MastraAI

The TypeScript Agent FrameworkFrom the team that brought you Gatsby: prototype and productionize AI features with a modern JavaScript stack.

MastraAI

The TypeScript Agent FrameworkFrom the team that brought you Gatsby: prototype and productionize AI features with a modern JavaScript stack.

10/5/2025

How to achieve LLM structured output in Mastra ai-sdk compatible streaming.

https://ai-sdk.dev/docs/ai-sdk-ui/streaming-data#streaming-data-from-the-server I want to pass the structured in response to useChat along with streaming output. Even though mastra agent call generates the right structured output, but only content key is streaming to client side. even though .getFullOutput().response has the messages along with ``` messages: [ [Object] ],...

Sebastian Wakefield

10/4/2025

Tools getting called sequentially

I've noticed that sometimes our tools are getting called sequentially when running an agent inside a workflow step, and I'm unsure why this is. We're really trying to cut down on latency and this is a big blocker. In the cases where we run tools sequentially, in our datadog traces, I see multiple workflow.agentic-loop.step.executionWorkflow with each calling a tool (see screenshot). In cases where the same agent runs the tools in parallel, I see a single workflow.agentic-loop.step.executionWorkflow that calls multiple tools (workflow.executionWorkflow.step.toolCallStep). I was hoping there was a flag I could set to force parallel tool calls within my workflow step. I know maxSteps is an option on an agent, but it defaults to 1 anyways so that probably isn't it. Any advice here would be amazing!...

Atiq

10/4/2025

Stream order issue in nested agent via tool call

``` execute: async ({ context, runtimeContext }) => { const messageId = runtimeContext.get("messageId") as NewChatRuntimeContext["messageId"]; const stream = await SandboxAgent.stream( [...

Guria

10/4/2025

Playground incorrect rendering for workflow execution

There are 2 major issues with rendering workflow execution that I am facing. All .map() step calls are rendered as mapping_undefined. If workflow has several mapping steps they render same execution state at the same time. Let's imagine I have workflow: ``` workflow...

Guria

10/4/2025

Playground mastra 0.14.1-alpha.0 resets the state of agent page every time I switch back to it

Whenever I switch between tabs in my browser and return back to mastra playground it resets the state of the agent. ``` "dependencies": { "@ai-sdk/amazon-bedrock": "^3.0.30",...

hayata-yamamoto

10/4/2025

I'm not sure auth, middleware and input/output processors difference

hi, team! I'm bit curious about auth feature. https://mastra.ai/ja/docs/auth do you have some plan to provide a user guilde or customizable auth class like input/output processors? now, i know mastra provides some auth providers feature via auth package and some more providers are being added. In some senario, I should create another auth feature like aws cognito, microsoft something, next-auth etc. Roughly speaking, we have to add jwt token verification or cookie decryption to verify whether api requester has the right to access our service or not, and additionally add runtime context by using jwt token claim information like custom attributes or something. ...

Sebastian Wakefield

10/4/2025

Duplicate responses coming from Mastra

I sometimes notice my streamVNext agent outputting two text outputs on the same run. I have verified this by confirming that two text-start chunk types get sent in the stream with the same runId but different message IDs. For context, I'm on the latest mastra version. Is there any flag I can set on streamVNext so this doesn't happen? Or is it completely up to the model provider and Mastra has no control here? Please let me know, as I'm currently manually filtering out the rest of the stream after I detect the first text-start....

Raid55

10/4/2025

`.dowhile` and `.dountil` `runCount` is stuck at `-1`

I don't know why this is a thing but it is. How long has this been broken for? or is this a recent regression? Is this a known issue? also dowhile and dountil are the same function, just reverse the true to false, vice versa, why have 2? I was under the impression that dowhile ran its condition check before the loop whereas dountil ran its check after the loop, im that case it would warrant seperate functions. ```typescript...

Ville

10/3/2025

"Internal agent did not generate structured output"

I am getting: ``` [StructuredOutputProcessor] Structuring failed: Internal agent did not generate structured output [StructuredOutputProcessor] Structured output processing failed: [StructuredOutputProcessor] Structuring failed: Internal agent did not generate structured output...

Agrit Tiwari

10/3/2025

Better errors please!!

Hey guys, Can we better errors in mastra!! Though we are novice to webstreams, but can work on the information in errors. But this does not help me at all. ```ERROR [2025-10-03 21:10:37.593 +0530] (Mastra): Error in agent stream runId: "1a6b58be-52d0-4c76-b3d4-a1708f1d69d8"...

Zack

10/3/2025

Removing the expected functionality for generate broke my workflow

I'm curious why generate is now just the lightest weight wrapper around stream (https://github.com/mastra-ai/mastra/blob/01605282391c6be2c570f9fdcc808e2b063806cd/packages/core/src/agent/agent.ts#L3307). This feels like an opinionated choice, but it was both not made transparent that when you use generate you are now actually using stream (which ended up breaking our workflow) and not justified as to why this opinion is held. By using the function call generate one would expect a different underl...

altab

10/3/2025

Mastra x assistant-ui : documentation differs, error during integration

Hello, Mastra doc on assistant-ui integration and assistant-ui one are different https://mastra.ai/en/docs/frameworks/agentic-uis/assistant-ui https://www.assistant-ui.com/docs/runtimes/mastra/separate-server-integration...

Ferreo

10/2/2025

Langfuse tracing not working

I'm getting errors from the langfuse SDK when trying to enable the langfuse tracing: [Langfuse SDK] Unknown error: SyntaxError: Failed to parse JSON at json (null) at processTicksAndRejections (null)...

Raid55

10/2/2025

Updated to Mastra 0.19 everything breaks

This is starting to feel like a reoccuring pattern. I am avoiding updating mastra now because every-time a new release is pushed it feels like it is not tested, and it introduces new issues that break our existing workflows. There is no context here, this is just the output we are getting. Worked fine in 0.16.0, and now its broken. Version 0.17.0 and 0.18.0 were also broken so we omited updating to thoes versions, but now we are missing out on core features because they get added in future versions, that have regressive behaviors. ```...

Adnan A.

10/2/2025

'C:\Program' is not recognized as an internal or external command

I’m running into an error when starting my dev server.

npm run dev

mastra dev

...

Ghassen

10/2/2025

Mastra dev server fails to start after new update

◐ Preparing development environment... ✓ Initial bundle complete ◇ Starting Mastra dev server... 'C:\Program' is not recognized as an internal or external command, operable program or batch file....

dashan108

10/2/2025

mastra is not retrieving `waitForEvent` workflow snapshots

I have following scenario: 1. Workflow is paused with waitForEvent ; a new record appears in DB table mastra_workflow_snapshot , that is good. 2. then I restart mastra server and send sendEvent with the runId from that record. But receive error: "Workflow run not found". ...

flippyhead

10/1/2025

Error in streamVNext generate: Unknown error

I have a mastra cloud instance that is giving this cryptic error. Locally everything works. Not sure how to debug..

mewtwo

10/1/2025

Error write EPIPE on brand new repo

hey @Ward, I'm trying to start a brand new repo with today's release of mastra 0.19.1 (clean postgres, no tools, no workflow, 1 example agent only) and this error is showing before the local server starts: ```◇ Starting Mastra dev server... node:events:496 throw er; // Unhandled 'error' event ^...

Raha

10/1/2025

Duplicate Requests from Mastra Agent Causing Gateway Timeout

Hi everyone, I’m encountering an issue with the Mastra agent where it seems to attempt regenerating messages multiple times, resulting in 2–3 identical requests for the same output. This is causing a Gateway Timeout error (504) in my application. Here’s a snippet of the error:...

Previous Next

Gaming

Programming

MastraAI

The TypeScript Agent FrameworkFrom the team that brought you Gatsby: prototype and productionize AI features with a modern JavaScript stack.

MastraAI

The TypeScript Agent FrameworkFrom the team that brought you Gatsby: prototype and productionize AI features with a modern JavaScript stack.