# Just-in-Time Context Just-in-time context keeps lightweight identifiers—paths, links, names, queries, or resource URIs—in the active context and retrieves the referenced detail only when a task requires it. This is especially close to Bryant's addressability philosophy: a named block, document, variable, account resource, or system resource can be pointed to without copying its entire content into every document. Related: [[wiki/Context Engineering|Context Engineering]], [[wiki/Resource Addressing|Resource Addressing]], [[wiki/Progressive Disclosure|Progressive Disclosure]]. Source: [Anthropic — Effective context engineering for AI agents](https://www.anthropic.com/engineering/effective-context-engineering-for-ai-agents)