What
The internal system prompt section heading "Communication style" was renamed to "Text output (does not apply to tool calls)" to clarify that the communication guidelines apply only to text output shown to the user.
Details
- The body of the prompt is unchanged — the same guidance about brief updates, no narration, and clear communication still applies.
- The heading clarification may result in slightly improved model behavior when making tool calls, as the model has a clearer signal that the style guidelines do not constrain tool call formatting.
- This prompt is only active for Opus 4.6 sessions with the
quiet_salted_emberflag enabled.
Evidence
Heading change from "# Communication style" to "# Text output (does not apply to tool calls)" (search for "Text output (does not apply to tool calls)")
Strings lifted out of the shipped bundle, so the claim above can be checked against them.