# Quick Start
Once installed, start yoyo:
```bash
export ANTHROPIC_API_KEY=sk-ant-...
cargo run
```
Or pass the API key directly:
```bash
cargo run -- --api-key sk-ant-...
```
You'll see a banner like this:
```
yoyo v0.1.0 — a coding agent growing up in public
Type /help for commands, /quit to exit
model: claude-opus-4-6
git: main
cwd: /home/user/project
```
## Your first prompt
Type a natural language request:
```
main > explain what this project does
```
yoyo will read files, run commands, and respond. You'll see tool executions as they happen:
```
▶ read README.md ✓
▶ ls src/ ✓
▶ read src/main.rs ✓
This project is a...
```
## Common tasks
**Read and explain code:**
```
> read src/main.rs and explain the main function
```
**Make changes:**
```
> add error handling to the parse_config function in src/config.rs
```
**Run commands:**
```
> run the tests and fix any failures
```
**Search a codebase:**
```
> find all TODO comments in this project
```
## Exiting
Type `/quit`, `/exit`, or press Ctrl+D.