Some agentic systems do apply RAG to skills, there's nothing about skills that requires blind insertion into prompts.

This is really an agentic harness issue, not an LLM issue per se.

In 2026, I think we'll see agentic harnesses much more tightly integrated with their respective LLMs. You're already starting to see this, e.g. with Google's "Interactions" API and how different LLMs expect CoT to be maintained.

There's a lot of alpha in co-optimizing your agentic harness with how the LLM is RL-trained on tool use and reasoning traces.