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---
name: installing-dependencies
description: Use before installing dependencies, packages, or tools required for building project.
---
# Installing Dependencies
## The Golden Rule
**If the install command writes anything outside the current project directory, stop and ask the user for permission first.**
This is non-negotiable. No exceptions.
## Decision Gate
Before running any install command, ask:
```
Does this command write outside the project directory?
YES -> Ask user for permission. Do not proceed until granted.
NO -> Proceed.
Is there no virtual environment / local package setup yet?
YES -> Initialize one first, then install.
NO -> Install into the existing local environment.
```
## Per-Ecosystem Rules
### Python
```
# Initialize venv if not present
uv venv # preferred
python -m venv .venv
# Install into venv
uv add <pkg>
uv pip install <pkg>
.venv/bin/pip install <pkg>
```
```
# NEVER without permission
pip install <pkg> # writes to system Python
pip install --user <pkg> # writes to ~/.local
```
### Node.js
```
# Install locally (default behavior)
npm install <pkg>
npm install --save-dev <pkg>
bun add <pkg>
bun add -d <pkg>
```
```
# NEVER without permission
npm install -g <pkg> # writes to system node_modules
bun add -g <pkg>
```
### Rust
```
# Add as project dependency
cargo add <pkg>
```
```
# NEVER without permission
cargo install <pkg> # writes to ~/.cargo/bin
```
### System / OS-level tools
```
# NEVER without permission
sudo apt install <pkg>
brew install <pkg>
pip install <pkg> # system pip
```
System-level tools (runtimes, compilers, CLI utilities) always require explicit user permission. If a required tool is missing, inform the user and ask them to install it rather than installing it yourself.
## What "Outside the Project Directory" Means
Any path that is not under the current working project folder, including:
- `~/.local`
- `~/.cargo`
- `/usr/local`
- `/usr/lib`
- Global `node_modules`
- System Python site-packages
## Asking for Permission
State clearly:
1. What you want to install
2. Where it will be written
3. Why it is needed
Wait for explicit approval before proceeding.
