How can you optimize agentic narration behavior in Claude Opus 5 through prompting?

Rather than issuing a blanket "don't narrate" instruction, which Anthropic's guidance suggests is less effective, describe the specific cadence you actually want: for example, one sentence before the first tool call to set expectations, brief updates only when something important surfaces or the plan changes direction, and a final message that leads with the outcome rather than a recap of the process.

Positive, concrete descriptions of desired communication style tend to outperform purely negative instructions listing what not to do, a pattern that applies to narration specifically but also reflects a more general prompting principle for Opus 5.

For user-facing agentic products specifically, it's worth testing this narration guidance against real user sessions rather than just isolated test prompts, since the right cadence often depends on how much visibility into the process your specific users actually want during a multi-step task.

Combine narration-cadence guidance with the separate conciseness instructions needed to control overall response length, since the two address related but distinct behavioral shifts, more frequent narration and longer default responses, that don't automatically get fixed by tuning just one of them.

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