[bstrama]

Hi HN,

While building the execution runtime for our AI tool ecosystem (Gace), we originally planned to rely on local execution—similar to how OpenClaw handles things.

But the further we got, the more we realized that treating a user's laptop as a 24/7 background server for LLMs is an architectural anti-pattern. Two things killed it for us:

Latency: ReAct loops bouncing back and forth over home Wi-Fi ruin the UX.

Security: Running untrusted community scripts locally without absolute sandboxing is terrifying.

So we pivoted. We built a cloud sandbox using quickjs-emscripten that executes JS tools in strict isolates with 25ms cold starts. By putting the executor in the same data center as the LLM, the multi-step latency tax practically disappears. (For eventual local file access, we're building a dumb, permission-gated daemon rather than a heavy local execution engine).

I wrote down our technical reasoning on why we think the current "local-first" agent trend is structurally flawed. I'd love to hear your thoughts.