Definition

Canary prompt

A canary prompt is a prompt with a stable, known-good expected output, run at a fixed cadence against each engine to detect when parsing quality degrades.

When an engine changes its layout, canaries fail before customer data goes visibly wrong, which converts a silent data-quality incident into a paging alert.

Publishing canary health is one of the few honest ways a vendor can show whether its data was trustworthy last week.

Nostimates measures canary prompt across twelve AI answer surfaces. Request access →

All terms

AEO (Answer Engine Optimisation)GEO (Generative Engine Optimisation)AI Overviews AI Mode Citation share n-sampling Query fan-out Grounding Share of voice (AI)Extraction success rate Surface Answer engine Citation Brand mention Mention rate Confidence interval Statistical significance Citation volatility Non-determinism Reproducibility Identity-free collection Personalisation Locale Residential proxy Bot detection Collection cost Credit Evidence retention Audit trail Parser version Data freshness Cadence Prompt set Head term Long-tail query Competitive set llms.txt robots.txt AI crawler Training crawler Retrieval-augmented generation (RAG)Hallucination Answer box Featured snippet Zero-click search Entity Entity salience Knowledge graph Structured data JSON-LD schema.org FAQ schema Answer-first content Chunk Embedding Semantic search Prompt injection Market coverage Sentiment analysis Position tracking White-label data