A

Arize Phoenix

Official

Provides a unified interface to Arize Phoenix's capabilities for managing prompts, exploring dataset...

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Updated Dec 30, 2025
Not audited
Provides a unified interface to Arize Phoenix's capabilities for managing prompts, exploring datasets, and running experiments across different LLM providers
  1. Click the "Install Now" button to open the FastMCP connection interface (the form where you add environment variables for the MCP server).
  2. In the FastMCP form add the following environment variable keys exactly as shown:
    • PHOENIX_BASE_URL
    • PHOENIX_API_KEY.
      (These are the environment variables the Phoenix MCP server reads.) (arize.com)
  3. Determine the correct PHOENIX_BASE_URL to use:
  4. Obtain a PHOENIX_API_KEY from your Phoenix web UI:
    1. Log in to your Phoenix web interface with your user account (or as an administrator if you need system-level keys).
    2. Open Settings → API Keys (or Space Settings → API Key) in the Phoenix UI.
    3. Create a new key: choose a User API Key for personal/interactive use or a System API Key if you need an automated/programmatic key (System keys can only be created by admins).
    4. Copy and securely save the key immediately — the full key is shown only once at creation.
      Paste that key as the value for PHOENIX_API_KEY in the FastMCP form. (arize.com)
  5. (Optional, advanced) If you need to automate key creation via API, you can enable programmatic API-key generation by setting a PHOENIX_ADMIN_SECRET in your Phoenix deployment and using the API endpoints to create keys. Use a System/Admin workflow only if you control the Phoenix deployment. (arize.com)
  6. After pasting PHOENIX_BASE_URL and PHOENIX_API_KEY into the FastMCP connection interface, click Save / Connect (or the equivalent button) to install the MCP server with those environment values.
  7. Verify the connection (in FastMCP or the MCP server logs): test a simple operation such as listing projects or opening the Phoenix MCP UI; if authentication fails, double-check the API key and base URL and regenerate a key if necessary. (arize.com)
  8. (Alternative) Instead of environment variables, you may also supply base URL and API key as command arguments per the Phoenix MCP README (for example: --baseUrl "https://your-phoenix-instance.com" --apiKey "your-api-key") if FastMCP supports passing args to the MCP server. (arize.com)

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