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Developer shares 3 bugs AI agents failed to fix while building a terminal multiplexer

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A developer building 'wimux', a terminal multiplexer written largely by AI agents, documented three persistent bugs the AI could not resolve despite multiple attempts. The first bug involved corrupted terminal display after pane splits, where four AI-suggested fixes failed until the developer traced the root cause to rapid resize events overwhelming the PTY layer. The second bug caused the first keystroke after clicking a pane to be lost, which took days to diagnose and was ultimately traced to focus being stolen during sidebar clicks rather than any issue with the terminal itself. A reproduction harness confirmed the fix worked, restoring all lost keystrokes. The cases highlight that AI agents tend to apply fixes at the wrong layer of a system, and that targeted diagnostic tools — rather than repeated patches — are often what breaks a debugging deadlock.

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Developer shares 3 bugs AI agents failed to fix while building a terminal multiplexer · ShortSingh