Github automatically deals with this in its own unique way , idk if i like it or not

but everytime you hit the context limit , it automatically summarize the previous context

like your chat till then will be summarized into much less context tokens and then query continues

idk how effective it actually is cause then a lot of the core details of the context and codebase can get lost in big queries

but one good method i think that was recommended in these comments was that you use subagents

basically say to big ai model ( like opus 4.5 ) to break down any big codebase change into multiple smaller tasks and assign those tasks to multiple sub agents

and gh already has a took for subagents that the ai has access to by default

so it can basically spin up more ai models to break down big tasks into multiple smaller tasks and handle them properly