How does Claude Opus 5's narration behavior affect agentic prompting?

Claude Opus 5 tends to narrate more during agentic work than earlier models - announcing what it's about to do before taking an action - and its per-message output during agentic sessions tends to run longer as a result.

Left unguided, this can make agent transcripts noisier than teams may want, especially in production settings where users see this narration directly rather than just the final result.

Anthropic's guidance recommends describing the specific narration cadence wanted, rather than simply forbidding narration outright - for example, asking for one sentence before the first tool call, brief updates only when something important changes, and a final message that leads with the outcome, since positive descriptions of desired style tend to work better than blanket instructions.

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