Mix

Mix is Elixir's standard project and build CLI. It is the main action surface for creating applications, resolving dependencies, compiling code, running tests, and assembling releases inside an Elixir repo.

• Create new Elixir apps and umbrella projects, define project metadata in mix.exs, and add project-specific tasks or aliases.
• Fetch and inspect dependencies, work with environment-specific settings, and manage project state through mix.exs, mix.lock, and task flags.
• Compile code, run targeted or stale tests, analyze cross-file dependencies, and build deployable releases with bundled runtime scripts.

• Tasks are explicit subcommands, mostly non-interactive, and work cleanly with arguments plus environment variables such as MIX_ENV, MIX_TARGET, and MIX_EXS.
• mix help, per-task docs, and mix xref graph --format json --output - give agents a learnable CLI plus a real structured inspection path, but most build and test output is still text-first.
• Best fit for agents already operating inside an Elixir project, where Mix becomes the inspect, change, and verify layer around dependency state, compilation, tests, and releases.

• Mix is bundled with Elixir rather than shipped as a standalone tool, so install and behavior track the surrounding Elixir and Erlang/OTP versions.
• Some workflows depend on local project state, Hex availability, network access, or matching target OS and ABI when building releases.