Sleepy Hollow

Sleepy Hollow is an agentic-first headless API framework for Node.js and Bun with Specification-Governed Agentic Development built in.

Just like any human developer, an AI agent needs a set of procedures, best practices, and requirements to work against. The framework supplies them, so you can build endpoints rapidly without giving up the review you would demand from any other developer.

It provides file-based routing, schema validation, embedded SQLite, optional PostgreSQL, per-route security declarations, generated API contracts, and deployment. While your tests run it records what each handler actually did, and hollow check refuses to certify a route that carries approved criteria but that no test ever exercised.

Add the framework to a project:

npm install @sleepy-hollow/framework

Install the CLI as hollow:

npm install -g @sleepy-hollow/framework

Sleepy Hollow is built through Specification-Governed Agentic Development, a method in which a human approves reviewed requirements, an agent implements only what they authorize, and evidence decides when the work is done.

Read the documentation Browse the API reference Read how SGAD works View the package on npm View Sleepy Hollow on GitHub