Rails creator DHH used Claude Fable to rewrite the Python library TerminalTextEffects into Rust in 3 hours and 11 minutes, using 11 million tokens. The rewrite reduced startup time from 87 milliseconds to 2 milliseconds and increased rendering speed by 9.6 times. DHH now embraces an “agent-first” approach, predicting few will manually code within five years.
The Rust port (ttfx) runs all 37 terminal animation effects as a 3MB static executable under the Omarchy organization on GitHub (omacom-io/ttfx). The process used eight parallel agents on separate branches with CI parity verification against TerminalTextEffects v0.15.0.