CLAUDE.md is static same content every session (and a soft 40k character limit)

This is dynamic attention routing. Files get scored based on what you're actively discussing. mention "auth" and auth-related docs go HOT (full injection), related files go WARM (headers only), unrelated files stay COLD (evicted).

Scores decay over turns. If you stop talking about auth, those files fade back to COLD automatically.

Plus multi-instance coordination, concurrent Claude sessions sharing completions and blockers so they don't duplicate work.

25k character limit on injection, so you compact less and stay focused where its needed. Ive also seen it help alot with the post compacting context wobble that occurs.