Software engineering is becoming a hierarchy of loops. So today we're launching Mastra Factory: a system for agents to take software from issue into production.
Get started with 𝚗𝚙𝚖 𝚌𝚛𝚎𝚊𝚝𝚎 𝚏𝚊𝚌𝚝𝚘𝚛𝚢:
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Incredibly excited today to launch file-based agents in Mastra!
Add `instructions` as a .md file, a .ts file to `tools/` and the filename becomes the tool name, subagents in `subagents/`:
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We’re excited to ship Durable Agents in Mastra.
Durable Agents don't just write to storage when an agent turn finishes; they persist the stream in real-time using a server cache.
That lets them survive client disconnects, browser refreshes, or network blips:
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I have two cracked cofounders who never quit
@smthomas3 @abhiaiyer
Founders, you can only pick one:
• $250k angel check today
• Intro to your dream VC
• First enterprise customer
• A cracked co-founder who never quits
Today, we're excited to announce the first-party Mastra integration for the Archil file system.
This integration makes it easier than ever to select Archil as the storage for your agents, giving you portability across sandbox providers, branching, and the ability to run serverless Python/Node/Bash on your file system directly.
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I built a harness for gpt5.5 with Mastra that outperformed fable5 on select @terminalbench 2.0 tasks with 92% accuracy by just running it on a loop.
Having built agents for quite sometime now, I can confidently say that Mastra is one of the only real and complete options for any dev migrating/integrating agentic workflows with past exp of JS/TS/web dev/tool/api/platform devs.
They have a complete ecosystem for any dev as an enterprise use case and especially within the personal agent space given generous free tiers.
With this CLI, it’s going to make building and monitoring agents really easy.
Going to share that harness soon:)
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You can now define and attach LLM as Judge Scorers in Mastra Studio
I can see developers using this to quickly iterate on a scorer before promoting it to code
Also handy for non-technical users building with Editor and Agent Builder
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Mastra's Agent Builder just got a lot more powerful with our new Composio integration! 💯
Describe the agent you want, and Agent Builder will equip it with the right tools from Composio’s 1,000+ integrations - so you can create more capable agents without defining every tool up front.
The legend @YujohnNatt himself put together a quick walkthrough:
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When Sam Bhagwat (@calcsam) went through @ycombinator, he and his co-founder joked they were 'the uncs of the batch.'
Both dads. Both with a lot more experience than a 25 year old. Both with enough reps to know exactly what they're building.
Sam's a two-time founder. Built @GatsbyJS (acquired by @Netlify), now building @mastra, a TypeScript framework for AI agents.
Turns out life experience might be the most underrated founder skill.
Is it time for a YC built for experienced operators?
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This has been an absolutely fantastic product. Been using it in production for about a month now and it’s totally changed our team’s work.
Custom harnesses with custom agents and targeted tools are the future
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We may look back at agent harnesses the way we look at web frameworks today: an abstraction that makes an entire new category of applications practical. This is the kind of infrastructure milestone that, in hindsight, signals the start of a new application platform cycle.
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Today we're launching @mastra `Harness`
`Harness` gives you a `Session` with plan/build modes.
It lets you manage thread lifecycle, spawn or fork subagents, approve tools per-call or session, ask user questions, queue/steer.
With skills, sandbox, browser, heartbeat. channels:
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mastra has hit 1 million weekly downloads 📈📈📈
