// the find
matklad/cargo-xtask
cargo-xtask is a convention, not a library — it defines how to wire a Rust binary as a cargo subcommand using workspace aliases, giving you make-style task automation written in Rust. No install required, no external tools, just cargo and a .cargo/config.toml alias. Adopted widely enough that cargo itself uses it.
The zero-install story is real: clone the repo, run cargo xtask, it builds and runs automatically. Cross-platform by default since you're writing Rust instead of bash. The workspace-member approach means xtask shares the same lockfile and dependency update cycle as the rest of your project. Real-world adoption (rust-analyzer, helix, cargo itself) means the pattern is battle-tested, not theoretical.
This is a spec document, not a framework — you're on your own for argument parsing, error handling, and task structure. No lifecycle integration with cargo means you can't hook into cargo build or cargo test; you have to wrap them manually with your own cargo xtask build. No standard task conventions have emerged despite years of adoption, so every project invents its own interface. The compile time cost of the xtask binary can be surprising if you pull in heavy dependencies.