MindControl steers llama.cpp reasoning by injecting prompts during sampling
hellajacked · reddit · 2026-07-23
A GitHub project called MindControl adds a way to steer the reasoning process of llama.cpp during sampling.
The author says smaller local models such as Qwen3.6-27B can get stuck in endless “But, wait” loops or produce bad reasoning, especially at low temperatures and with specific system prompts. The project addresses this by injecting short self-aware messages into the thought stream at key thresholds:
- when <think> starts, it nudges the model to stay concise,
- around 70% of the thinking budget, it reminds the model to converge,
- near the end of the budget, it forces a transition to the final answer.
The repo is public and includes a prebuilt Docker image for AMD64 + CUDA. The author says the technique appears noticeably effective and suggests it could evolve into a more general “reasoning grammar.”
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