parallel, each inheriting context from the main reviewer rather than starting from scratch. This architecture solves the problem of wasted compute and context management that occurred when agents operated independently.