Building a production AI agent in TypeScript with Mastra: a 2026 step-by-step.
I spent an afternoon last month wiring up an AI agent in raw TypeScript using the Anthropic SDK directly. The code worked, but I owned every piece of it: the tool dispatch loop, the conversation history array, the retry logic. Around 400 lines before the agent did anything interesting.
Mastra cuts that to about 60. A TypeScript-first agent framework with 24k+ GitHub stars, an active release cadence (88 releases as of May 2026), and a model router that talks to 40+ providers through one API. This tutorial goes from zero to a running agent with a custom tool and persistent memory. All code in this article runs.
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