> ## Documentation Index
> Fetch the complete documentation index at: https://wiki.platelunchcollective.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Retrieval Trigger

> A retrieval trigger is the model's implicit decision to invoke live web retrieval rather than answer from parametric memory.

*Core concept* · *AI Search Infrastructure*

## Definition

A retrieval trigger is the model's implicit decision to invoke live web retrieval rather than answer from parametric memory. In ChatGPT, approximately 46% of queries trigger retrieval. Shorter, more search-like queries trigger retrieval more often than long conversational prompts.

## Why It Matters for AI Search

[Retrieval optimization](https://www.platelunchcollective.com/services/citation-ready-content) only affects responses where retrieval is triggered. For the roughly 54% of ChatGPT queries answered from parametric memory alone, content structure and crawlability are irrelevant — parametric presence is the only lever. Understanding which query types trigger retrieval determines where to invest optimization effort. Queries that imply current information, specific data, or citations are more likely to trigger retrieval than general explanatory queries on established topics.

## Related Terms

<CardGroup cols={2}>
  <Card title="Parametric knowledge" href="/ai-search-glossary/parametric-knowledge" />

  <Card title="Retrieval knowledge" href="/ai-search-glossary/retrieval-knowledge" />

  <Card title="Query decomposition" href="/ai-search-glossary/query-decomposition" />

  <Card title="Informational query" href="/ai-search-glossary/informational-query" />

  <Card title="Post-hoc citation" href="/ai-search-glossary/post-hoc-citation" />
</CardGroup>

## Relevant Plate Lunch Collective Services

[AI SEO](https://www.platelunchcollective.com/services/ai-seo)  [Context Map](https://www.platelunchcollective.com/services/context-map)  [AI Search Visibility Assessment](https://www.platelunchcollective.com/services/context-map)