Add custom slash commands

[jeffwllms]

It would be great to see the ability to add custom / commands. I know there is the ability to make extensions, I am not certain this is the same thing, or how to use extensions.

[contributorai]

Without adding any code complexity, the LLM should be able to take instructions through GEMINI.md/AGENTS.md : "when user says /custom_command then take XYZ action."

Similar to the workaround of apply_patch not (consistently) working in openAi's codex cli remedied via custom instructions in AGENTS.md:

openai/codex#62

Another option, for something really complex, is to write a custom MCP (via FastMCP ) and plug in your custom mcp with custom_command tool.