new file mode 100644
index 0000000..9d74159
@@ -0,0 +1,37 @@
+---
+title: Model Skill Files (World Diff)
+visibility: public
+status: idea
+date: 2026-02-09
+---
+
+# Model Skill Files (World Diff)
+
+Model Skill Files is a concept for a publicly curated "world diff" that AI models can consume to stay current beyond their training cutoff. Rather than relying solely on ever-larger models, this approach gives any model access to structured world-state updates: what new products exist, which APIs have changed, what has been deprecated.
+
+## The Gap
+
+No one currently maintains a community-curated, model-consumable knowledge update covering new products, API changes, naming updates, deprecations, and version bumps since a model's training cutoff. This is an open-source project opportunity.
+
+## Existing Partial Solutions
+
+- **Agent Skills (open standard):** Anthropic created the SKILL.md pattern, adopted by Microsoft, OpenAI, and Cursor. These are task-specific skills, not world-state updates.
+- **llm-stats.com:** Tracks model releases and updates but not in a model-consumable format.
+- **CCI (Claude Collective Intelligence):** Captures problem/solution pairs discovered during Claude Code sessions — a narrow version of the concept.
+- **CLAUDE.md / system prompts:** An ad hoc version of the idea, where developers manually note stale information in their system prompts.
+
+## Vision
+
+A canonical, versioned, machine-readable file that any model can be given as context, enabling it to reason accurately about the current state of the world without retraining. This connects to [[context-engineering-prize|The Context Engineering Prize]] — context engineering is not just about prompting technique but also about the quality and currency of the knowledge provided.
+
+## Status
+
+**Idea stage.** Identified as a potential open-source project.
+
+## Related Ideas
+
+- [[context-engineering-prize|The Context Engineering Prize]]
+
+---
+
+*Source: Voice note, February 9 2026*
\ No newline at end of file