Building AI Agents in TypeScript with Mastra Raja Krishna

Building AI Agents in TypeScript with Mastra

Agenda

Why not ChatGPT
Why build your own
Mastra
Live demo

Why not ChatGPT

You watch it work. You cannot see how.

You type a prompt. ChatGPT calls tools, MCP, memory.
You cannot inspect evals, swap models, or leave OpenAI.

Use cases

Why build your own?

See your own evaluations
Run local LLMs
Swap providers, not just OpenAI
Fallback when a provider is down

Your UI, not their chat tab
Tools and MCP you control
Memory you own

Mastra

You own the whole process.

DEMO

Cat typing on a computer

Not in the demo

There is more you can do.

Mastra Client, your own UI
Model fallbacks across providers
Semantic recall / RAG
Deploy as a server
Channels and voice


model: {
  id: "ollama/llama3.2",
  url: "http://localhost:11434/v1",
}

This repo uses openai/gpt-5-mini. LM Studio works the same at :1234/v1.

Thank you

GitHub QR code

GitHub

LinkedIn