MCP server

W&B MCP Server

Queries Weights & Biases runs and Weave traces in plain language.

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Official

Install

uvx wandb-mcp-server

mcpServers

{
  "mcpServers": {
    "wandb-mcp": {
      "command": "uvx",
      "args": [
        "wandb-mcp-server"
      ]
    }
  }
}

Transport: both
Runtime: Python
Auth: Required
License: MIT

Tools

query_wandb_toolquery_weave_traces_toolcount_weave_traces_toolinfer_trace_schema_toolget_run_history_toolcreate_wandb_report_toollog_analysis_to_wandb

W&B MCP Server connects MCP clients to Weights & Biases, letting agents query run metrics, sampling histories, and LLM traces using natural language. The server reads from your W&B workspace and can write analysis back as shareable reports. It runs either as a hosted HTTP endpoint or locally via stdio with uvx.

Highlights

Query run metrics and sampling histories in natural language
Inspect and count LLM traces from Weave
Infer trace field schemas automatically
Write analysis results back to W&B as shareable reports
Hosted HTTP or local stdio deployment options

Ideal for ML teams using Weights & Biases to explore experiments and traces programmatically. Requires a W&B API key; both deployment modes are free to use.

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