Memory.createThread()

The .createThread() method creates a new conversation thread in the memory system. Each thread represents a distinct conversation or context and can contain multiple messages.

Usage Example

await memory?.createThread({ resourceId: "user-123" });

Parameters

resourceId:

string

Identifier for the resource this thread belongs to (e.g., user ID, project ID)

threadId?:

string

Optional custom ID for the thread. If not provided, one will be generated.

title?:

string

Optional title for the thread

metadata?:

Record<string, unknown>

Optional metadata to associate with the thread

Returns

id:

string

Unique identifier of the created thread

resourceId:

string

Resource ID associated with the thread

title:

string

Title of the thread (if provided)

createdAt:

Date

Timestamp when the thread was created

updatedAt:

Date

Timestamp when the thread was last updated

metadata:

Record<string, unknown>

Additional metadata associated with the thread

Extended usage example

src/test-memory.ts

import { mastra } from "./mastra";

const agent = mastra.getAgent("agent");
const memory = await agent.getMemory();

const thread = await memory?.createThread({
  resourceId: "user-123",
  title: "Memory Test Thread",
  metadata: {
    source: "test-script",
    purpose: "memory-testing",
  },
});

const response = await agent.generate("message for agent", {
  memory: {
    thread: thread!.id,
    resource: thread!.resourceId,
  },
});

console.log(response.text);

Related

• Memory Class Reference
• Getting Started with Memory (Covers threads concept)
• getThreadById
• getThreadsByResourceId
• query