Weights & Biases MCP Server

📊 W&B Models

Query experiment tracking data, runs, sweeps, and performance metrics using GraphQL.

🔍 W&B Weave

Access LLM traces, evaluations, and datasets with powerful filtering and pagination.

🤖 Support Agent

Get help from wandbot, the W&B RAG-powered support agent for product questions.

📝 Reports

Create and save W&B Reports with markdown text and HTML visualizations.

🚀 Quick Setup

📝 Cursor

Add to ~/.cursor/mcp.json:

"wandb": {
  "transport": "http", 
  "url": "https://mcp.withwandb.com/mcp",
  "headers": {
    "Authorization": "Bearer YOUR_WANDB_API_KEY",
    "Accept": "application/json, text/event-stream"
  }
}

🖥️ Claude Desktop

Add to claude_desktop_config.json:

{
  "mcpServers": {
    "wandb-stdio": {
      "command": "uvx",
      "args": ["--from", "git+https://github.com/wandb/wandb-mcp-server.git", "wandb-mcp-server"],
      "env": {
        "WANDB_API_KEY": "YOUR_WANDB_API_KEY"
      }
    }
  }
}

💬 LeChat

MCP Server URL: https://mcp.withwandb.com/mcp
Auth: Bearer token
Token: Your W&B API key

🤖 Gemini CLI

Install extension:

gemini extensions install https://github.com/wandb/wandb-mcp-server

Then set API key (choose one):
• export WANDB_API_KEY=your-key
• uvx wandb login (opens browser)

Get your API key: wandb.ai/authorize