Trelx

Trelx is a closed-loop evaluation engine for Ultravox voice agents. It automatically ingests live production calls via the Ultravox API, analyzes transcripts using GPT-4o, maps failures to a strict taxonomy, and isolates the exact transcript quote where the agent failed. But it doesn't stop at reporting, Trelx acts as an automated prompt engineer, generating safer prompt patches and allowing teams to push those fixes back to Ultravox instantly. It is built for high-volume workflows where catching a prompt hallucination early saves hundreds of future calls.