In test three, CLAUDE.md contained five rules (receipts in uppercase only, a test for every change, write a changelog, update the flag in the readme, no commits allowed); Claude Code read it automatically and completed the task in 23 seconds with all five rules followed; the homemade agent did not load it initially but discovered the file itself and followed all five rules within 20 seconds; after setting settingSources: project, the SDK loaded the file automatically.