How to Build AI Agents, From the Guy Who Wrote the Framework | Sam, Mastra
🔗 Link do vídeo: https://www.youtube.com/watch?v=tGhFgRdUcZg
🆔 ID do vídeo: tGhFgRdUcZg
📅 Publicado em: 2026-08-14T16:56:04Z
📺 Canal: Composio
⏱️ Duração (ISO): PT1H1M59S
⏱️ Duração formatada: 01:01:59
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Fewer than five people on Earth have built two open-source JavaScript framework companies. Sam is one of them — first Gatsby, now Mastra.
The book that made him known started as almost a joke. His co-founder said "what if you wrote a book?" So he locked himself in a room for two weekends, printed it, and brought it to Demo Day. It's now one of the go-to texts for building agents.
We filmed at Y Combinator, where Mastra went through the Winter 2025 batch.
In this episode:
→ The "unknown knowns" — how they forgot they were world-class at the thing they walked away from
→ Why "that's interesting" is the most dangerous thing a user can tell you
→ Why planning in quarters is dead
→ Why it's okay to quit your idea and go join something that's scaling
→ The Netlify acquisition, and what it actually cost
→ The new loneliness of building with agents
→ Writing a print book in an era that moves too fast to print
Get the book: https://mastra.ai/books/principles-of-building-ai-agents
Follow Sam: https://www.linkedin.com/in/sambhagwat/
⏱️ TIMESTAMPS
00:00 Intro — Y Combinator
01:30 What Mastra Is
03:00 Content Wants to Be Frequent
05:00 Shipping a Tier-One Feature Every Day
07:00 The $13M Seed and $22M Series A
09:00 Turn-Based vs. Real-Time Strategy
12:00 Why Experience Beats Fresh Eyes
15:00 "That's Interesting" Means They're Not Interested
18:00 It's Okay to Quit Your Idea
21:00 The Book That Started as a Joke
25:00 From Journalism to Open Source
28:00 The Netlify Acquisition, and What It Cost
32:00 The Unknown Knowns
36:00 The YC Winter '25 Takeoff Story
40:00 Remote Work Is Underrated in the Age of AI
44:00 The New Loneliness of Building With Agents
47:00 What He Still Can't Figure Out About Agents
This is a Composio "Agents at Work" podcast, where I sit down with founders building the next leap of AI.
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