Context Engineering

Principle expression

Primary: P09 Supporting: P02, P14, P08

Scope

Own one judgment: for a named agent action, which source information must reach the agent, when must it become available, and what is the smallest runtime-evidenced delivery path that preserves source authority?

Context engineering owns delivery, not content. A project source, accepted design, or domain skill supplies meaning; this skill decides how the selected agent can discover the relevant part at the moment it changes action. Loaded instructions, summaries, indexes, and retrieved fragments remain projections unless separately governed as sources.