Microsoft's AutoTailor compresses agent trajectories into 33 APIs, hitting 90.6% on WebArena
dair_ai · x · 2026-09-22
Microsoft Research's AutoTailor paper auto-generates MCP browser-automation tools from agent trajectories. Web trajectories become parameterized APIs, then a quality filter (wrong granularity/duplicates) and a usage filter cut 1,283 candidates to 87; online monitoring adds APIs for recurring gaps and prunes unused ones, converging at 33. On 106 WebArena Postmill tasks, 33 APIs plus a ReAct fallback reach 90.6% correctness vs 87.5% for ReAct alone, with request tokens down 57.8% and latency down 29.4%. Without the fallback, accuracy matches the unfiltered set using 94.9% fewer request tokens.
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