Three agent patterns

Start with these runnable examples in the repository. Each includes exact commands, expected output, and troubleshooting.

Pattern	What you learn	Provider key
Prompt chain	Required inputs, intermediate variables, structured final output	Optional in demo mode
Tool agent	Tool lifecycle events, classified read failure, model-directed retry	Optional in demo mode
Approval	Durable suspension and resume in a fresh process	None

From a source checkout:

npm ci
npm run build
node examples/patterns/prompt-chain.mjs --demo
node examples/patterns/tool-agent.mjs --demo
node examples/patterns/approval.mjs
node examples/patterns/approval.mjs --approve

The demos substitute model responses while using the real runtime, tools, and stores. To run the prompt chain or tool agent against OpenAI, set OPENAI_API_KEY and omit --demo.

Next, use embedding to customize the host or the quickstart to write your own YAML agent.