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Add agentic vectorless RAG example to README highlights

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<details open>
<summary><h3>📢 Latest Updates</h3></summary>
<summary><h2>🔥 Updates</h2></summary>
**🔥 Releases:**
- [**PageIndex Chat**](https://chat.pageindex.ai): The first human-like document-analysis agent [platform](https://chat.pageindex.ai) built for professional long documents. Can also be integrated via [MCP](https://pageindex.ai/mcp) or [API](https://docs.pageindex.ai/quickstart) (beta).
<!-- - [**PageIndex Chat API**](https://docs.pageindex.ai/quickstart): An API that brings PageIndex's advanced long-document intelligence directly into your applications and workflows. -->
<!-- - [PageIndex MCP](https://pageindex.ai/mcp): Bring PageIndex into Claude, Cursor, or any MCP-enabled agent. Chat with long PDFs in a reasoning-based, human-like way. -->
**📝 Articles:**
- [**PageIndex Framework**](https://pageindex.ai/blog/pageindex-intro): Introduces the PageIndex framework — an *agentic, in-context* *tree index* that enables LLMs to perform *reasoning-based*, *human-like retrieval* over long documents, without vector DB or chunking.
<!-- - [Do We Still Need OCR?](https://pageindex.ai/blog/do-we-need-ocr): Explores how vision-based, reasoning-native RAG challenges the traditional OCR pipeline, and why the future of document AI might be *vectorless* and *vision-based*. -->
- [**Agentic Vectorless RAG Example**](https://github.com/VectifyAI/PageIndex/blob/main/examples/openai_agents_demo.py): A complete *agentic, vectorless RAG* [example](https://github.com/VectifyAI/PageIndex/blob/main/examples/openai_agents_demo.py) with self-hosted PageIndex, using OpenAI Agents SDK.
- [PageIndex Chat](https://chat.pageindex.ai): Human-like document-analysis agent [platform](https://chat.pageindex.ai) for professional long documents. Also available via [MCP](https://pageindex.ai/mcp) or [API](https://docs.pageindex.ai/quickstart).
- [PageIndex Framework](https://pageindex.ai/blog/pageindex-intro): The PageIndex framework — an *agentic, in-context tree index* that enables LLMs to perform *reasoning-based, human-like retrieval* over long documents.
**🧪 Cookbooks:**
<!-- **🧪 Cookbooks:**
- [Vectorless RAG](https://docs.pageindex.ai/cookbook/vectorless-rag-pageindex): A minimal, hands-on example of reasoning-based RAG using PageIndex. No vectors, no chunking, and human-like retrieval.
- [Vision-based Vectorless RAG](https://docs.pageindex.ai/cookbook/vision-rag-pageindex): OCR-free, vision-only RAG with PageIndex's reasoning-native retrieval workflow that works directly over PDF page images.
- [Vision-based Vectorless RAG](https://docs.pageindex.ai/cookbook/vision-rag-pageindex): OCR-free, vision-only RAG with PageIndex's reasoning-native retrieval workflow that works directly over PDF page images. -->
</details>
---
@ -85,10 +81,15 @@ The PageIndex service is available as a ChatGPT-style [chat platform](https://ch
### 🧪 Quick Hands-on
- Try the [**Vectorless RAG**](https://github.com/VectifyAI/PageIndex/blob/main/cookbook/pageindex_RAG_simple.ipynb) notebook — a *minimal*, hands-on example of reasoning-based RAG using PageIndex.
- Experiment with [*Vision-based Vectorless RAG*](https://github.com/VectifyAI/PageIndex/blob/main/cookbook/vision_RAG_pageindex.ipynb) — no OCR; a minimal, reasoning-native RAG pipeline that works directly over page images.
- 🔥 [**Agentic Vectorless RAG**](examples/openai_agents_demo.py) (**latest**) — a complete **agentic vectorless RAG** [example](https://github.com/VectifyAI/PageIndex/blob/main/examples/openai_agents_demo.py) with *self-hosted* PageIndex, using OpenAI Agents SDK.
- Try the [Vectorless RAG](https://github.com/VectifyAI/PageIndex/blob/main/cookbook/pageindex_RAG_simple.ipynb) notebook — a *minimal*, hands-on example of reasoning-based RAG using PageIndex.
- Check out [Vision-based Vectorless RAG](https://github.com/VectifyAI/PageIndex/blob/main/cookbook/vision_RAG_pageindex.ipynb) — no OCR; a minimal, vision-based & reasoning-native RAG pipeline that works directly over page images.
<div align="center">
<a href="https://github.com/VectifyAI/PageIndex/blob/main/examples/openai_agents_demo.py" target="_blank" rel="noopener">
<img src="https://img.shields.io/badge/View_on_GitHub-Agentic_Vectorless_RAG-blue?style=for-the-badge&logo=github" alt="View on GitHub: Agentic Vectorless RAG" />
</a>
<br/>
<a href="https://colab.research.google.com/github/VectifyAI/PageIndex/blob/main/cookbook/pageindex_RAG_simple.ipynb" target="_blank" rel="noopener">
<img src="https://img.shields.io/badge/Open_In_Colab-Vectorless_RAG-orange?style=for-the-badge&logo=googlecolab" alt="Open in Colab: Vectorless RAG" />
</a>
@ -194,7 +195,7 @@ python3 run_pageindex.py --md_path /path/to/your/document.md
### A Complete Agentic RAG Example
For a complete example on **agentic RAG with PageIndex** (using [OpenAI Agents SDK](https://github.com/openai/openai-agents-python)), see [`examples/openai_agents_demo.py`](examples/openai_agents_demo.py).
For a complete example on building document QA agents via **agentic vectorless RAG** using PageIndex (with [OpenAI Agents SDK](https://github.com/openai/openai-agents-python)), see [`examples/openai_agents_demo.py`](examples/openai_agents_demo.py).
```bash
# Install optional dependency
@ -204,8 +205,6 @@ pip3 install openai-agents
python3 examples/openai_agents_demo.py
```
---
<!--
# ☁️ Improved Tree Generation with PageIndex OCR