You can't prompt your way out of prompt injection.
It's an architecture problem, not a wording problem: A developer argues that prompt injection cannot be solved by hardening system prompts because LLMs lack a separate code-vs-data channel like SQL prepared statements. System prompts, user content, RAG chunks, and tool outputs share one stream, so wording fixes fail. The post calls for architectural defenses.
Source Brief
You can't prompt your way out of prompt injection. It's an architecture problem, not a wording problem: A developer argues that prompt injection cannot be solved by hardening system prompts because LLMs lack a separate code-vs-data channel like SQL prepared statements. System prompts, user content, RAG chunks, and tool outputs share one stream, so wording fixes fail. The post calls for architectural defenses.