# numtide/devshell

Per project developer environments

Repository: https://github.com/numtide/devshell
Canonical: https://ross.abutalabs.com/products/devshell
Homepage: https://numtide.github.io/devshell/
Language: Nix
License: MIT
License Family: permissive
Topics: nix, toml, direnv
Last push: 2026-06-18T20:01:15+00:00

## Health v2 (maintenance only)
Score: 72/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 88, release rhythm 35, longevity 100
- inputs: {"age_days": 2220, "days_push": 76, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1549, forks 91 (observed 2026-08-28T04:05:02.042270+00:00)

## What it is
devshell is a Nix-based tool for defining per-project developer environments, configured via TOML and integrated with nix-shell, direnv, and nix flakes. It provides a clean shell environment with project-scoped dependencies so contributors can start working within minutes of cloning a repo.

## Use cases
- set up per-project development environments with nix
- onboard new contributors with a single command
- replace virtualenv-style workflows for all languages
- get a clean shell environment without stdenv pollution
- integrate dev shells with direnv and nix flakes
- define project dependencies in a toml file

## When to choose
- your team uses Nix and wants reproducible, per-project dev shells
- you want a cleaner environment than mkShell with fewer exported variables
- you need multi-language project dependencies managed declaratively

## When to avoid
- you don't use or want to adopt the Nix package manager
- you need Windows-native development environments
- you want a fully stable, guaranteed API (project is marked unstable)

## Facets
- artifact type: library
- maturity: active
- function: developer-tools, configuration-management, cli
- domain: developer-tools
- platform: cli
- tags: nix, direnv, development-environment, reproducible-environments, toml, devops, command-line, linux, macos

## Member repositories
- numtide/devshell (main) score 72

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:02.042270+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 2026-08-30T04:30:23.523642+00:00, confidence not recorded.
  - readme: https://github.com/numtide/devshell (fetched 2026-08-28T04:05:02.042270+00:00, sha 21c052389de2)
  - homepage: https://numtide.github.io/devshell/ (fetched 2026-08-29T11:31:04.695836+00:00, sha a0c4453d4fd7)
- Data as of 2026-08-30T08:39:29.467469+00:00.