James' Growth Diary

Jun 25, 2026 · Artificial Intelligence

Why Compression Isn’t Truncation: Hermes’s Structured Summaries Keep Prefix Cache Hits

The article explains how Hermes Agent avoids the pitfalls of naive sliding‑window truncation—such as orphaned tool calls and broken KV‑cache—by using a three‑segment protection scheme, cheap tool‑result pre‑pruning, and a structured, reference‑only summary that dramatically reduces tokens while preserving and even improving prefix cache hit rates.