MCP servers in Claude Code

Claude Code stores MCP servers under an "mcpServers" object in ~/.claude.json. It also reads a project-scoped .mcp.json and supports adding servers from the command line with "claude mcp add". Each entry must declare either a "type" or a "command"; Claude Code refuses an entry that has neither. Remote servers connect natively over Streamable HTTP with OAuth.

Where the config lives

macOS / Linux: ~/.claude.json

Worked example: Fetch

Here's the exact config to add the Fetch MCP server to Claude Code. Every server in the directory has a ready-to-paste Claude Code config like this.

Add to ~/.claude.json

~/.claude.json

json

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

Or via CLI

bash

claude mcp add fetch -- uvx mcp-server-fetch