> That last one took a bit of time, we went down the ESM/CJS bundling rabbithole, ran into lots of monorepo issues, and ultimately opted for a more explicit approach.
shudders in vietnam war flashbacks congrats on launch guys!!!
for those who want an independent third party endorsement, here's Brex CTO talking about Mastra in their AI engineering stack http://latent.space/p/brex
I worked with Mastra for three months and it is awesome. Thank you for making a great product.
One thing to consider is that it felt clunky working with workflows and branching logic with non LLM agents. I have a strong preference for using rules based logic and heuristics first. That way, if I do need to bring in the big gun LLM models, I already have the context engineering solved. To me, an agent means anything with agency. After a couple weeks of frustration, I started using my own custom branching workflows.
One reason to use rules, they are free and 10,000x faster, with an LLM agent fallback if validation rules were not passing. Instead of running an LLM agent to solve a problem every single time, I can have the LLM write the rules once. The whole thing got messy.
Otherwise, Mastra is best in class for working with TypeScript.
Re: Tanstack AI, really depends on adoption. We've known Tanner since his react-static days and if it takes off we'll def work together.
Re: Mastra cloud -- this is basically hosted services, eg observability, hosted studio, hosted serverless deployments, as distinct from the framework.
With server adapters you can now deploy your studio in your infra. We're going to pull multi-project / multi-user Mastra cloud features into a Mastra admin feature so you can run these locally or deploy them on your infra as well (with EE licensing for stuff like RBAC). Stay tuned here.
Ran through quickstart, created my first agent "Friendo" that acts as my best friend, chatted a bit. Nice UI, cool systems, hope to play with it more and build something, but I'm just not sure what yet.
I've been building with Mastra for a couple of weeks now and loving it, so congratulations on reaching 1.0!
It's built on top of Vercel AI elements/SDK and it seems to me that was a good decision.
My mental heuristic is:
Vercel AI SDK = library, low level
Mastra = framework
Then Vercel AI Elements gives you an optional pre built UI.
However, I read the blog post for the upcoming AI SDK 6.0 release last week, and it seems like it's shifting more towards being a framework as well. What are your thoughts on this? Are these two tools going to align further in the future?
Have a ton of respect for the AI SDK team. Initially we only used AI SDK model routing, but now we also have our own built-in model routing as well.
I see each of us having different architectures. AI SDK is more low-level, and Mastra is more integrated with storage powering our studio, evals, memory, workflow suspend/resume etc.
Congratulations! I’m a fan of the publicity work and general out-of-the-box DX! That stuff matters a lot and I’m happy you’re aware.
I wonder: Are there any large general purpose agent harnesses developed using Mastra? From what I can tell OpenCode chose not to use it.
A lot of people on here repeat that rolling your own is more powerful than using Langchain or other frameworks and I wonder how Mastra relates to this sentiment.
When Langchain was the only option rolling your own made a lot of sense!
These days we see things going the other way, where teams that started rolling their own shift over to Mastra so they can focus on the agent vs having to maintain an internal framework.
The Latent Space article swyx linked earlier includes a quote from the Brex CTO talking about how they did that.
You should use whatever framework you feel like has the best DX / fits your stack best!
We're TypeScript-first, TypeScript-only so a lot of the teams who use us are full-stack TypeScript devs and want an agent framework that feels TS-native, easy to use, and feature-complete.
Language, although an important factor, should not be the only factor to decide using a tool. I'm curious is there something unique Mastra is bringing to the table, compared to other alternatives.
If I had some heartfelt advice for the Mastra devrel team it would be to shut up about about Gatsby.
I'm a happy Mastra user and I'm biased to their success. But I think linking it to an unrelated project is only going to matter to non-technical CXOs who choose technology based on names not merits. And that's not the audience Mastra needs to appeal to to be successful. Good dev tools and techs trickle from the bottom up in engineering organizations.
Thanks for the feedback. We hear from a lot of devs with fond memories of Gatsby but if it cuts the opposite way for you that's also fair!
Most of us spent a lot of the last decade building Gatsby so it's sort of a personal identity/pride thing for us more than a marketing thing. But maybe we need to keep our identity small! Either way, thanks for saying something, worth thinking about.
From punch cards to assembly, to C, to modern languages and web frameworks, each generation raised the abstraction. Agentic frameworks are the next one.
We've always supported letting folks specify their agent hierarchy, eg agent supervisor, workflow orchestrator, mix and match, etc.
But people kept asking us for a multi-agent primitive out of the box so we shipped `agent.network()`, which is basically dynamic hierarchy decided at runtime, pass in an array of workflows and agents to the routing agent and let it decide what to do, how long to execute for, etc!
You’re not locked into a model, but you likely are locked in to a platform. This DX and convenience just shifts within the stack where the lock in occurs. Not criticizing - just a choice people should be conscious of.
Another useful question to ask: since you’re likely using 1 of 3 frontier models anyway, do you believe Claude Agent SDK will increasingly become the workflow and runtime of agentic work? Or if not Claude itself, will that set the pattern for how the work is executed? If you do, why use a wrapper?
Re: lessons from coding agents, we're building some of the key abstractions like sandboxes, filesystem, skills/knowledge as Mastra primitives in over the next month.
For any agent you're shipped to production though you probably want a harness that's open-source so you more fully control / can customize the experience.
I think that’s fair, totally, but I also think a Skill would be considered a primitive in and of itself by Anthropic. So to me it’s still wrapping an open primitive. Anyway, trade offs.
Offtopic but how much is AI used these days for generating code at your place? Curious because we see a major shift last months where almost everything is generated. Still human checked and human quality gates. Big difference compared to last year.
There's the normal stuff you'd expect -- we're all Opus-pilled, use Claude Code, a PR review bot etc. But it's been especially helpful with highly templatized code like our storage adapters, we already have 10-15 working examples which makes the n+1st adapter almost trivial to write.
So the ultimate real life use case of this is having a bubble on your site that you click to chat with a bot?! Most users prefer to chat with an actual human being 99% of the times or immediately ask the bot to chat with one.
Less frequently sites and more frequently a SaaS app, for example Sanity released a content agent in their CMS, Factorial released an agent inside their HR/payroll product.
But tons of other use cases too, eg dev teams at Workday and PayPal have built an agentic SRE to triage their alerts, etc etc
shudders in vietnam war flashbacks congrats on launch guys!!!
for those who want an independent third party endorsement, here's Brex CTO talking about Mastra in their AI engineering stack http://latent.space/p/brex
One thing to consider is that it felt clunky working with workflows and branching logic with non LLM agents. I have a strong preference for using rules based logic and heuristics first. That way, if I do need to bring in the big gun LLM models, I already have the context engineering solved. To me, an agent means anything with agency. After a couple weeks of frustration, I started using my own custom branching workflows.
One reason to use rules, they are free and 10,000x faster, with an LLM agent fallback if validation rules were not passing. Instead of running an LLM agent to solve a problem every single time, I can have the LLM write the rules once. The whole thing got messy.
Otherwise, Mastra is best in class for working with TypeScript.
Do you have code snippets you can share about how you wanted to write the rules? Want to understand desired grammar / syntax better.
- How do you compare Mastra with Tanstack AI? And/or do you plan to build on top of Tanstack AI like the Vercel AI SDK?
- Since there's a Mastra cloud, do you have an idea as to what features will be exclusive to the hosted version?
Re: Mastra cloud -- this is basically hosted services, eg observability, hosted studio, hosted serverless deployments, as distinct from the framework.
With server adapters you can now deploy your studio in your infra. We're going to pull multi-project / multi-user Mastra cloud features into a Mastra admin feature so you can run these locally or deploy them on your infra as well (with EE licensing for stuff like RBAC). Stay tuned here.
It's built on top of Vercel AI elements/SDK and it seems to me that was a good decision.
My mental heuristic is:
Vercel AI SDK = library, low level
Mastra = framework
Then Vercel AI Elements gives you an optional pre built UI.
However, I read the blog post for the upcoming AI SDK 6.0 release last week, and it seems like it's shifting more towards being a framework as well. What are your thoughts on this? Are these two tools going to align further in the future?
https://vercel.com/blog/ai-sdk-6
I see each of us having different architectures. AI SDK is more low-level, and Mastra is more integrated with storage powering our studio, evals, memory, workflow suspend/resume etc.
I wonder: Are there any large general purpose agent harnesses developed using Mastra? From what I can tell OpenCode chose not to use it.
A lot of people on here repeat that rolling your own is more powerful than using Langchain or other frameworks and I wonder how Mastra relates to this sentiment.
These days we see things going the other way, where teams that started rolling their own shift over to Mastra so they can focus on the agent vs having to maintain an internal framework.
The Latent Space article swyx linked earlier includes a quote from the Brex CTO talking about how they did that.
[1]: https://strandsagents.com
[2]: https://spring.io/projects/spring-ai
We're TypeScript-first, TypeScript-only so a lot of the teams who use us are full-stack TypeScript devs and want an agent framework that feels TS-native, easy to use, and feature-complete.
I'm a happy Mastra user and I'm biased to their success. But I think linking it to an unrelated project is only going to matter to non-technical CXOs who choose technology based on names not merits. And that's not the audience Mastra needs to appeal to to be successful. Good dev tools and techs trickle from the bottom up in engineering organizations.
Most of us spent a lot of the last decade building Gatsby so it's sort of a personal identity/pride thing for us more than a marketing thing. But maybe we need to keep our identity small! Either way, thanks for saying something, worth thinking about.
say more pls?
But people kept asking us for a multi-agent primitive out of the box so we shipped `agent.network()`, which is basically dynamic hierarchy decided at runtime, pass in an array of workflows and agents to the routing agent and let it decide what to do, how long to execute for, etc!
https://mastra.ai/docs/agents/networks
Another useful question to ask: since you’re likely using 1 of 3 frontier models anyway, do you believe Claude Agent SDK will increasingly become the workflow and runtime of agentic work? Or if not Claude itself, will that set the pattern for how the work is executed? If you do, why use a wrapper?
For any agent you're shipped to production though you probably want a harness that's open-source so you more fully control / can customize the experience.
You can take a look at the cloud platform at cloud.mastra.ai, it's in beta currently
It's the same play we did at Gatsby to get to several million in ARR in a couple of years
But tons of other use cases too, eg dev teams at Workday and PayPal have built an agentic SRE to triage their alerts, etc etc