SlowPost Holds Angry Drafts Overnight Before Sending Them

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SlowPost is an open-source tool that acts as a delayed post office for messages users may regret sending in the moment. Users paste an angry draft, and the system rewrites it into a calmer version using technique cards retrieved and reranked for relevance, with the rewrite scored against a transparent heat lexicon. Letters are held overnight, with production mode unlocking them at 09:00 the next morning and a public demo shortening the hold to three minutes. The project is written in TypeScript with Fastify and zod, stores letters in a small JSON file rather than a database, and lets any OpenAI-compatible endpoint serve the open-weight models. The developer reports that retrieval quality mattered more than prompt wording, and that a smaller, faster model outperformed a newer reasoning model on this narrow task.

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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