Agent Express
Middleware framework for AI agents — Express.js for LLMs
What is Agent Express?
Agent Express is an open-source middleware framework for building AI agents in TypeScript. If you've written Express.js middleware, you already know how to build agents. The model-tool-model loop in an agent is structurally identical to the request-response cycle in a web server — a context flows through composable (ctx, next) functions. Three concepts: Agent, Session, Middleware. Five hooks. Built-in middlewares for budget tracking, guardrails, observability, memory compaction and others.
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