Explanation

Background and reasoning — why the protocol is this narrow, why harness differences show up the way they do, and design decisions that don’t fit a tutorial or reference page.

Structuring a harness instruction — GOAL / CONTEXT / CONSTRAINTS / OUTPUT A default frame for writing AGENTS.md/CLAUDE.md content so instructions stay testable and repeatable through the harness, plus the deeper principle it exists to serve — fix the harness, not the prompt.