CLI should support user-defined slash commands for frequently used prompts

[RyanHecht]

Copilot CLI should support user-defined slash commands in which users can define frequently used prompts as Markdown files.

[localden]

This would really help with Spec Kit 😄

[doggy8088]

I believe the Copilot CLI should provide a similar experience to GitHub Copilot. We just need to wait. 😄

[aaronpowell]

It would also allow for better support for what we have available in Awesome Copilot

[EvanBoyle]

This should now be supported by configuring a custom agent: https://docs.github.com/en/copilot/how-tos/use-copilot-agents/coding-agent/create-custom-agents

You can configure an agent, then invoke it explicitly via /agent command.

Try it out and let us know if you have any feedback!