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examples/tutorials/doc-search/description.md

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+## Document Search by Description
+
+For documents that don't have metadata, you can use LLM-generated descriptions to help with document selection. This is a lightweight approach that works best with a small number of documents.
+
+
+### Example Pipeline
+
+
+#### PageIndex Tree Generation
+Upload all documents into PageIndex to get their `doc_id` and tree structure.
+
+#### Description Generation
+
+Generate a description for each document based on its PageIndex tree structure and node summaries.
+```python
+prompt = f"""
+You are given a table of contents structure of a document. 
+Your task is to generate a one-sentence description for the document that makes it easy to distinguish from other documents.
+    
+Document tree structure: {PageIndex_Tree}
+
+Directly return the description, do not include any other text.
+"""
+```
+
+#### Search with LLM
+
+Use an LLM to select relevant documents by comparing the user query against the generated descriptions.
+
+Below is a sample prompt for document selection based on their descriptions:
+
+```python
+prompt = f""" 
+You are given a list of documents with their IDs, file names, and descriptions. Your task is to select documents that may contain information relevant to answering the user query.
+
+Query: {query}
+
+Documents: [
+    {
+        "doc_id": "xxx",
+        "doc_name": "xxx",
+        "doc_description": "xxx"
+    }
+]
+
+Response Format:
+{{
+    "thinking": "<Your reasoning for document selection>",
+    "answer": <Python list of relevant doc_ids>, e.g. ['doc_id1', 'doc_id2']. Return [] if no documents are relevant.
+}}
+
+Return only the JSON structure, with no additional output.
+"""
+```
+
+#### Retrieve with PageIndex
+
+Use the PageIndex `doc_id` of the retrieved documents to perform further retrieval via the PageIndex retrieval API.
+
+
+
+## 💬 Help & Community
+Contact us if you need any advice on conducting document searches for your use case.
+
+- 🤝 [Join our Discord](https://discord.gg/VuXuf29EUj)  
+- 📨 [Leave us a message](https://ii2abc2jejf.typeform.com/to/meB40zV0)