There is one feature in Claude Code which is often overlooked and I haven't seen it in any of the other agentic tools: There is a tool called "sub-agent", which creates a fresh context windows in which the model can independently work on a clearly defined sub-task. This effectively turns Claude Code from a single-agent model to a hierarchical multi-agent model (I am not sure if the hierarchy goes to depths >2).

I wonder if it is a concious decision not to include this (I imagine it opens a lot of possibilities of going crazy, but it also seems to be the source of a great amount of Claud Code's power). I would very much like to play with this if it appears in gemini-cli

Next step would be the possibility to define custom prompts, toolsets and contexts for specific re-occuring tasks, and these appearing as tools to the main agent. Example for such a thing: create_new_page. The prompt could describe the steps one needs to create the page. Then the main agent could simply delegate this as a well-defined task, without cluttering its own context with the operational details.