Comment by mathstuf

There are a number of utilities for this. I use jai: https://jai.scs.stanford.edu/ but also have seen nono: https://github.com/always-further/nono smolvm: https://github.com/smol-machines/smolvm zerobox https://github.com/afshinm/zerobox and matchlock https://github.com/jingkaihe/matchlock

They all have pros and cons. Pick the one that suits you best. Then you're also agent harness flexible (I use opencode).