Mise — Dev Tool Manager for Every Language

What it is

Mise (formerly rtx) is a polyglot dev tool version manager that handles Node.js, Python, Ruby, Go, Rust, Java, and over 100 other tools from a single CLI. It replaces the collection of version managers (nvm, pyenv, rbenv, sdkman) that developers typically install and maintain separately. Mise reads .tool-versions or mise.toml files to automatically switch tool versions per project.

It targets developers working across multiple languages who want one tool instead of many for managing runtime versions.

How it saves time or tokens

Mise eliminates the overhead of installing and configuring separate version managers for each language. New team members run mise install and get the exact tool versions the project needs. For AI projects that use Python for ML, Node.js for frontend, and Go for backend, mise ensures everyone uses matching versions without manual coordination.

How to use

1. Install mise:

curl https://mise.run | sh

1. Install and use tool versions:

# Install and activate Node.js
mise use node@22
node --version  # v22.x.x

# Install and activate Python
mise use python@3.12
python --version  # 3.12.x

# Install multiple tools at once
mise use node@22 python@3.12 go@1.23

1. Pin versions per project:

# Creates .tool-versions or mise.toml in current directory
mise use --pin node@22 python@3.12

# Team members just run:
mise install

Example

# mise.toml - project configuration
[tools]
node = '22'
python = '3.12'
go = '1.23'

[env]
VIRTUAL_ENV = '.venv'

[tasks]
dev = 'npm run dev'
test = 'pytest && npm test'
lint = 'ruff check . && eslint .'

Related on TokRepo

• AI tools for DevOps -- Development operations tools
• AI tools for coding -- Developer tools and utilities

Common pitfalls

• Mise needs shell integration (eval in your .bashrc/.zshrc) to automatically switch versions when you cd into a project directory. Without it, you must run mise activate manually.
• Some tools have platform-specific builds. Check availability for your OS and architecture before adding exotic tools to your mise.toml.
• Mise is compatible with .tool-versions files from asdf, making migration straightforward. However, mise's toml format offers additional features like environment variables and task definitions.