Prompt template

• You need repeatable prompts across many entities (users, SKUs, locales).
• Designers or PMs must tweak phrasing without code deploys.
• You want to A/B test context order or wording safely.

Templates turn prompting into product surface area. They enable experimentation without developer bottlenecks, but increase risk of injections if placeholders are unsanitized. PMs own which fields are allowed, how they’re escaped, and what telemetry is captured to catch regressions. Good templates shorten lead time for growth experiments while keeping support costs stable.

Define a typed schema for each variable, including max length and sanitization. Keep templates in version-controlled files with preview snapshots. Pair each template change with synthetic evals and a canary rollout. In 2026, connect templates to localization keys and to your design system tokens so language, tone, and formatting stay consistent across channels.

A pricing page generator uses a template with placeholders for value prop, segment, and region. After enforcing a 280-character cap and HTML escaping, incident rate for malformed pages drops to near zero while experiment velocity doubles (5 tests/week → 10 tests/week).

• Concatenating raw user text without escaping, opening injection vectors.
• Letting templates bloat with optional fields that rarely matter.
• Skipping previews, leading to broken formatting in production UIs.