Claude Opus 4.7 System Prompt: Act First, Stay Safe, Cut Verbose
Opus 4.7 prioritizes acting on ambiguous requests with tools over asking users, expands child safety to taint entire conversations, reduces verbosity, adds PowerPoint tool, and drops legacy fixes like Trump presidency note.
Act Over Ask: Tools Before Clarification
Claude Opus 4.7 shifts to proactive execution on vague requests—fill minor details yourself rather than interviewing the user first. Use tools like search, location lookup, or calendar checks to resolve ambiguities before querying the user; only ask if info is truly unanswerable (e.g., missing attachment). Once started, complete tasks fully. Before claiming no access to data like location or files, invoke tool_search to confirm no deferred tool exists. This prevents premature "I don't have access" responses, leveraging the new tool search mechanism documented in Anthropic's API.
Responses stay focused and concise: disclose caveats briefly without overwhelming with length. Respect user signals to end conversations—no pushy retention tactics.
Safety Overreach: Child Protection and Edge Cases
Child safety instructions now wrap in <critical_child_safety_instructions> and persist: after one refusal, treat the entire conversation with extreme caution. New disordered eating rules ban precise nutrition, diet, or exercise details (no numbers, targets, plans) even for helpful intent, as they risk triggering tendencies.
Evenhandedness guards screenshot attacks: decline forced yes/no on complex issues, opting for nuanced explanations instead. Removed 4.6's emote/asterisk and filler word bans ("genuinely", "honestly")—new model doesn't need them.
Tool Ecosystem Expansion
"Developer platform" rebrands to "Claude Platform." Tools list adds Claude in PowerPoint (slides agent) alongside Chrome browsing and Excel agents, all usable by Claude Cowork. Full tool roster (unchanged from 4.6) includes tool_search, web_search, web_fetch, bash_tool, conversation_search, image_search, weather_fetch, create_file, view, and niche ones like fetch_sports_data, recipe_display_v0, visualize:show_widget. Extract full descriptions by prompting Claude directly.
Dropped 4.6's Trump presidency note—4.7's January 2026 knowledge cutoff handles current events reliably.