flox-environments

사용 방법

설치 명령을 복사하고 자신의 에이전트 환경에 설치하기 전에 소스 패키지를 확인하세요.
필요한 도구, 인증 정보, 지원 환경은 원본 문서에서 확인하세요.
입력과 원하는 산출물을 설명하고 출처와 결과를 대조하세요.

npx skills add https://github.com/affaan-m/ecc --skill flox-environments

시작 전 확인

설치에는 모델 구독, API 한도, 파일 접근 권한이 포함되지 않습니다.
별점 수와 설치 수는 활동 지표이며 독립적인 품질·보안 검증이 아닙니다.

원본 Skill 문서

원본 저장소의 제목, 예시, 코드, 표, 링크, 이미지를 유지해 표시합니다.

Flox Environments

Flox creates reproducible development environments defined in a single TOML manifest. Every developer on the team gets identical packages, tools, and configuration — across macOS and Linux — without containers or VMs. Built on Nix with access to over 150,000 packages.

When to Activate

Use this skill when the user has an environment management problem — even if they haven't mentioned Flox. Flox is the right tool when:

The project needs system-level packages (compilers, databases, CLI tools) alongside language-specific dependencies
Reproducibility matters — the setup should work identically on a teammate's machine, in CI, or on a fresh laptop
The user needs multiple tools to coexist — e.g., Python 3.11 + PostgreSQL 16 + Redis + Node.js in one environment
Cross-platform support is needed (macOS and Linux from the same config)
AI agents need to install tools — Flox lets agents add packages to a project-scoped environment without sudo, system pollution, or sandbox restrictions

If the user just needs a single language runtime with no system dependencies, standard tooling (nvm, pyenv, rustup alone) may suffice. If they need full OS-level isolation, containers might be more appropriate. Flox sits in the sweet spot: declarative, reproducible environments without container overhead.

Prerequisite: Flox must be installed first — see flox.dev/docs for macOS, Linux, and Docker.

Core Concepts

Flox environments are defined in .flox/env/manifest.toml and activated with flox activate. The manifest declares packages, environment variables, setup hooks, and shell configuration — everything needed to reproduce the environment anywhere.

Key paths:

.flox/env/manifest.toml — Environment definition (commit this)
$FLOX_ENV — Runtime path to installed packages (like /usr — contains bin/, lib/, include/)
$FLOX_ENV_CACHE — Persistent local storage for caches, venvs, data (survives rebuilds)
$FLOX_ENV_PROJECT — Project root directory (where .flox/ lives)

Essential Commands

bash

flox init                       # Create new environment
flox search <package> [--all]   # Search for packages
flox show <package>             # Show available versions
flox install <package>          # Add a package
flox list                       # List installed packages
flox activate                   # Enter environment
flox activate -- <cmd>          # Run a command in the environment without a subshell
flox edit                       # Edit manifest interactively

Manifest Structure

toml

# .flox/env/manifest.toml

[install]
# Packages to install — the core of the environment
ripgrep.pkg-path = "ripgrep"
jq.pkg-path = "jq"

[vars]
# Static environment variables
DATABASE_URL = "postgres://localhost:5432/myapp"

[hook]
# Non-interactive setup scripts (run every activation)
on-activate = """
  echo "Environment ready"
"""

[profile]
# Shell functions and aliases (available in interactive shell)
common = """
  alias dev="npm run dev"
"""

[options]
# Supported platforms
systems = ["x86_64-linux", "aarch64-linux", "x86_64-darwin", "aarch64-darwin"]

Package Installation Patterns

Basic Installation

toml

[install]
nodejs.pkg-path = "nodejs"
python.pkg-path = "python311"
rustup.pkg-path = "rustup"

Version Pinning

toml

[install]
nodejs.pkg-path = "nodejs"
nodejs.version = "^20.0"          # Semver range: latest 20.x

postgres.pkg-path = "postgresql"
postgres.version = "16.2"         # Exact version

Platform-Specific Packages

toml

[install]
# Linux-only tools
valgrind.pkg-path = "valgrind"
valgrind.systems = ["x86_64-linux", "aarch64-linux"]

# macOS frameworks
Security.pkg-path = "darwin.apple_sdk.frameworks.Security"
Security.systems = ["x86_64-darwin", "aarch64-darwin"]

# GNU tools on macOS (where BSD defaults differ)
coreutils.pkg-path = "coreutils"
coreutils.systems = ["x86_64-darwin", "aarch64-darwin"]

Resolving Package Conflicts

When two packages install the same binary, use priority (lower number wins):

toml

[install]
gcc.pkg-path = "gcc12"
gcc.priority = 3

clang.pkg-path = "clang_18"
clang.priority = 5               # gcc wins file conflicts

Use pkg-group to group packages that should resolve versions together:

toml

[install]
python.pkg-path = "python311"
python.pkg-group = "python-stack"

pip.pkg-path = "python311Packages.pip"
pip.pkg-group = "python-stack"    # Resolves together with python

Language-Specific Recipes

Python with uv

toml

[install]
python.pkg-path = "python311"
uv.pkg-path = "uv"

[vars]
UV_CACHE_DIR = "$FLOX_ENV_CACHE/uv-cache"
PIP_CACHE_DIR = "$FLOX_ENV_CACHE/pip-cache"

[hook]
on-activate = """
  venv="$FLOX_ENV_CACHE/venv"
  if [ ! -d "$venv" ]; then
    uv venv "$venv" --python python3
  fi
  if [ -f "$venv/bin/activate" ]; then
    source "$venv/bin/activate"
  fi

  if [ -f requirements.txt ] && [ ! -f "$FLOX_ENV_CACHE/.deps_installed" ]; then
    uv pip install --python "$venv/bin/python" -r requirements.txt --quiet
    touch "$FLOX_ENV_CACHE/.deps_installed"
  fi
"""

Node.js

toml

[install]
nodejs.pkg-path = "nodejs"
nodejs.version = "^20.0"

[hook]
on-activate = """
  if [ -f package.json ] && [ ! -d node_modules ]; then
    npm install --silent
  fi
"""

Rust

toml

[install]
rustup.pkg-path = "rustup"
pkg-config.pkg-path = "pkg-config"
openssl.pkg-path = "openssl"

[vars]
RUSTUP_HOME = "$FLOX_ENV_CACHE/rustup"
CARGO_HOME = "$FLOX_ENV_CACHE/cargo"

[profile]
common = """
  export PATH="$CARGO_HOME/bin:$PATH"
"""

Go

toml

[install]
go.pkg-path = "go"
gopls.pkg-path = "gopls"
delve.pkg-path = "delve"

[vars]
GOPATH = "$FLOX_ENV_CACHE/go"
GOBIN = "$FLOX_ENV_CACHE/go/bin"

[profile]
common = """
  export PATH="$GOBIN:$PATH"
"""

C/C++

toml

[install]
gcc.pkg-path = "gcc13"
gcc.pkg-group = "compilers"

# IMPORTANT: gcc alone doesn't expose libstdc++ headers — you need gcc-unwrapped
gcc-unwrapped.pkg-path = "gcc-unwrapped"
gcc-unwrapped.pkg-group = "libraries"

cmake.pkg-path = "cmake"
cmake.pkg-group = "build"

gnumake.pkg-path = "gnumake"
gnumake.pkg-group = "build"

gdb.pkg-path = "gdb"
gdb.systems = ["x86_64-linux", "aarch64-linux"]

Hooks and Profile

Hooks — Non-Interactive Setup

Hooks run on every activation. Keep them fast and idempotent. Rule of thumb: if it should happen automatically, put it in `[hook]`; if the user should be able to type it, put it in `[profile]`.

toml

[hook]
on-activate = """
  setup_database() {
    if [ ! -d "$FLOX_ENV_CACHE/pgdata" ]; then
      initdb -D "$FLOX_ENV_CACHE/pgdata" --no-locale --encoding=UTF8
    fi
  }
  setup_database
"""

Profile — Interactive Shell Configuration

Profile code is available in the user's shell session.

toml

[profile]
common = """
  dev() { npm run dev; }
  test() { npm run test -- "$@"; }
"""

Anti-Patterns

Absolute Paths

toml

# BAD — breaks on other machines
[vars]
PROJECT_DIR = "/home/alice/projects/myapp"

# GOOD — use Flox environment variables
[vars]
PROJECT_DIR = "$FLOX_ENV_PROJECT"

Using exit in Hooks

toml

# BAD — kills the shell
[hook]
on-activate = """
  if [ ! -f config.json ]; then
    echo "Missing config"
    exit 1
  fi
"""

# GOOD — return from hook, don't exit
[hook]
on-activate = """
  if [ ! -f config.json ]; then
    echo "Missing config — run setup first"
    return 1
  fi
"""

Storing Secrets in Manifest

toml

# BAD — manifest is committed to git
[vars]
API_KEY = "<set-at-runtime>"

# GOOD — reference external config or pass at runtime
# Use: API_KEY="<your-api-key>" flox activate
[vars]
API_KEY = "${API_KEY:-}"

Slow Hooks Without Idempotency Guards

toml

# BAD — reinstalls every activation
[hook]
on-activate = """
  pip install -r requirements.txt
"""

# GOOD — skip if already installed
[hook]
on-activate = """
  if [ ! -f "$FLOX_ENV_CACHE/.deps_installed" ]; then
    uv pip install -r requirements.txt --quiet
    touch "$FLOX_ENV_CACHE/.deps_installed"
  fi
"""

Putting User Commands in Hooks

toml

# BAD — hook functions aren't available in the interactive shell
[hook]
on-activate = """
  deploy() { kubectl apply -f k8s/; }
"""

# GOOD — use [profile] for user-invokable functions
[profile]
common = """
  deploy() { kubectl apply -f k8s/; }
"""

Full-Stack Example

A complete environment for a Python API with PostgreSQL:

toml

[install]
python.pkg-path = "python311"
uv.pkg-path = "uv"
postgresql.pkg-path = "postgresql_16"
redis.pkg-path = "redis"
jq.pkg-path = "jq"
curl.pkg-path = "curl"

[vars]
UV_CACHE_DIR = "$FLOX_ENV_CACHE/uv-cache"
DATABASE_URL = "postgres://localhost:5432/myapp"
REDIS_URL = "redis://localhost:6379"

[hook]
on-activate = """
  if [ ! -d "$FLOX_ENV_CACHE/pgdata" ]; then
    initdb -D "$FLOX_ENV_CACHE/pgdata" --no-locale --encoding=UTF8
  fi

  venv="$FLOX_ENV_CACHE/venv"
  if [ ! -d "$venv" ]; then
    uv venv "$venv" --python python3
  fi
  if [ -f "$venv/bin/activate" ]; then
    source "$venv/bin/activate"
  fi

  if [ -f requirements.txt ] && [ ! -f "$FLOX_ENV_CACHE/.deps_installed" ]; then
    uv pip install --python "$venv/bin/python" -r requirements.txt --quiet
    touch "$FLOX_ENV_CACHE/.deps_installed"
  fi
"""

[profile]
common = """
  serve() { uvicorn app.main:app --reload --host 0.0.0.0 --port 8000; }
  migrate() { alembic upgrade head; }
"""

[services]
postgres.command = "postgres -D $FLOX_ENV_CACHE/pgdata -k $FLOX_ENV_CACHE"
redis.command = "redis-server --port 6379 --daemonize no"

[options]
systems = ["x86_64-linux", "aarch64-linux", "x86_64-darwin", "aarch64-darwin"]

Activate with services: flox activate --start-services

Environment Sharing

Flox environments are git-native. Commit the .flox/ directory and every collaborator gets the same environment:

bash

git add .flox/
git commit -m "Add Flox environment"
# Teammates just run:
git clone <repo> && cd <repo> && flox activate

For reusable base environments across projects, push to FloxHub:

bash

flox push                         # Push environment to FloxHub
flox activate -r owner/env-name   # Activate remote environment anywhere

Compose environments with [include]:

toml

[include]
base.floxhub = "myorg/python-base"

[install]
# Project-specific additions on top of base
fastapi.pkg-path = "python311Packages.fastapi"

AI-Assisted and Vibe Coding

Flox is ideal for AI-assisted development and vibe coding workflows. When an AI agent needs a tool that isn't available in the current environment — a compiler, a database, a linter, a CLI utility — it can add it to the project's Flox manifest without requiring sudo access, polluting system packages, or hitting sandbox restrictions.

Why this matters for agents:

No sudo required — flox install works entirely in user space, so agents can add packages without elevated permissions
Project-scoped — packages are installed into the project environment only, not globally, so different projects can have different versions without conflict
Sandbox-friendly — agents running in sandboxed or restricted environments can still install the tools they need through Flox
Reversible — every change is captured in manifest.toml, so unwanted packages can be removed cleanly with no system residue
Reproducible — when an agent sets up an environment, that exact setup is committed to git and works for everyone

Agent workflow pattern:

bash

# Agent discovers it needs a tool (e.g., jq for JSON processing)
flox search jq                    # Verify the package exists
flox install jq                   # Install into project environment

# Or for more control, edit the manifest directly
tmp_manifest="$(mktemp)"
flox list -c > "$tmp_manifest"
# Add the package to [install] section, then apply
flox edit -f "$tmp_manifest"

# Run a command with the tool available
flox activate -- jq '.results[]' data.json

This makes Flox a natural fit for any workflow where Claude Code or other AI agents need to bootstrap project tooling on the fly.

Debugging

bash

flox list -c                      # Show raw manifest
flox activate -- which python     # Check which binary resolves
flox activate -- env | grep FLOX  # See Flox environment variables
flox search <package> --all       # Broader package search (case-sensitive)

Common issues:

Package not found: Search is case-sensitive — try flox search --all
File conflicts between packages: Add priority to the package that should win
Hook failures: Use return not exit; guard with ${FLOX_ENV_CACHE:-}
Stale dependencies: Delete the $FLOX_ENV_CACHE/.deps_installed flag file

Related Skills

The following skills are available as part of the Flox Claude Code plugin for deeper integration:

flox-services — Service management, database setup, background processes
flox-builds — Reproducible builds and packaging with Flox
flox-containers — Create Docker/OCI containers from Flox environments
flox-sharing — Environment composition, remote environments, team patterns
flox-cuda — CUDA and GPU development environments

Learn more and install at flox.dev/docs

사용 방법

시작 전 확인

Flox Environments

When to Activate

Core Concepts

Essential Commands

Manifest Structure

Package Installation Patterns

Basic Installation

Version Pinning

Platform-Specific Packages

Resolving Package Conflicts

Language-Specific Recipes

Python with uv

Node.js

Rust

Go

C/C++

Hooks and Profile

Hooks — Non-Interactive Setup

Profile — Interactive Shell Configuration

Anti-Patterns

Absolute Paths

Using exit in Hooks

Storing Secrets in Manifest

Slow Hooks Without Idempotency Guards

Putting User Commands in Hooks

Full-Stack Example

Environment Sharing

AI-Assisted and Vibe Coding

Debugging

Related Skills

관련 작업

더 많은 Skills

video-editing

kotlin-coroutines-flows

docker-patterns

benchmark

flox-environments

사용 방법

시작 전 확인

Flox Environments

When to Activate

Core Concepts

Essential Commands

Manifest Structure

Package Installation Patterns

Basic Installation

Version Pinning

Platform-Specific Packages

Resolving Package Conflicts

Language-Specific Recipes

Python with uv

Node.js

Rust

Go

C/C++

Hooks and Profile

Hooks — Non-Interactive Setup

Profile — Interactive Shell Configuration

Anti-Patterns

Absolute Paths

Using exit in Hooks

Storing Secrets in Manifest

Slow Hooks Without Idempotency Guards

Putting User Commands in Hooks

Full-Stack Example

Environment Sharing

AI-Assisted and Vibe Coding

Debugging

Related Skills

관련 작업

devcontainers-nix

user-management

uv-package-manager

bootstrap-v6-install

더 많은 Skills

video-editing

kotlin-coroutines-flows

docker-patterns

benchmark