Reflex

Reflex is a self-improvement loop for agent harnesses. It watches real Antigravity execution traces, sends the trace plus the harness’s current skill files to a Google Managed Agent, and runs a recursive language-model reflection loop with Gemini 3.5 Flash to figure out what went wrong. The reflector can then edit an existing skill or author a new one, turning failed runs into better operating procedures for the next run. In our demo, Antigravity follows a stale skill, hits missing scripts/files/endpoints, and Reflex automatically patches the harness skills so the next agent discovers the correct project command and validates successfully.