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# wasi-host — the WASI sandbox (`wasi-run`)

`wasi-host` runs `wasm32-wasip1` modules in a sandbox: the wasmi engine, WASI preview1 over the in-memory file system of [vfs](https://md.mova.elamur.ai/free/en/docs/vfs/), a virtual clock, seeded randomness and no network. The binary is `wasi-run`.

Its design, commands, the gate and its limits are documented with the file system in [vfs — file system for the execution sandbox](https://md.mova.elamur.ai/free/en/docs/vfs/) (section "WASI host"); the place of the sandbox in Mova is in [Context, layers and memory](https://md.mova.elamur.ai/free/en/docs/repo-docs/context/), "Execution sandbox: the SLM programs, bytecode, an in-memory file system".

```
cargo build --release -p wasi-host
cargo test -p wasi-host
```