Giving Codex more context means organizing and exposing the right information so the agent can reason over it, rather than overwhelming it with ad-hoc instructions. In the same way you would onboard a new teammate on product principles, engineering norms, and team culture (emoji preferences included), giving the agent this information leads to better-aligned output.
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The onboarding a new teammate lens to agent context engineering
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kind of the opposite of company - Glean, where it helps you work with all those other sources. In this case, the sources are pulled into the repo (and organized).