Xiangchen Song

In real healthcare operations, agents must do far more than answer medical questions. They need to read charts, interpret clinical and operational policies, verify coverage, route referrals, draft P2P scripts, and finalize care plans — where a single policy violation can mean a denied claim or missed patient outcome. @actAVAai @iscreamnearby led and developed CHI-Bench (Clinical Healthcare In-situ Benchmark), the first long-horizon, policy-rich benchmark for AI agents operating across end-to-end U.S. healthcare workflows. Key highlights: ▶️ High-fidelity simulators for Provider Prior Authorization, Payer Utilization Management, and Population Health Care Management, all exposed as MCP servers over patient, clinician, and insurer records. 🧪 Each trial runs 60–80 agent steps across 4–6 clinical stages, with access to 21 healthcare apps, 200+ MCP tools, and a 1,279-document operations handbook. Leaderboard results across 30 frontier agents: • Claude Code + Opus 4.6: 28% pass@1 • Codex + GPT-5.5: 21% • Utilization review: 41% • Care management: 32% • Prior authorization: 29% Reliability remains a major challenge: no agent exceeds 20% when the same case is repeated three times.

We present 🧩Retroformer🧩, iteratively improving LLM agents by learning a plug-in retrospective model, that through the process of policy gradient optimization, automatically refines the prompts with env-specific rewards. arXiv: arxiv.org/abs/2308.02151 #LanguageAgents #LLM