# moonrepo/proto

A pluggable multi-language version manager.

Repository: https://github.com/moonrepo/proto
Canonical: https://ross.abutalabs.com/products/proto
Homepage: https://moonrepo.dev/proto
Language: Rust
License: MIT
License Family: permissive
Topics: toolchain, toolchain-manager, version-manager, nodejs, deno, bun, golang
Last push: 2026-08-24T16:14:43+00:00

## Health v2 (maintenance only)
Score: 93/100 (v2, computed 2026-09-03T02:39:23.370411+00:00)
- activity 99, release rhythm 87, longevity 92
- inputs: {"age_days": 1294, "days_push": 9, "days_rel": 10, "gap_med": 5, "n_releases_24m": 100}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1399, forks 92 (observed 2026-08-28T04:04:37.035997+00:00)

## What it is
proto is a pluggable multi-language version manager written in Rust that manages programming language toolchains (Node, Python, Go, Rust, Bun, Deno, and more) through a single CLI. It supports contextual version detection, checksum verification, and extensibility via WASM plugins, including compatibility with asdf plugins.

## Use cases
- manage node and python versions with one tool
- replace nvm pyenv and rustup with a single version manager
- install multiple language toolchains across a team consistently
- pin tool versions per project directory
- use asdf plugins through a faster rust version manager
- set up reproducible toolchains in CI

## When to choose
- you work across multiple languages and want one unified toolchain manager
- you want fast, cross-platform version management written in Rust
- you need per-directory or per-project tool version pinning
- you want to extend version management to custom tools via WASM plugins

## When to avoid
- you only use a single language and its native version manager suffices
- you rely on version managers with features proto does not emulate
- your team is already standardized on asdf, mise, or similar tools

## Facets
- artifact type: cli-tool
- maturity: active
- function: cli, developer-tools, configuration-management, plugin-system
- domain: developer-tools
- platform: windows, cross-platform, cli, rust
- tags: version-manager, toolchain, wasm-plugins, asdf-compatible, multi-language, command-line, automation, linux, macos

## Member repositories
- moonrepo/proto (main) score 93

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:37.035997+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:39:10.902176+00:00, confidence not recorded.
  - readme: https://github.com/moonrepo/proto (fetched 2026-08-28T04:04:37.035997+00:00, sha 4b655f927e80)
  - homepage: https://moonrepo.dev/proto (fetched 2026-08-29T11:53:29.388717+00:00, sha 302790fa4d3b)
  - site_page: https://moonrepo.dev/docs (fetched 2026-08-29T11:53:29.391260+00:00, sha 75aaf537f415)
  - site_page: https://moonrepo.dev/docs/proto (fetched 2026-08-29T11:53:29.393395+00:00, sha 00b82dbeb2c0)
  - site_page: https://moonrepo.dev/docs/guides/ci (fetched 2026-08-29T11:53:29.395178+00:00, sha 68b71d7b02b5)
  - site_page: https://moonrepo.dev/docs/proto/install (fetched 2026-08-29T11:53:29.396893+00:00, sha eeae3797da43)
  - site_page: https://moonrepo.dev/docs/proto/tools (fetched 2026-08-29T11:53:29.398418+00:00, sha 3bda9e2ea256)
  - site_page: https://moonrepo.dev/docs/proto/tool-spec (fetched 2026-08-29T11:53:29.399934+00:00, sha ae3e760fd4d5)
- Data as of 2026-08-30T08:39:29.467469+00:00.