Tauri makes it easy for a web interface to call Rust. That convenience can turn into a tangled application if every component invents its own command and the native layer becomes a collection of unrelated helpers.
I prefer the boundary to be small, explicit, and a little boring. The less surprising it is, the easier the application is to reason about.
Model tasks, not implementation steps
A command should represent a useful operation: start a transfer, inspect a folder, save a document, or cancel a running job. The frontend sends one validated request and receives a stable result.
Splitting one task into many tiny commands exposes ordering rules to the UI. It also creates intermediate states that are difficult to recover when one call fails. Letting Rust own the complete native workflow keeps filesystem and process behavior together.
Treat every argument as untrusted
The interface is part of the application, but command inputs still cross a security boundary. Paths need normalization and scope checks. Numeric values need limits. User-controlled strings should never be assembled into shell commands.
When an external process is necessary, structured arguments are safer than a single command string. The native layer should also define which executables and locations are allowed rather than accepting arbitrary values from the page.
Use events for meaningful progress
Long operations need progress without flooding the frontend. I emit updates at a controlled interval and use a consistent event shape containing the operation identifier, completed work, total work when known, and current phase.
The identifier matters when a user restarts an operation or navigates away. Late events from an older task can be ignored instead of overwriting the current interface.
Return errors people can act on
Rust errors are useful during development but often too technical for the final interface. Commands can return stable error codes with safe context. The frontend then translates those into a concise explanation and a recovery action.
A narrow command surface makes permissions easier to audit, tests easier to write, and future refactoring less risky. Native capability remains powerful precisely because the interface to it stays controlled.