diff --git a/scripts/frank-medium.env b/scripts/frank-medium.env
index 0d57c31..fbc64c5 100644
--- a/scripts/frank-medium.env
+++ b/scripts/frank-medium.env
@@ -129,7 +129,10 @@ THREAD_BATCH=8
 # f16 K/V: an agentic checkpoint is the wrong place to spend KV precision.
 CACHE_TYPE_K=f16
 CACHE_TYPE_V=f16
-CTX_CHECKPOINTS=8
+# Context checkpoints: 0 is the build's default -- no per-slot KV snapshots, so
+# a re-sent or rewound conversation re-prefills instead of rewinding.  Stated
+# explicitly so the tunable stays visible rather than merely absent.
+CTX_CHECKPOINTS=0
 CACHE_RAM=8192
 
 # Sampling defaults for requests that send none -- the values the vLLM