Use this skill to manage Rust toolchains with rustup: install or update channels, add cross-compilation targets and components, and select a toolchain for a project or command. It explains overrides, proxy commands, profiles, and related environment settings.
Use when working with the rustup CLI — the Rust toolchain multiplexer. Covers installing/updating/uninstalling toolchains, channel syntax (stable/beta/nightly, dated, versioned), cross-compilation targets, components and profiles, directory and file overrides (rust-toolchain.toml), the proxy/shim dispatch system (cargo/rustc/rustdoc/rustfmt/rust-analyzer), `rustup run`, `+toolchain` shorthand, self-management, shell completions, and environment variables. Triggers on: "rustup", "rustup install", "rustup update", "rustup toolchain", "rustup target", "rustup component", "rustup override", "rustup run", "rustup which", "rustup doc", "rustup man", "rustup self", "rustup show", "rustup set", "rustup home", "rustup completions", "rustup check", "rustup default", "+toolchain", "rust-toolchain.toml", "RUSTUP_HOME", "RUSTUP_TOOLCHAIN", "RUSTUP_AUTO_INSTALL", "rustup profile", "rustup proxy", "rust-analyzer proxy", "cargo-miri".
Run score Not tested
See how to installReview the instructions the agent will receive before you install.
Reference for rustup — the Rust toolchain installer and multiplexer. Covers the full CLI surface, the proxy dispatch system, toolchain resolution, cross-compilation, and configuration.
Command line
→ rustup binary (multi-call: arg0 selects mode)
→ rustup_mode : rustup <subcommand> ... (management)
→ proxy_mode : cargo / rustc / ... (tool dispatch)
→ setup_mode : rustup-init (installer)
→ toolchain resolution
1. +toolchain shorthand
2. RUSTUP_TOOLCHAIN env var
3. rustup override (dir override, closest wins)
4. rust-toolchain.toml / rust-toolchain file (closest wins)
5. default toolchain
→ install-on-run (if RUSTUP_AUTO_INSTALL=1)
→ exec real toolchain binary with configured env
Load the reference that matches your task. When in doubt, load multiple references.
| Keywords | Reference |
|---|---|
| install, uninstall, update, default, check, show, set, home, completions, help, global flags, --verbose, --quiet, --version, --no-self-update, top-level commands | references/cli.md |
| toolchain, install, uninstall, list, link, custom toolchain, channel, stable, beta, nightly, versioned, dated, target triple, host, spec syntax, toolchain name | references/toolchain.md |
| target, cross-compilation, target add, target list, target remove, rust-std, std library, linker, --target, --toolchain, --installed | references/target.md |
| component, add, remove, list, rustc, cargo, rustfmt, rust-docs, rust-analyzer, clippy, miri, rust-src, llvm-tools, rls, --target, --toolchain, profile, minimal, default, complete | references/component.md |
| override, override set, override unset, override list, rust-toolchain.toml, rust-toolchain file, toolchain resolution, precedence, RUSTUP_TOOLCHAIN, +toolchain, settings.toml, directory override | references/override.md |
| proxy, shim, cargo, rustc, rustdoc, rustfmt, rust-analyzer, clippy-driver, cargo-clippy, cargo-miri, rls, rust-gdb, rust-lldb, multi-call binary, rustup run, +toolchain shorthand, which, doc, man, install-on-run, recursion protection | references/proxy.md |
| environment variables, RUSTUP_HOME, CARGO_HOME, RUSTUP_TOOLCHAIN, RUSTUP_DIST_SERVER, RUSTUP_UPDATE_ROOT, RUSTUP_AUTO_INSTALL, RUSTUP_LOG, RUSTUP_TERM_COLOR, RUSTUP_IO_THREADS, settings.toml, configuration | references/environment.md |
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