Running multiple instances of same MCP server with different configs? #9634

Use Case

I need to access 2 Google Workspace accounts via the workspace-mcp server. The MCP server requires OAuth authentication on port 8000.

Problem

When configuring two instances of the same MCP in opencode.json:

{
  "google-personal": {
    "command": ["uvx", "workspace-mcp", "--single-user"],
    "environment": {
      "WORKSPACE_MCP_CREDENTIALS_DIR": "~/.google_workspace_mcp/credentials/personal",
      "USER_GOOGLE_EMAIL": "user@example.com"
    }
  },
  "google-work": {
    "command": ["uvx", "workspace-mcp", "--single-user"],
    "environment": {
      "WORKSPACE_MCP_CREDENTIALS_DIR": "~/.google_workspace_mcp/credentials/work",
      "USER_GOOGLE_EMAIL": "work@example.com"
    }
  }
}

Both instances try to use port 8000 for OAuth callback, causing conflicts.

Question

Is there a way in opencode to:

1. Start MCP instances sequentially (so OAuth can complete one at a time)?
2. Pass different port configurations to each instance?
3. Any other pattern for running multiple instances of the same MCP with different credentials?

The workspace-mcp server supports WORKSPACE_MCP_PORT env var, but I'm not sure if that helps with stdio transport.

Related

Also asked on workspace-mcp repo.