mise

Mise is a polyglot development tool manager that handles tool versions, environment variables, and task running in a single CLI. It replaces asdf, nvm, pyenv, direnv, and Makefiles with a unified mise.toml configuration per project.

When to use: Managing multiple language runtimes per project, defining reproducible dev environments, running project tasks with dependencies, replacing scattered .nvmrc/.python-version/.tool-versions files, automating CI pipelines.

When NOT to use: Container-only workflows where all tools live in Docker images, single-language projects already well-served by their native version manager, production runtime management (mise is a dev tool).

Mise (formerly rtx) polyglot tool version manager, environment variable manager, and task runner. Covers tool version management (install, use, pin across Node/Python/Rust/Go/Java and more), mise.toml task definitions (scripts, dependencies, watch mode, incremental builds), environment variable management (.env integration, per-directory env, redaction), project-level tool pinning, backend system (asdf, npm, pipx, cargo, GitHub releases), and comparison with alternatives (asdf, nvm, pyenv, Makefiles). Use when configuring development tool versions, defining project tasks in mise.toml, managing per-project environment variables, setting up polyglot dev environments, migrating from asdf or nvm, or automating build/test/lint/deploy workflows with mise run. Source: oakoss/agent-skills.