Ubicloud Measures 92% Tool-Call Schema Accuracy for Kimi K2.6 on vLLM 0.28

Ubicloud reported that serving Kimi K2.6 with vLLM 0.28 produced the expected tool-call schema 92% of the time, meaning 2 of every 25 attempted tool calls failed. The findings appear in a blog post published October 26, 2026. In agent loops, a non-conforming call cannot be dispatched cleanly, so orchestration layers must retry or abandon the step.