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Works with

Claude CodeClaude DesktopCursorVS CodeClineCodex CLIOpenClaw+ any MCP client

Install to Claude Code

This server doesn't publish a one-line install command. Follow the setup in the source repository.

Summary

A semantic search MCP server for YouTube transcripts using OpenAI embeddings and ChromaDB, enabling natural language queries to find conceptually similar content beyond keyword matching.

README.md

RAG MCP Claude

MCP (Model Context Protocol) Server สำหรับ Semantic Search บน YouTube transcripts ใช้ OpenAI Embeddings + ChromaDB

ต่างจาก keyword search ทั่วไป (FTS5) ที่ค้นได้เฉพาะ "คำตรงกัน" RAG ค้นหาด้วย ความหมาย ได้ เช่น ค้นว่า "วิธีฝึกจิตให้เข้มแข็ง" จะเจอข้อความเกี่ยวกับ "สมาธิ" แม้ไม่มีคำว่า "ฝึกจิต" ในข้อความเลย

ดูรายละเอียดเปรียบเทียบ RAG vs Keyword Search ที่ docs/concept-comparison.md

Features

  • rag_search - ค้นหาด้วย semantic similarity (ความหมายใกล้เคียง)
  • rag_ingest - นำ transcript / text เข้า knowledge base
  • rag_list_collections - แสดง collections พร้อมสถิติ
  • rag_delete - ลบข้อมูลออกจาก knowledge base

Architecture

                         rag-mcp-claude
                         Port: 3020
┌──────────────────────────────────────────────────┐
│                                                  │
│  ┌──────────┐    ┌─────────────┐                 │
│  │  Ingest   │───▶│ Text Splitter│                 │
│  │  Pipeline │    │ (chunk 500   │                 │
│  └──────────┘    │  overlap 50) │                 │
│                   └──────┬──────┘                 │
│                          ▼                        │
│                  ┌───────────────┐                │
│                  │ OpenAI API     │                │
│                  │ text-embedding │                │
│    ┌──────┐      │ -3-small       │                │
│    │Search│─────▶│ (1536 dims)   │                │
│    └──────┘      └───────┬───────┘                │
│                          ▼                        │
│                  ┌───────────────┐                │
│                  │  ChromaDB      │                │
│                  │  Vector Store  │                │
│                  │  (cosine sim)  │                │
│                  └───────────────┘                │
│                                                  │
└──────────────────────────────────────────────────┘

Quick Start

1. สร้าง OpenAI API Key

ไปที่ https://platform.openai.com/api-keys แล้วสร้าง key

2. สร้าง .env

cp .env.example .env
# แก้ไข .env ใส่ API key
OPENAI_API_KEY=sk-your-api-key-here

3. Deploy ด้วย Docker

docker compose up -d

จะ start 2 containers:

  • rag-chromadb - Vector database (port 8100)
  • rag-mcp-claude - MCP server (port 3020)

4. ตรวจสอบ

curl http://localhost:3020/health

5. Ingest transcript ตัวอย่าง

# Ingest ทุกไฟล์ใน data/sources/
node src/cli-ingest.js --dir ./data/sources

# Ingest ไฟล์เดียว
node src/cli-ingest.js data/sources/SF6Tskjx6Qw.md

ดูคู่มือ ingest ละเอียดที่ docs/guide-ingest.md

MCP Client Configuration

เพิ่มใน .mcp.json หรือ Claude Desktop config:

{
  "mcpServers": {
    "rag": {
      "url": "http://localhost:3020/mcp"
    }
  }
}

Project Structure

rag-mcp-claude/
├── src/
│   ├── server-sse.js    # Streamable HTTP transport server (port 3020)
│   ├── index.js         # Stdio transport server
│   ├── config.js        # Configuration
│   ├── embeddings.js    # OpenAI embedding API wrapper
│   ├── vectorstore.js   # ChromaDB operations (CRUD)
│   ├── ingest.js        # Chunk → Embed → Store pipeline
│   ├── search.js        # Semantic search
│   └── cli-ingest.js    # CLI batch ingest tool
├── data/
│   └── sources/         # Transcript files (.md)
├── docs/
│   ├── concept-comparison.md  # RAG vs FTS5 comparison
│   ├── guide-ingest.md        # คู่มือ ingest ข้อมูล
│   ├── guide-search.md        # คู่มือ search
│   └── guide-openai-key.md    # คู่มือสร้าง OpenAI API Key
├── Dockerfile
├── docker-compose.yml
├── .env.example
└── package.json

API Endpoints

| Endpoint | Method | Description | |-------------|--------|--------------------------| | /mcp | POST | MCP message endpoint (Streamable HTTP) | | /mcp | GET | SSE stream endpoint | | /mcp | DELETE | Session termination | | /health | GET | Health check + status |

MCP Tools Reference

rag_search

ค้นหาจาก knowledge base ด้วย semantic search

| Parameter | Type | Required | Default | Description | |-------------|--------|----------|------------------------|----------------------------| | query | string | Yes | - | คำค้นหา (ภาษาธรรมชาติ) | | collection| string | No | youtube_transcripts | ชื่อ collection | | top_k | number | No | 5 | จำนวนผลลัพธ์ (max 20) |

Response: ``json { "query": "สมาธิเปลี่ยนสมองได้อย่างไร", "collection": "youtube_transcripts", "totalResults": 3, "sources": [ { "source": "SF6Tskjx6Qw", "title": "Ep0 - Journey Within: สำรวจโลกในหัวคุณ", "url": "https://www.youtube.com/watch?v=SF6Tskjx6Qw", "channel": "The Mind Architect", "chunks": [ { "text": "สมาธิทำให้สมองส่วน Prefrontal Cortex หนาขึ้น...", "score": 0.892, "chunk_index": 3 } ] } ] } ``

rag_ingest

นำข้อมูลเข้า knowledge base

| Parameter | Type | Required | Description | |-------------|--------|----------|------------------------------------------| | file_path | string | No | Path ของ transcript markdown file (.md) | | text | string | No | ข้อความที่จะ ingest โดยตรง | | source | string | No | ชื่อแหล่งข้อมูล (เช่น video ID) | | title | string | No | ชื่อเรื่อง | | collection| string | No | ชื่อ collection |

*ต้องระบุอย่างน้อย file_path หรือ text

rag_list_collections

แสดง collections ทั้งหมดพร้อมจำนวน documents

Response: ``json { "total": 1, "collections": [ { "name": "youtube_transcripts", "count": 45 } ] } ``

rag_delete

ลบข้อมูลออกจาก knowledge base

| Parameter | Type | Required | Description | |--------------------|---------|----------|--------------------------------| | collection | string | Yes | ชื่อ collection | | source | string | No | ลบ documents จาก source นี้ | | delete_collection| boolean | No | ลบทั้ง collection |

Environment Variables

| Variable | Default | Description | |--------------------|--------------------------|---------------------------------| | PORT | 3020 | Server port | | HOST | 0.0.0.0 | Server host | | OPENAI_API_KEY | (required) | OpenAI API key | | EMBEDDING_MODEL | text-embedding-3-small | OpenAI embedding model | | CHROMA_URL | http://localhost:8100 | ChromaDB URL | | CHROMA_COLLECTION| youtube_transcripts | Default collection name | | CHUNK_SIZE | 500 | Tokens per chunk | | CHUNK_OVERLAP | 50 | Overlap tokens between chunks | | DEFAULT_TOP_K | 5 | Default search results |

Docker Details

| Container | Image | Port | Description | |-----------------|------------------------|------|------------------| | rag-mcp-claude| node:22-slim (custom) | 3020 | MCP server (Streamable HTTP) | | rag-chromadb | chromadb/chroma:latest | 8100 | Vector database |

  • ChromaDB data persisted in Docker volume chroma-data
  • RAG server ใช้ network_mode: host เพื่อเข้าถึง ChromaDB
  • OpenAI API Key ส่งผ่าน .env file

Data Flow

YouTube Video
     │  (youtube-mcp-claude ดึง transcript)
     ▼
data/sources/*.md        ← Transcript files
     │
     ▼ (rag_ingest / cli-ingest.js)
┌────────────────┐
│ 1. Parse        │  แยก metadata + transcript text
│ 2. Chunk        │  ตัดเป็นท่อนๆ (500 tokens, overlap 50)
│ 3. Embed        │  OpenAI API → vector [1536 dims]
│ 4. Store        │  ChromaDB (cosine similarity index)
└────────────────┘
     │
     ▼ (rag_search)
┌────────────────┐
│ 1. Embed query  │  แปลงคำถามเป็น vector
│ 2. Search       │  หา vectors ที่ใกล้เคียงที่สุด
│ 3. Return       │  ส่งกลับ chunks + metadata + score
└────────────────┘

Cost Estimation (OpenAI)

| Model | Price | 1 transcript (~10K tokens) | 1 search query | |--------------------------|--------------------|-----------------------------|----------------| | text-embedding-3-small | $0.02 / 1M tokens | ~$0.0002 (< 1 สตางค์) | ~$0.000002 | | text-embedding-3-large | $0.13 / 1M tokens | ~$0.0013 | ~$0.000013 |

ใช้ text-embedding-3-small ราคาถูกมาก ingest transcript 1,000 วิดีโอ ≈ $0.20 (7 บาท)

Related Projects

| Server | Port | Description | |--------------------|------|--------------------------------| | youtube-mcp-claude | 3010 | YouTube transcript extraction | | rag-mcp-claude | 3020 | RAG semantic search | | chat-mcp-claude | 3001 | Chat history (FTS5) | | thudong-mcp-claude | 3002 | Survey analysis (FTS5) |

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