To add an MCP server to OpenCode, just follow these steps:

• Open opencode.json config file for editing, e.g. nano .config/opencode/opencode.json on macOS.
• Add the following section:

"mcp": {
    "my-remote-mcp": {
      "type": "remote",
      "url": "https://my-mcp-server.com",
      "enabled": true,
      "headers": {
        "Authorization": "Bearer MY_API_KEY"
      }
    }
  }

If opencode.json already has data in it, make sure to paste the above after schema and to add a , after the last closing braces, or opencode will error out.

Sources:

https://opencode.ai/docs/mcp-servers