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Hypothesis
A site assistant can answer well and qualify leads in the same conversation, without gating basic answers behind contact forms.
Setup
DeepSeek streaming chat with a first-person persona, a 16k-token prefix-cached knowledge pack, full-text retrieval over the published writing, and a 12 req/min cap sitting under a 15/min edge rule. In the corner of every page, and inside the services, case-study and blog pages.
Current reading
Matching the visitor’s language is a useful trust cue. Punctuation checks also exposed a gap between instructions and enforcement: a prompt can request a writing style, while output checks enforce the chosen rules. Three controlled turns recorded on 19 July 2026 had cache-hit rates of 99.8%, 87.7% and 99.4%; that small historical sample does not establish the current production rate.