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Claude Code

Use Claude Code with less capable LLMs.

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Updated Sep 9, 2025
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Use Claude Code with less capable LLMs.
  1. Locate the Claude CLI Executable on Your Machine

    • If you have not yet installed Claude CLI, follow the guide here: Claude Code CLI Setup.
    • After installation, find the full path to your claude CLI executable.
      • Example for Linux/macOS: /home/linuxbrew/.linuxbrew/bin/claude
      • Example for Windows: C:\Users\YourUser\AppData\Local\bin\claude.exe
  2. Complete Authentication for Claude CLI

    • Open your terminal and confirm that claude is authenticated and works (e.g., by running claude --help).
    • If authentication is not yet set up, follow the relevant instructions linked above to ensure you have completed the authentication step.
  3. Fill in the ENV Fields in the FastMCP Connection Interface

    • In the FastMCP interface, when prompted to add environment variables via the “Install Now” button, fill in the fields as follows:
      • CLAUDE_BIN: The full absolute path to your Claude CLI executable (from Step 1).
      • LOG_LEVEL (Optional): Set the desired logging level, e.g., info. You may leave this blank or set to info, debug, warn, or error as needed.
  4. Finish Setup

    • Continue setup as directed in FastMCP. If prompted, restart your MCP server or host application to apply changes.

Summary of Required ENVs:

  • CLAUDE_BIN (Required)
  • LOG_LEVEL (Optional)

You do not need to manually create a .env file if using the FastMCP interface—just provide the values in the connection settings.

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