One fixed, fully sanitized ~240k-token agentic conversation that makes DeepSeek-V4-Flash-0731 collapse into repeating a short action-announcement ("Run.") instead of emitting a tool call. Reproduced 2026-08-14 on three serving stacks that share no code or hardware:
| Serving stack | Trials | Strict loops | Notes |
|---|---|---|---|
| Ollama cloud, deepseek-v4-flash:0731-cloud | 6 | 6/6 | 61-97x "Run.", all rolls hit the 2,048-token cap |
| From df753b5dd5912db8cdb50044f3b2985b942763a2 Mon Sep 17 00:00:00 2001 | |
| From: Richard A Steenbergen <ras@petabitscale.com> | |
| Date: Wed, 12 Aug 2026 16:17:44 -0700 | |
| Subject: [PATCH 1/6] parser: do not consume DSML markup a request can never | |
| turn into a tool call | |
| A request that declares no tools still entered tool parsing: only | |
| tool_choice="none" *with* tools set suppress_tool_calls, so | |
| (CONTENT, "TOOL_START") fired, the machine entered TOOL_PREAMBLE -- which | |
| has no content_events entry -- and every later chunk was discarded. With no |