Annotated Presentation Creator. I've released a new version of my tool for creating annotated presentations. I use this to turn slides from my talks into posts like this one - here are a bunch more examples.
I wrote the first version in August 2023 making extensive use of ChatGPT and GPT-4. That older version can still be seen here.
This new edition is a design refresh using Claude 3.7 Sonnet (thinking). I ran this command:
llm \
-f https://til.simonwillison.net/tools/annotated-presentations \
-s 'Improve this tool by making it respnonsive for mobile, improving the styling' \
-m claude-3.7-sonnet -o thinking 1
That uses -f to fetch the original HTML (which has embedded CSS and JavaScript in a single page, convenient for working with LLMs) as a prompt fragment, then applies the system prompt instructions "Improve this tool by making it respnonsive for mobile, improving the styling" (typo included).
Here's the full transcript (generated using llm logs -cue) and a diff illustrating the changes. Total cost 10.7781 cents.
There was one visual glitch: the slides were distorted like this:

I decided to try o4-mini to see if it could spot the problem (after fixing this LLM bug):
llm o4-mini \
-a bug.png \
-f https://tools.simonwillison.net/annotated-presentations \
-s 'Suggest a minimal fix for this distorted image'
It suggested adding align-items: flex-start; to my .bundle class (it quoted the @media (min-width: 768px) bit but the solution was to add it to .bundle at the top level), which fixed the bug.

Recent articles
- Video: Building a tool to copy-paste share terminal sessions using Claude Code for web - 23rd October 2025
- Dane Stuckey (OpenAI CISO) on prompt injection risks for ChatGPT Atlas - 22nd October 2025
- Living dangerously with Claude - 22nd October 2025