Building an AI Agent CLI from scratch in PHP
summary
A minimal PHP CLI agent is implemented using Laravel AI SDK that runs a simple agent loop: an outer user turn and an inner loop that processes model tool calls via two-call contracts. Concrete tools shown include list_files, read_file and post_tweet; an approved tweet posts successfully while a read_file on a missing path fails. The harness adds sandboxing, tool approval, observability and replay, and the model remains unchanged while tool-enabled capabilities make it practically useful.
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chapters (10)
- 0:00Introduction to AI agents
- 1:49Understanding model vs agent
- 3:28The role of the harness
- 5:26Harness lifecycle and safety
- 7:13Building the agent loop
- 10:42Advanced agent capabilities
- 13:59Applying AI in workflows
- 17:50Observability and failures
- 21:16Implementing with Laravel AI
- 25:31Q&A and conclusion
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