`/mcp enable/disable` ignores list of defined MCP servers

[jack5github]

Describe the bug

The CLI freely allows you to enable and disable MCP servers that do not exist, not showing an error of any sort.

Affected version

0.0.389 Commit: 95ae76e

Steps to reproduce the behavior

1. Open copilot.
2. Execute /mcp disable this_mcp_server_does_not_exist. CLI will return MCP server "this_mcp_server_does_not_exist" has been disabled for this session.
3. Execute /mcp enable this_mcp_server_does_not_exist. CLI will return MCP server "this_mcp_server_does_not_exist" has been enabled for this session.

Expected behavior

An error should appear telling the user that the named MCP server does not exist.

Additional context

• Operating system: Microsoft Windows 11 Pro 10.0.26200 Build 26200
• CPU architecture: x64-based PC
• Terminal emulator: PowerShell