The Price You'll Honor — A Self-Serve Instant Quote Where the AI Never Touches the Number
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What you'll do
A live, public instant-quote endpoint you own end to end: an owner-editable price book in integer cents that is the single source of every number, a pure arithmetic engine with golden tests that runs with no model involved, a Claude tool schema generated from that price book so the model can only choose service codes that actually have prices and has no field to write money into, a fail-closed handler that routes to a human whenever the model declines, hedges, or fails to return a structured call at all, a deterministic refusal ladder that keeps site-visit and out-of-area jobs away from instant pricing entirely, HMAC-signed quote records so a customer cannot edit their own total and a price change tomorrow cannot rewrite what you promised today, Turnstile plus a rate limit that you personally attack with curl before trusting, an adversarial prompt corpus proving that no amount of "my friend got 90% off" changes a single cent, a cost model built from your own token counts with prompt caching on the price-book prefix, and a nightly canary that re-prices a golden basket and tells you when your own numbers have drifted.