Constraining Agents with CLAUDE.md: Practical Tips for Claude Opus Coding

PawelHuryn · x · 2026-08-10

The author shares practical experiences from coding with the Claude Opus model. While Opus is more capable than version 4.8, simply cutting 80% of its instructions didn't work as expected.

To better control the Agent's behavior, the author found that defining specific rule blocks in CLAUDE.md, such as setting strict delivery standards like "Done means done," effectively ensures the model accurately executes complex development tasks.

Related event: Practical Tips: Controlling Claude Opus via CLAUDE.md(2 posts)→

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