I use dynamic context compaction in open code plugin. Then modified it further to include eviction.

Since I run everything local, speed benefits from keeping context low ~128k. This gets me through a single agent on multiple tasks through the same repo. It seems to break around 6M but that's more probablistic.

KV cache is definitely valuable but context poisoning happens regardless of size and it's probability increases regardless of intelligence. So at some point you're going to suffer from context overload regardless.