deps-install

When to Use This Skill

Use this skill when...	Use justfile-expert instead when...
Installing packages without picking a manager up front	Defining a project-local just install recipe
One-off --global or --dev installs across mixed projects	Standardising just deps / just sync for a team
Auto-detecting between uv, bun, npm, cargo, and go	The repo already exposes installation as a recipe

Use this skill when...	Use shell-expert instead when...
The user just wants the install command run	Writing a custom installer script with retries or branching
Syncing the lockfile via the right native subcommand	Composing multi-package-manager bootstrap logic in shell

Context

• Package files: !find . -maxdepth 1 \( -name "package.json" -o -name "pyproject.toml" -o -name "requirements.txt" -o -name "Cargo.toml" -o -name "go.mod" -o -name "Gemfile" \) -type f
• Lock files: !find . -maxdepth 1 \( -name "uv.lock" -o -name "package-lock.json" -o -name "yarn.lock" -o -name "pnpm-lock.yaml" -o -name "Cargo.lock" -o -name "go.sum" \) -type f

Parameters

• $1: Package names to install (space-separated or "all" to install from manifest)
• $2: --dev flag for development dependencies
• $3: --global flag for global installation

Installation Execution

Python (uv)

{{ if PACKAGE_MANAGER == "uv" }} Install Python packages with uv:

• Install all: uv sync
• Add package: uv add $1
• Add dev dependency: uv add --dev $1
• Install from requirements: uv pip install -r requirements.txt {{ endif }}

Node.js (Bun)

{{ if PACKAGE_MANAGER == "bun" }} Install Node packages with Bun:

• Install all: bun install
• Add package: bun add $1
• Add dev dependency: bun add -d $1
• Global install: bun add -g $1 {{ endif }}

Node.js (npm)

{{ if PACKAGE_MANAGER == "npm" }} Install Node packages with npm:

• Install all: npm ci (if lock exists) or npm install
• Add package: npm install $1
• Add dev dependency: npm install -D $1
• Global install: npm install -g $1 {{ endif }}

Node.js (Yarn)

{{ if PACKAGE_MANAGER == "yarn" }} Install Node packages with Yarn:

• Install all: yarn install --frozen-lockfile
• Add package: yarn add $1
• Add dev dependency: yarn add -D $1
• Global install: yarn global add $1 {{ endif }}

Node.js (pnpm)

{{ if PACKAGE_MANAGER == "pnpm" }} Install Node packages with pnpm:

• Install all: pnpm install --frozen-lockfile
• Add package: pnpm add $1
• Add dev dependency: pnpm add -D $1
• Global install: pnpm add -g $1 {{ endif }}

Rust (Cargo)

{{ if PACKAGE_MANAGER == "cargo" }} Install Rust packages with Cargo:

• Build dependencies: cargo build
• Add dependency: Edit Cargo.toml then cargo build
• Install binary: cargo install $1 {{ endif }}

Go

{{ if PACKAGE_MANAGER == "go" }} Install Go packages:

• Download modules: go mod download
• Add dependency: go get $1
• Install tool: go install $1@latest {{ endif }}

System Dependencies

Check for system-level dependencies:

• macOS: Use Homebrew if Brewfile exists
• Linux: Detect package manager (apt, yum, dnf, pacman)

Lock File Management

After installation:

1. Verify lock file is updated
2. If new lock file created, remind to commit it
3. Check for security vulnerabilities

Post-install Actions

1. Display installed packages and versions
2. Run /lint:check to ensure code quality
3. Run /test:run to verify nothing broke
4. Suggest /git:smartcommit if lock files changed