Daniel Lew

Staff Software Engineer @mastra, previously @netlify @gatsbyjs

[Sam Bhagwat @calcsam]

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:

[Daniel Lew @ShlomesLew]

@smthomas3 ahhh this is the agentic loop i've heard so much about

[Sam Bhagwat @calcsam]

We're excited to introduce Claude Code, Cursor, and Codex agents in Mastra.

Starting today, Mastra is now a meta-harness:

[Sam Bhagwat @calcsam]

mastra has hit 1 million weekly downloads 📈📈📈

[Mastra @mastra]

Python trains, TypeScript ships.

Tickets just dropped for TypeScript AI Conference: London → https://t.co/hwSgNVVAR4

Featuring speakers from @GitHubNext, @elastic, @sentry, @arizeai, @CopilotKit, @factorialapp, and others.

July 23 | London & Virtual | Builders only

[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 🧵

[Daniel Lew @ShlomesLew]

@tylbar @mastra If there's only one thing @tylbar gives us it's definitely not mixed signals

[Mastra @mastra]

🆕 Mastra agents now support the Agent Client Protocol (ACP).

Run Claude Agent, Codex CLI, Cursor, Gemini CLI, or any other compatible harness directly from your Mastra agents.

[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

[Daniel Lew @ShlomesLew]

@calcsam *oprah voice* You get an agent YOU GET AN AGENT

[Daniel Lew @ShlomesLew]

@mastra cleeean

[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.

[Daniel Lew @ShlomesLew]

Have you taken a look through this section of the docs? https://t.co/rNSkn2Nno8

You'd want to store the state in the client side. The mcp app sends tool input to the client and the client is the one that renders and stores app state. You could also send messages from the client to the server to store state there as well.

[Sam Bhagwat @calcsam]

We’re excited to announce today that @mastra has raised a $22M Series A led by Spark Capital.

This brings our total capital raised to $35M:

[Daniel Lew @ShlomesLew]

@calcsam @mastra Hell yeah!

[Sam Bhagwat @calcsam]

Today, we’re launching the Mastra platform with tools to run your agents effectively at scale:

• Mastra Studio: evals, logs, traces, datasets, metrics
• Mastra Server: deploy agents + workflows
• Memory Gateway: SoTA agent memory

[Sam Bhagwat @calcsam]

we just shipped metrics and logs in @mastra studio

[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...

[Daniel Lew @ShlomesLew]

@YujohnNatt @mastra @YujohnNatt was created as an experiment too, we perfected the perfect engineer, couldn't have been possible without datasets