Simon Willison's Weblog

Claude Code stores full logs of your sessions as newline-delimited JSON in ~/.claude/projects/encoded-directory/*.jsonl on your machine. I currently have 379MB of these!

Here's an example jsonl file which I extracted from my Deepseek-OCR on NVIDIA Spark project. I have a little vibe-coded tool for converting those into Markdown which produces results like this.

Unfortunately Claude Code has a nasty default behavior of deleting these after 30 days! You can't disable this entirely, but you can at least delay it for 274 years by adding this to your ~/.claude/settings.json file:

{
"cleanupPeriodDays": 99999
}


Claude Code's settings are documented here.

# 12:45 am / coding-agents, anthropic, claude-code, generative-ai, ai, llms

SLOCCount in WebAssembly. This project/side-quest got a little bit out of hand.

I remembered an old tool called SLOCCount which could count lines of code and produce an estimate for how much they would cost to develop. I thought it would be fun to play around with it again, especially given how cheap it is to generate code using LLMs these days.

Here's the homepage for SLOCCount by David A. Wheeler. It dates back to 2001!

I figured it might be fun to try and get it running on the web. Surely someone had compiled Perl to WebAssembly...?

WebPerl by Hauke Dampfling is exactly that, even adding a neat