Yujohn Nattrass

Current: Software Engineer @mastra_ai
Previous: Software Engineer @netlify

[Yujohn Nattrass @YujohnNatt]

Excited to share experiments in @mastra. Create test cases, score the results, and compare runs side by side to see if the changes actually helped. Swap a model, tweak a prompt, run again, and compare.

Do it all in Studio or via the API. 1/5

[Yujohn Nattrass @YujohnNatt]

@DamioJr @mastra @DamioJr I have this PR ready, it should be out for next release: https://t.co/LWQTvBbTUF

[Yujohn Nattrass @YujohnNatt]

Excited to share experiments in @mastra. Create test cases, score the results, and compare runs side by side to see if the changes actually helped. Swap a model, tweak a prompt, run again, and compare.

Do it all in Studio or via the API. 1/5

[Yujohn Nattrass @YujohnNatt]

@DamioJr @mastra Hey @DamioJr I can take a look. Just need a bit more information on how I could repro so I can ensure it will be fixed. I'll send you a DM

[Abhi Aiyer @abhiaiyer]

This started with a question: “Can an agent sell my god damn house in Joshua Tree for me?”

Working backwards from there, we discovered the components needed to realize that mission.

Signals encapsulate many powerful primitives needed for a multiplayer and autonomous agent world.

[Tyler Barnes @tylbar]

🚨We shipped a new context engineering primitive @mastra today, Agent Signals! (alpha)
🔓Unlocks: multiplayer steering, dynamic cacheable system prompts, agent notifications (gh/email/etc), and automatic behavior guidance 🧵

[Sam Bhagwat @calcsam]

We're launching Agent Builder, your internal agent platform:

- Devs write tools, select models, build workflows
- Non-dev teammates assemble into agents (or vibe code), chat, publish
- Includes RBAC, ownership, and visibility controls
- Under the hood everything's Mastra agents

[Mastra @mastra]

🆕 Your coding agent can now build, test, and ship Mastra projects.

Close the loop with the upgraded Mastra CLI.

[Alex Booker @bookercodes]

Stoked to announce Mastra Observability - hosted observability for Mastra agents 🔥

Export high-volume traces and logs

Monitor cost and performance, search and filter every run

Then use Studio to turn production behavior into evals, datasets, and experiments

[Mastra @mastra]

You can now cut costs and reduce latency with cached responses.

With response caching, agents can handle identical requests and pull responses from cache, skipping the LLM call.

[Shane Thomas @smthomas3]

https://t.co/BPkhdkOigs

[Sam Bhagwat @calcsam]

today we're incredibly excited to announce Mastra Observability as a standalone part of the Mastra platform

logs, traces, and metrics for your agents. fully searchable. available across every project and deploy you run.

[Mastra @mastra]

🆕 @mastra/[email protected]
Render interactive HTML UIs with MCP Apps in Mastra Studio .

[Mastra @mastra]

Your agents can now browse and take actions on the web, just like you can.

This lets agents work with sites that don’t have APIs and still complete tasks end to end.

Plus, each interaction is streamed live to Studio.

[Paul @PaulieScanlon]

This week metrics and logs join traces in @mastra Studio.

• Logs: every event, searchable with full context
• Traces: debug any run, end to end
• Metrics: cost, latency, errors, and scores at a glance

With all three pillars of observability in one place, you can now see the whole picture.

[Sam Bhagwat @calcsam]

we just shipped metrics and logs in @mastra studio

[Paul @PaulieScanlon]

🔒 Today we shipped @okta auth for @mastra Studio.

If you're running Studio in production you can now keep it safe using your existing Okta setup.

[Alex Booker @bookercodes]

Today we're launching @mastra remote sandboxes

Give your agent a secure, isolated environment to run untrusted user code... like a vibe coding agent...

[Yujohn Nattrass @YujohnNatt]

Don’t miss Agents Hour with @smthomas3 and @abhiaiyer every Monday, 12–1 pm PT / 3–4 pm ET. Come hang out, chat, and say hi.

https://t.co/Dv00FK16DL

[Yujohn Nattrass @YujohnNatt]

Agents Hour was a blast! I got to nerd out on error analysis and why AI sometimes messes up.

[Yujohn Nattrass @YujohnNatt]

@ay_ushr @mastra thank you!

[Yujohn Nattrass @YujohnNatt]

If you have any suggestions or ideas for improvement, drop a reply or reach out to me or the team. Happy experimenting!

[Yujohn Nattrass @YujohnNatt]

Learn more about Experiments in Mastra Studio in our latest blog post: https://t.co/JqdEaxneB1