Changes in the system prompt between Claude Opus 4.6 and 4.7

• Simon Willison diffed the official Claude.ai system prompts between Opus 4.6 and 4.7 — Anthropic publishes these, but the changes aren't highlighted in the launch blog post
• Newly added: "Claude in PowerPoint — a slides agent" is now listed as a tool Claude Cowork can use, alongside Claude in Chrome and Claude in Excel (not mentioned in 4.6)
• The child safety section was greatly expanded and now lives inside a `<critical_child_safety_instructions>` tag — once Claude refuses on child safety grounds, it must treat all subsequent messages in the same conversation with "extreme caution"
• A new `<acting_vs_clarifying>` section explicitly tells Claude: "the person typically wants Claude to make a reasonable attempt now, not to be interviewed first" — Claude should only ask clarifying questions when the request is literally unanswerable without the missing info
• Claude is now instructed not to keep users engaged when they signal they want to stop — "does not request that the user stay in the interaction or try to elicit another turn"