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Original: Simon Willison · 19/02/2026

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Summary

Reached the stage of parallel agent psychosis where I’ve lost a whole feature. Reached the stage of parallel agent psychosis where I’ve lost a whole feature - I know I had it yesterday, but I can’t seem to find the branch or worktree or cloud instance or checkout with it in.

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Key Insights

“Reached the stage of parallel agent psychosis where I’ve lost a whole feature.” — Describing the frustration of losing a feature’s code.
“Turns out I’d been hacking on a random prototype in /tmp.” — Explaining how the code was lost due to a computer crash.
“It’s all still there in ~/.claude/projects/ session logs and Claude Code can extract it out.” — Highlighting Claude Code’s ability to recover lost code from session logs.

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Topics

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Full Article

# Recovering lost code
Author: Simon Willison
Published: 2026-02-19
Source: https://simonwillison.net/2026/Feb/19/recovering-lost-code/#atom-everything
Reached the stage of parallel agent psychosis where I’ve lost a whole feature - I know I had it yesterday, but I can’t seem to find the branch or worktree or cloud instance or checkout with it in. … found it! Turns out I’d been hacking on a random prototype in /tmp and then my computer crashed and rebooted and I lost the code… but it’s all still there in ~/.claude/projects/ session logs and Claude Code can extract it out and spin up the missing feature again.

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Key Takeaways

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Notable Quotes

Reached the stage of parallel agent psychosis where I’ve lost a whole feature.
Context: Describing the frustration of losing a feature’s code.
Turns out I’d been hacking on a random prototype in /tmp.
Context: Explaining how the code was lost due to a computer crash.
It’s all still there in ~/.claude/projects/ session logs and Claude Code can extract it out.
Context: Highlighting Claude Code’s ability to recover lost code from session logs.
  • [[topics/prompt-engineering]]
  • [[topics/agent-native-architecture]]
  • [[topics/claude-code]]

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Originally published at https://simonwillison.net/2026/Feb/19/recovering-lost-code/#atom-everything.