How to Use Cargo Workspaces for Multi-Crate Projects

Use a root Cargo.toml with a [workspace] section to group multiple crates into a single build unit. This allows you to run cargo build or cargo test from the root directory to build all members simultaneously.

[workspace]
members = [
    "packages/trpl",
    "packages/mdbook-trpl",
]

Ensure each member crate has its own Cargo.toml file in its respective directory.

A Cargo workspace lets you manage multiple related Rust projects as one unit. Instead of navigating into each folder to build or test them individually, you run commands once from the top level. Think of it like a folder containing several apps that share a common build process.