Since this site seems to have an allergy to information density and usability, here's the GH:

https://github.com/mksglu/context-mode

Some discussion about this from a couple of months ago:

https://news.ycombinator.com/item?id=47193064

Similar tools in this space:

RTK:CLI proxy that reduces LLM token consumption: https://github.com/rtk-ai/rtk

8v: One CLI for you and your AI agent. Posted here a few days ago: https://news.ycombinator.com/item?id=47914963

Headroom:The Context Optimization Layer for LLM: https://github.com/chopratejas/headroom

Of these, it looks like RTK and 8v are somewhat equivalent, while headroom is complementary.

Although this does perhaps go further than rtk/v8.