[simonw]

Yeah my ideal is to have something that cleanly "pip installs" as a dependency such that users of my open source Python projects can self host tools that let them extend using arbitrary code, including code written by LLMs.

I've been picking at this problem for a few years now!

On the one hand I get why it's so hard. But it really feels like it should be possible to solve this in 2026 - executing arbitrary code in a way that constrains its memory and CPU time usage is a problem our industry solves in browsers and hosting platforms and databases and all sorts of other places, and has done for decades.

The whole LLM-assisted end-user programming thing makes solving this with the right developer affordances so valuable!

[hiccuphippo]

If the code is gonna be written by LLMs anyway skip the js, directly use wasm and allow any language that compiles to it with something like https://extism.org/

[rattray]

Ah, in that context, why not just give the people workerd? People using & running OSS libraries are used to the fact that there might be vulns in libraries they're using, right?

[kentonv]

Or put another way:

If Simon's users choose to self-host the open source version of his service, they are probably using it to run their own code, and so the sandbox security matters less, and workerd may be fine. The sandbox only matters when Simon himself offers his software as a service, which he could do using Workers for Platforms.

(But this is a self-serving argument coming from me.)