How to force an LLM to use tools? DeepSeek V4 ignores search instructions

ihatebeinganonymous · reddit · 2026-08-24

The author developed a Telegram bot using DeepSeek V4 Flash but found the model often ignores system prompts to use tools for factual questions (e.g., France's World Cup qualification history), relying on internal weights instead. They seek a more mechanical way to enforce tool usage before answering to ensure verifiability. An anecdotal note suggests the new "Flash Vision Exp" variant may be more compliant with tool calling.

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