Greptile, an AI code review platform, unveiled TREX—a code reviewer that doesn't just read your pull requests, it actually runs them. Traditional static analysis catches bugs visible in code, but misses runtime failures: logic errors requiring specific state, UI regressions after page load, race conditions that need live requests. TREX spins up isolated sandboxed environments for each review, executes the changed code with real dependencies, and reports findings backed by screenshots, logs, API traces, and video artifacts. The system uses agent orchestration—a main reviewer identifies risky areas, then spawns parallel subagents to investigate each one, all sharing context. It's model-agnostic, meaning Greptile can swap between the best frontier models without rebuilding. The team's vision: move beyond code review toward continuous validation—running tests on every PR. According to Greptile's analysis, most code review tools still rely on static inspection. TREX challenges that paradigm entirely.

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