Important: This guide covers advanced breaking changes for evaluators, services, and runtime methods. Read the main migration guide first for actions, providers, and basic migrations.

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Table of Contents

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Evaluators Migration

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Evaluator Interface Changes

Evaluators remain largely unchanged in their core structure, but their integration with the runtime has evolved: 
// v0 Evaluator usage remains the same
export interface Evaluator {
  alwaysRun?: boolean;
  description: string;
  similes: string[];
  examples: EvaluationExample[];
  handler: Handler;
  name: string;
  validate: Validator;
}

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Key Changes:

  1. Evaluation Results: The evaluate() method now returns Evaluator[] instead of string[]:
// v0: Returns string array of evaluator names
const evaluators: string[] = await runtime.evaluate(message, state);

// v1: Returns Evaluator objects
const evaluators: Evaluator[] | null = await runtime.evaluate(message, state);
  1. Additional Parameters: The evaluate method accepts new optional parameters:
// v1: Extended evaluate signature
await runtime.evaluate(
    message: Memory,
    state?: State,
    didRespond?: boolean,
    callback?: HandlerCallback,
    responses?: Memory[]  // NEW: Can pass responses for evaluation
);

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Services & Clients Migration

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Service Registration Changes

Services have undergone significant architectural changes: 
// v0: Service extends abstract Service class
export abstract class Service {
  static get serviceType(): ServiceType {
    throw new Error('Service must implement static serviceType getter');
  }

  public static getInstance<T extends Service>(): T {
    // Singleton pattern
  }

  abstract initialize(runtime: IAgentRuntime): Promise<void>;
}

// v1: Service is now a class with static properties
export class Service {
  static serviceType: ServiceTypeName;

  async initialize(runtime: IAgentRuntime): Promise<void> {
    // Implementation
  }
}

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Migration Steps:

  1. Remove Singleton Pattern:
// v0: Singleton getInstance
class MyService extends Service {
  private static instance: MyService | null = null;

  public static getInstance(): MyService {
    if (!this.instance) {
      this.instance = new MyService();
    }
    return this.instance;
  }
}

// v1: Direct instantiation
class MyService extends Service {
  static serviceType = ServiceTypeName.MY_SERVICE;
  // No getInstance needed
}
  1. Update Service Registration:
// v0: Register instance
await runtime.registerService(MyService.getInstance());

// v1: Register class
await runtime.registerService(MyService);
  1. Service Type Enum Changes:
// v0: ServiceType enum
export enum ServiceType {
  IMAGE_DESCRIPTION = 'image_description',
  TRANSCRIPTION = 'transcription',
  // ...
}

// v1: ServiceTypeName (similar but may have new values)
export enum ServiceTypeName {
  IMAGE_DESCRIPTION = 'image_description',
  TRANSCRIPTION = 'transcription',
  // Check for any renamed or new service types
}

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Runtime Method Changes

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1. State Management

The updateRecentMessageState method has been removed: 
// v0: Separate method for updating state
currentState = await runtime.updateRecentMessageState(currentState);

// v1: Use composeState with specific keys
currentState = await runtime.composeState(message, ['RECENT_MESSAGES']);

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2. Memory Manager Access

Memory managers are no longer directly accessible: 
// v0: Direct access to memory managers
runtime.messageManager.getMemories({...});
runtime.registerMemoryManager(manager);
const manager = runtime.getMemoryManager("messages");

// v1: Use database adapter methods
await runtime.getMemories({
    roomId,
    count,
    unique: false,
    tableName: "messages",
    agentId: runtime.agentId
});

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3. Model Usage

Complete overhaul of model interaction: 
// v0: generateText with ModelClass
import { generateText, ModelClass } from '@elizaos/core';

const result = await generateText({
  runtime,
  context: prompt,
  modelClass: ModelClass.SMALL,
});

// v1: useModel with ModelTypeName
const result = await runtime.useModel(ModelTypeName.TEXT_SMALL, {
  prompt,
  stopSequences: [],
});

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4. Settings Management

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Global Settings Object Removed

The global settings object is no longer exported from @elizaos/core: 
// v0: Import and use global settings
import { settings } from '@elizaos/core';

const charityAddress = settings[networkKey];
const apiKey = settings.OPENAI_API_KEY;

// v1: Use runtime.getSetting()
// Remove the settings import
import { elizaLogger, type IAgentRuntime } from '@elizaos/core';

const charityAddress = runtime.getSetting(networkKey);
const apiKey = runtime.getSetting('OPENAI_API_KEY');

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New Settings Methods

// v0: Only getSetting through runtime
const value = runtime.getSetting(key);

// v1: Both get and set
const value = runtime.getSetting(key);
runtime.setSetting(key, value, isSecret);

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Migration Example

// v0: utils.ts using global settings
import { settings } from '@elizaos/core';

export function getCharityAddress(network: string): string | null {
  const networkKey = `CHARITY_ADDRESS_${network.toUpperCase()}`;
  const charityAddress = settings[networkKey];
  return charityAddress;
}

// v1: Pass runtime to access settings
export function getCharityAddress(runtime: IAgentRuntime, network: string): string | null {
  const networkKey = `CHARITY_ADDRESS_${network.toUpperCase()}`;
  const charityAddress = runtime.getSetting(networkKey);
  return charityAddress;
}

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Common Settings Migration Patterns

  1. Environment Variables: Both v0 and v1 read from environment variables, but access patterns differ
  2. Dynamic Settings: v1 allows runtime setting updates with setSetting()
  3. Secret Management: v1 adds explicit secret handling with the isSecret parameter

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Real-World Fix: Coinbase Plugin

The Coinbase plugin’s getCharityAddress function needs updating: 
// v0: Current broken code
import { settings } from '@elizaos/core'; // ERROR: 'settings' not exported

export function getCharityAddress(network: string, isCharitable = false): string | null {
  const networkKey = `CHARITY_ADDRESS_${network.toUpperCase()}`;
  const charityAddress = settings[networkKey]; // ERROR: Cannot use settings
  // ...
}

// v1: Fixed code - runtime parameter added
export function getCharityAddress(
  runtime: IAgentRuntime, // Add runtime parameter
  network: string,
  isCharitable = false
): string | null {
  const networkKey = `CHARITY_ADDRESS_${network.toUpperCase()}`;
  const charityAddress = runtime.getSetting(networkKey); // Use runtime.getSetting
  // ...
}

// Update all callers to pass runtime
const charityAddress = getCharityAddress(runtime, network);

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5. Event System

New event-driven architecture: 
// v1: Register and emit events
runtime.registerEvent('custom-event', async (params) => {
  // Handle event
});

await runtime.emitEvent('custom-event', { data: 'value' });

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Entity System Migration

The most significant change is the shift from User/Participant to Entity/Room/World:

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User → Entity

// v0: User-based methods
await runtime.ensureUserExists(userId, userName, name, email, source);
const account = await runtime.getAccountById(userId);

// v1: Entity-based methods
await runtime.ensureConnection({
  entityId: userId,
  roomId,
  userName,
  name,
  worldId,
  source,
});
const entity = await runtime.getEntityById(entityId);

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Participant → Room Membership

// v0: Participant methods
await runtime.ensureParticipantExists(userId, roomId);
await runtime.ensureParticipantInRoom(userId, roomId);

// v1: Simplified room membership
await runtime.ensureParticipantInRoom(entityId, roomId);

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New World Concept

v1 introduces the concept of “worlds” (servers/environments): 
// v1: World management
await runtime.ensureWorldExists({
  id: worldId,
  name: serverName,
  type: 'discord', // or other platform
});

// Get all rooms in a world
const rooms = await runtime.getRooms(worldId);

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Connection Management

// v0: Multiple ensure methods
await runtime.ensureUserExists(...);
await runtime.ensureRoomExists(roomId);
await runtime.ensureParticipantInRoom(...);

// v1: Single connection method
await runtime.ensureConnection({
    entityId,
    roomId,
    worldId,
    userName,
    name,
    source,
    channelId,
    serverId,
    type: 'user',
    metadata: {}
});

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Client Migration

Clients now have a simpler interface: 
// v0: Client with config
export type Client = {
  name: string;
  config?: { [key: string]: any };
  start: (runtime: IAgentRuntime) => Promise<ClientInstance>;
};

// v1: Client integrated with services
// Clients are now typically implemented as services
class MyClient extends Service {
  static serviceType = ServiceTypeName.MY_CLIENT;

  async initialize(runtime: IAgentRuntime): Promise<void> {
    // Start client operations
  }

  async stop(): Promise<void> {
    // Stop client operations
  }
}

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Quick Reference

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Removed Methods

  • updateRecentMessageState() → Use composeState(message, ['RECENT_MESSAGES'])
  • registerMemoryManager() → Not needed, use database adapter
  • getMemoryManager() → Use database adapter methods
  • registerContextProvider() → Use registerProvider()

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Removed Exports

  • settings object → Use runtime.getSetting(key) instead

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Changed Methods

  • evaluate() → Now returns Evaluator[] instead of string[]
  • getAccountById() → getEntityById()
  • ensureUserExists() → ensureConnection()
  • generateText() → runtime.useModel()

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New Methods

  • setSetting()
  • registerEvent()
  • emitEvent()
  • useModel()
  • registerModel()
  • ensureWorldExists()
  • getRooms()

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Migration Checklist

  • Update all evaluator result handling to expect Evaluator[] objects
  • Remove singleton patterns from services
  • Update service registration to pass classes instead of instances
  • Replace updateRecentMessageState with composeState
  • Migrate from generateText to runtime.useModel
  • Update user/participant methods to entity/room methods
  • Add world management for multi-server environments
  • Convert clients to service-based architecture
  • Update any direct memory manager access to use database adapter
  • Replace import { settings } with runtime.getSetting() calls
  • Update functions to accept runtime parameter where settings are needed

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Need Help?

If you encounter issues not covered in this guide:
  1. Check the main migration guide for basic migrations
  2. Review the v1.x examples in the elizaOS repository for reference implementations
  3. Join our Discord community for support