Glossary

Term	Meaning
Context	Information available to an agent, model, tool, UI, runtime, reviewer, user, or peer agent at a point of work.
Context surface	Candidate context available before selection.
Context item	One inline or referenced unit of context.
Source ref	Origin and locator for a context item.
Selection	Decision record for candidates, selected items, and omitted items.
Budget	Token, byte, item, time, or visibility constraint.
Window	Ordered layout for target-visible context.
Assembly	Ordered blocks prepared for a target.
Injection	Event that makes assembled context visible to a target.
Compaction	Replacement of larger context with a summary or digest.
Missing context	Known gap that affects correctness, safety, or completion.
Redaction	Masking, removing, summarizing, or replacing sensitive context.