# Catalogue

> Public catalogue components.

JSON: https://staging.leyline.ahensya.com/api/v1/components

- [PageIndex](https://staging.leyline.ahensya.com/components/pageindex.md): PageIndex (MIT, Python) is VectifyAI’s vectorless, reasoning-based RAG engine. First-party pitch: build a hierarchical tree index per document, then let an LLM reason through that tree (human-like section navigation) instead of embedding chunks into a vector database.
- [Fix Cold Start Latency in AI Sandboxes: Techniques](https://staging.leyline.ahensya.com/components/fix-cold-start-latency-in-ai-sandboxes-techniques.md): # How to fix cold start latency in AI sandboxes: techniques and tradeoffs