Become an AI engineer

Agentic harness

Agentic harness is a unit of 10 lessons in Rabbithole's Become an AI engineer course, at levels 3 to 4.

Lessons

1. Human in the loop: pausing a workflow for a personLevel 3
2. Agent Deployment: From Local Agent to Running ServiceLevel 3
3. The agent loopLevel 3
4. Agent SDKs and frameworks: what they run for youLevel 3
5. Guardrails: checks around an LLM callLevel 3
6. Secrets Management: Keep Credentials Out of Your CodeLevel 3
7. Designing tools for agentsLevel 3
8. Tool Search: Let the Model Look Up Its ToolsLevel 3
9. Why agents fail, and how to test for itLevel 4
10. Harness engineering: the system around the modelLevel 4

Sources

These lessons draw on 19 sources. The most used:

• Agent Development Kit (ADK)
• OpenAI Agents SDK
• SWE-agent: Agent-Computer Interfaces Enable Automated Software Engineering
• AgentBench: Evaluating LLMs as Agents
• Claude Cookbooks
• OpenAI Guardrails Python
• Claude Docs — Tool Use and Agent Tools
• Codex as a platform: build on the open agent harness

All units in Become an AI engineer