Two tools for agentic development · ↗ simonwillison.net

Showboat and Rodney

Sep 16, 2026 · 1 min read

Earlier this year, Simon Willison released some neat tools for agentic development: Showboat and Rodney.

Showboat is a CLI tool to help agents build Markdown documents demonstrating how their code works. The tool allows an agent to add, step-by-step, a mixture of comments, code blocks, and output to build a complete code demonstration.

Rodney is a CLI tool for Chrome browser automation that can be used to test functionality and accessibility. It can be used with Showboat to demonstrate code that creates web interfaces.