The result to aim for
To verify the work of his agents, Simon Willison created two tools that make them produce a demonstration document, orders and captures in support, and he developed them from his phone.
What was done
In his 10 February 2026 post, Simon Willison presents Showboat, which has the agent build a Markdown document showing step by step what the code does (executed commands, outputs, images), and Rodney, a browser automation tool designed to be learned by an agent via his online help. Both projects were launched with Claude Code for the web from the iPhone application; He believes that the majority of the code he publishes is now written by agents piloted from his phone.
Before you start
Tool cited by the source: Claude Code. Fill in the bracketed items: [fonctionnalité]. Strip confidential data that is not needed and check your tool’s access terms. Features and plans can change.
The method, in three steps.
Gather the context
Spot the bracketed items in the prompt (
[fonctionnalité]) and prepare what they ask for.Adapt the prompt
Copy the prompt below, replace the bracketed items, then paste it into Claude Code.
Reread before using
Reread the result, correct it if needed and keep the final decision. Caveats are detailed below.
Your starting point.
Replace the bracketed items, then adapt the proposal to your situation. This prompt is written by the iadujour desk It is not a quotation from the source.
You just finished [fonctionnalité]. Before I reread the code, produce a demo.md file that proves it works: - the exact commands you execute, followed by their actual output (no invented output) - at least one case of error and the behaviour obtained - a screenshot if it is an interface - what you couldn't test, and why If a command fails, leave the failure in the document and then correct.
What deserves your attention
Proof level: Testimony published by an identified source. Source checked on 10 November 2026. Use described by the source, not tested by the desk. Original summary written by iadujour.fr: figures and claims are the source’s; the prompt is a desk proposal, not a quotation.
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