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---
name: cairo-contract-events
description: Explain Starknet contract events, event enums, and emitting events; use when a request involves defining or emitting events in Cairo.
---
# Cairo Contract Events
## Overview
Explain how to define events and emit them from Cairo contracts.
## Quick Use
- Read `references/contract-events.md` before answering.
- Define an `Event` enum with `#[event]` and `#[derive(starknet::Event)]`.
- Mark indexed fields with `#[key]`.
## Response Checklist
- Emit events with `self.emit(Event::Variant(...))`.
- Use struct variants to keep event fields clear and typed.
- Use `#[key]` for fields that should be indexed.
## Example Requests
- "How do I emit an event from a contract?"
- "What does #[key] do on an event field?"
- "How do I define multiple event types?"
