Cairo L1 L2 Messaging

Explain Starknet L1 and L2 messaging, l1_handler functions, and message syscalls; use when a request involves cross layer messaging in Cairo.

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Cairo L1-L2 Messaging

Overview

Explain how messages flow between L1 and L2 and the contract patterns to send and receive them.

Quick Use

  • Read references/l1-l2-messaging.md before answering.
  • Use #[l1_handler] for L1 to L2 messages.
  • Use send_message_to_l1_syscall for L2 to L1 messages.

Response Checklist

  • Verify the L1 sender in l1_handler entry points.
  • Remember that L2 to L1 messages must be consumed on L1.
  • Use felt252 arrays for payloads.

Example Requests

  • "How do I receive an L1 message in Cairo?"
  • "How do I send a message to L1 from a contract?"
  • "What is the Starknet messaging contract on L1?"

teddyjfpender/skill-issues/tree/main/skills/cairo-l1-l2-messaging commit b4867fce42

Frequently asked questions

npx skillmds@latest add teddyjfpender/cairo-l1-l2-messaging