Mise

mise - Development Environment Management

This skill activates when working with mise for managing tool versions, environment variables, and project tasks.

When to Use This Skill

Activate when:

• Setting up development environments
• Managing tool and runtime versions (Node.js, Python, Ruby, Go, etc.)
• Configuring environment variables and secrets
• Defining and running project tasks
• Creating reproducible development setups
• Working with monorepos or multiple projects

What is mise?

Current stable: v2026.3.15

mise is a polyglot runtime manager and development environment tool that combines:

• Tool version management - Install and manage multiple versions of dev tools
• Environment configuration - Set environment variables per project
• Task automation - Define and run project tasks
• Cross-platform - Works on macOS, Linux, and Windows

Install with curl https://mise.run | sh (or brew install mise), then activate in the shell: eval "$(mise activate zsh)". Full install matrix, shims, IDE and CI/CD integration: references/setup-and-troubleshooting.md.

Tool Backends

mise uses different backends (package managers) to install tools:

• asdf - Traditional asdf plugins (default for many tools)
• github - GitHub release-asset installer (replaces deprecated ubi backend)
• cargo - Rust packages (requires Rust installed)
• npm - Node.js packages (requires Node installed)
• go - Go packages (requires Go installed)
• aqua - Package manager
• pipx - Python packages (requires Python installed)
• gem - Ruby packages (requires Ruby installed)
• gitlab - Direct from GitLab repositories
• http - Direct HTTP downloads

Prefer registry short names (ripgrep) over backend-prefixed forms (cargo:ripgrep) when the tool is in the mise registry (mise registry | grep ). Fall back to an explicit backend prefix when the registry has no entry.

Per-backend detail — github backend options (exe, asset_pattern, extract_all, rename_exe), multi-arch platform keys, cargo prerequisites and git installs, upgrades and aliases: references/backends.md.

Verify Before Pinning — ls-remote

mise ls-remote : returns all available versions for any backend. Run this BEFORE pinning a version in mise.toml to confirm the backend can actually see the tool:

mise ls-remote node                  # registry tool
mise ls-remote github:sharkdp/fd     # explicit backend
mise registry | grep      # search the registry

Failure mode — the tool lives in a different repo than you expect. Sometimes the CLI binary is released from a different repository than the documentation or project homepage:

$ mise ls-remote github:juxt/allium | head -5
(no output)                          # wrong repo — homepage, no releases

$ mise ls-remote github:juxt/allium-tools | head -5
0.1.0                                # correct repo for the CLI releases

If ls-remote returns nothing, check whether the project publishes releases to a separate repository (e.g., a -tools, -cli, or -releases repo). Don't pin a version you haven't verified ls-remote can see. Per-backend ls-remote output examples: references/backends.md.

Installing and Using Tools

Key difference: mise install only installs tools; mise use installs AND adds the tool to your configuration file. mise use is the primary way to add tools to projects.

mise install                  # install everything in .mise.toml / .tool-versions
mise install node@20.10.0     # install without touching config

mise use node@20              # fuzzy version — saves "20" (default)
mise use --pin node@20.10.0   # exact version — saves "20.10.0"
mise use node@latest          # saves "latest"
mise use cargo:ripgrep@latest # explicit backend
mise use --remove node        # remove tool from config
mise use --force node@20      # force reinstall
mise use --dry-run node@20    # preview changes

Version pinning: fuzzy (node@20) auto-updates within the major version; --pin locks the exact version; latest always updates. Best Practice: Use fuzzy versions for flexibility, mise.lock for reproducibility.

Configuration file selection

mise use writes to configuration files in this priority order:

1. --global flag: ~/.config/mise/config.toml
2. --path flag: Specified file path
3. --env flag: .mise..toml
4. Default: mise.toml in current directory

.mise.toml Schema

[tools]
node = "20.10.0"
python = "3.12"
terraform = "latest"

# Backends - use quotes for namespaced tools
"cargo:ripgrep" = "latest"           # Requires rust installed
"github:sharkdp/fd" = "latest"       # GitHub releases
"npm:typescript" = "latest"          # Requires node installed
"github:nushell/nushell" = "latest"  # Nushell (structured shell)

# Version from file
node = { version = "lts", resolve = "latest-lts" }

mise reads configuration from multiple locations (in order):

1. .mise.toml - Project local config
2. .mise/config.toml - Project local config (alternative)
3. ~/.config/mise/config.toml - Global config
4. Environment variables - MISE_*

Environment Variables

[env]
DATABASE_URL = "postgresql://localhost/myapp"
NODE_ENV = "development"

# Go templates — {{ config_root }} is the directory containing mise.toml
APP_ROOT = "{{ config_root }}"
PATH = ["{{ config_root }}/bin", "$PATH"]

# File-based env vars
_.file = ".env"
_.path = ["/custom/bin"]

Secrets via mise set:

mise set SECRET_KEY sops://path/to/secret     # sops
mise set API_TOKEN age://path/to/secret       # age
mise set BUILD_ID "$(git rev-parse HEAD)"     # from command

Tasks

[tasks.build]
description = "Build the project"
run = "npm run build"
sources = ["src/**/*.ts"]      # Only run if sources changed
outputs = ["dist/**/*"]         # Check outputs for changes
dir = "frontend"                # Run in specific directory
env = { NODE_ENV = "production" }

[tasks.test]
description = "Run tests"
run = "npm test"

[tasks.lint]
description = "Run linter"
run = "npm run lint"
depends = ["build"]             # depends run first, in order

[tasks.ci]
description = "Run CI pipeline"
depends = ["lint", "test"]

[tasks.watch]
run = "npm run watch"
raw = true                      # Don't wrap in shell

mise run build            # run a task
mise build                # short form
mise run lint test        # run multiple tasks
mise tasks                # list available tasks
mise run script -- arg1   # pass arguments

Define a ci task that aggregates the project's format, lint, and test checks — mise run ci is the local quality gate other skills and agents in this workspace invoke before commit. File-based tasks (.mise/tasks/) and complete Node/Python/monorepo/multi-tool project setups: references/tasks-and-workflows.md.

Sandboxing

mise sandboxing restricts filesystem, network, and env access for mise exec / mise run using OS-level primitives (Landlock/seccomp on Linux, Seatbelt on macOS; Windows unsupported). Gotcha: mise settings experimental=true is required first — without it, deny/allow flags are silently no-ops.

mise x --deny-all --allow-read=. --allow-write=./dist --allow-net=registry.npmjs.org -- npm install

Full flag reference, platform support matrix, task-level config, and limitations: references/sandboxing.md. Runnable examples: templates/sandboxing.md.

Lock Files

mise lock                 # generate .mise.lock
mise install --locked     # use locked versions

[settings]
lockfile = true  # Auto-generate lock file

Templates

The templates/ directory contains reusable configuration snippets for common mise patterns:

• templates/multi-arch.md — platform-specific asset patterns for GitHub-release tools (pattern detail in references/backends.md)
• templates/sandboxing.md — runnable sandbox invocations

Best Practices

• Use .mise.toml for projects: Better than .tool-versions (more features)
• Pin versions in projects: Ensure consistency across team
• Use tasks for common operations: Document and standardize workflows
• Lock files in production: Use mise lock for reproducibility
• Global tools for dev: Set global defaults, override per project
• Environment per project: Keep secrets and config in .mise.toml
• Commit .mise.toml: Share config with team
• Don't commit .mise.lock: Let mise generate per environment
• Zero setup for team: Clone and mise install to get started

References

• references/backends.md — per-backend ls-remote examples, github backend options, multi-arch asset patterns, cargo backend, upgrades and aliases
• references/tasks-and-workflows.md — file-based tasks and complete project workflow examples (Node.js, Python, monorepo, multi-tool)
• references/sandboxing.md — sandbox flag reference, platform support matrix, task-level config, limitations
• references/setup-and-troubleshooting.md — installation matrix, shims, IDE integration, CI/CD integration (GitHub Actions, GitLab CI), troubleshooting, .tool-versions migration
• references/transitive-runtime-deps.md — mise exec does NOT auto-install transitive deps (Elixir-needs-Erlang failure mode); prefer portable secret-generation commands (openssl, python3, /dev/urandom)

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: vinnie357
• Source: vinnie357/claude-skills
• License: MIT

Install and usage instructions live in the source repository linked above.