Michael Arnaldi

Coding Agents Need Library Source Code, Not Longer Prompts

Michael Arnaldi, of Effectful, argues that coding agents use Effect better when the project gives them the Effect source code, not just better prompts or documentation. In a workshop starting from an empty repository, he demonstrates cloning the Effect repo into the project, having the agent extract local pattern files, and then using strict TypeScript diagnostics, tests, lint rules and persistent instructions to steer the agent toward a working Effect HTTP API.