Metadata provides information about the currently running actor.

​
Region

Region can be accessed from the context object via c.region.

c.region is only supported on Rivet at the moment.

​
Tags

Tags can be accessed from the context object via c.tags.

For example:

import { actor } from "actor-core";

const chatRoom = actor({
  state: {
    messages: []
  },
  
  actions: {
    // Method used to get the channel ID
    getChannelId: (c) => {
      return c.tags['channel'];
    },
    
    addMessage: (c, message) => {
      // Use the channel for logging or filtering
      const channel = c.tags['channel'] || 'default';
      console.log(`Adding message to channel: ${channel}`);
      
      c.state.messages.push({
        channel,
        message,
        timestamp: Date.now()
      });
      
      c.broadcast('newMessage', { channel, message });
    }
  }
});

export default chatRoom;

​
Actor Name

You can access the actor name with:

const actorName = c.name;

This is useful when you need to know which actor type is running, especially if you have generic utility functions that are shared between different actor implementations.