MastraAI•3mo ago

Thread id issue

i'm new to this but have frontend calling mastra server agents and trying to use thread creation feature. using cursor and after quite a few tries (upgrading to newer version of mastra) was prompted to raise a bug. Mastra Memory Thread Creation issue Summary: When sending a message with only resourceId (no threadId) to agent.generate() with memory enabled, Mastra throws: A resourceId must be provided when passing a threadId and using Memory. Reproduction Steps: Use the latest Mastra packages (@mastra/core, @mastra/memory, etc.). Configure an agent with memory and generateTitle: true. Send a message with only resourceId (no threadId) to the agent’s generate() method. Observe the error. Payload: { "messages": [{ "role": "user", "content": "How hot is it in Sydney right now?" }], "resourceId": "user_test123" } Mastra generate options: { resourceId: 'user_test123' } ERROR [2025-07-25 10:48:49.401 +1000] (Mastra): {"message":"A resourceId must be provided when passing a threadId and using Memory. Saw threadId undefined but resourceId is user_test123","details":{"message":"A resourceId must be provided when passing a threadId and using Memory. Saw threadId undefined but resourceId is user_test123","domain":"AGENT","category":"USER","details":{"agentName":"Weather Agent","threadId":"","resourceId":"user_test123"}},"code":"AGENT_MEMORY_MISSING_RESOURCE_ID"} Error in /api/chat: Error: A resourceId must be provided when passing a threadId and using Memory. Saw threadId undefined but resourceId is user_test123 at async POST (src/app/api/chat/route.ts:26:19) 24 | 25 | // Generate response using Mastra with memory

26 | const result = await agent.generate(messages, options);

| ^ 27 |
28 | return Response.json(result); 29 | } catch (error) { { id: 'AGENT_MEMORY_MISSING_RESOURCE_ID', Expected behavior: A new thread should be created and a title generated automatically. Mastra version: @mastra/core: 0.11.1

4 Replies

_roamin_•3mo ago

The error message is misleading here, you actually need to provide both the threadId and the resourceId 😉 (opened a PR to fix the error message: https://github.com/mastra-ai/mastra/pull/6295)

ziksa13OP•3mo ago

Thank you! is there a sample request/code in the github that shows this ?

_roamin_•3mo ago

You can use it like this:

const threadId = "thread_" + Date.now();
const resourceId = "user_123";

const response = await agent.generate(
  [
    {
      role: "user",
      content: "Hi!",
    },
  ],
  {
    threadId,
    resourceId,
  }
);

const threadId = "thread_" + Date.now();
const resourceId = "user_123";

const response = await agent.generate(
  [
    {
      role: "user",
      content: "Hi!",
    },
  ],
  {
    threadId,
    resourceId,
  }
);

Ward•3mo ago

Thank you @Romain , merged the pr will go out on tuesday in the latest and will create an alpha today.

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Thread id issue

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