Generative demos are inexpensive; production features are not. Legal, risk, and engineering ultimately share one scenario: next Tuesday the model drifts and the summarization widget fabricates a clause a signer relied on. An evaluation harness is the non-hand-wavy answer—a place where behavior is measured instead of narrated.
Golden datasets earn their name when they carry real business edge cases
Hundreds of anonymized inputs—empty payloads, bilingual fragments, tables, noisy OCR—paired with acceptable output sketches, behave like versioned schemas. When marketing refreshes examples without engineering review, headline metrics drift without anyone noticing.
Automated scoring only tracks reality when humans calibrate it
Deterministic checks—schema fit, required citations, forbidden phrases—pair naturally with periodic human ratings. Low annotator agreement usually means noisy labels, not a problem for the optimizer to solve.
CI for prompts is how model upgrades stop being roulette
System prompt edits and provider bumps deserve regression jobs with latency and cost ceilings attached. Deploy gates tied to stakeholder-agreed failure thresholds keep “we tested locally” from becoming an incident postmortem theme.
Degradation paths belong in the architecture diagram, not the apology email
There should be a documented line between model path, deterministic template fallback, human review queue, and read-only mode. Feature flags that disable model calls without blacking out the whole surface separate safety incidents from availability ones.
Lineage and retention answers now show up in Middle East RFPs
Which prompts and completions are stored, for how long, and who can access them should be loggable truth, not tribal knowledge. Training opt-outs and residency promises need clear maps to subprocessors—the question is already on procurement worksheets.
Shipping AI safely rewards measurement culture. Teams that invest in harnesses move faster after the first serious audit because evidence is routine—not because someone pulled an all-nighter on slides.