RAG Evaluation Before You Promise Accuracy (2026 Guide)

Who this is for

Ship a thin vertical slice, measure, then widen. Big-bang rewrites rarely survive the first month of real traffic.

Decisions that still look smart in 18 months

Instrument the happy path and the ugly path. Silent failures are what turn a launch into a weekend incident.

Build checklist we actually use

Teams that write trade-offs down before coding burn fewer sprints when a stakeholder changes their mind mid-build. We keep ADRs short on purpose.

Failure modes we keep seeing

Instrument the happy path and the ugly path. Silent failures are what turn a launch into a weekend incident.

How we measure rollout

Ignore the buzzwords. For RAG Evaluation Before You Promise Accuracy (2026 Guide), the hard constraint is usually data ownership or ops capacity — not how many features fit on a roadmap slide.

We update this when delivery patterns change on live client work.