Agentic Legal AI Went GA in August 2026. Your Invoice Format Didn't: The Fee-Record Problem Firms Hit in Month Two

Thomson Reuters made the next generation of CoCounsel Legal generally available on August 20, 2026 — a fully agentic system that plans and executes multi-step legal work — and followed it four days later with a proprietary legal model. The deployment question firms answer in week one is which agent to run. The question that ambushes them in month two is what the invoice says when a six-hour task finishes in twenty minutes, and whether the firm's ledger can prove the cost, the reviewer, and the recovery.