- 1. Extreme caution after child safety refusals.
- 2. Tools before questions on minor ambiguities.
- 3. Full task completion without partial stops.
Anthropic updated the Claude 4.7 system prompt on April 18, 2026. The changes add four rules on safety, conversations, clarification, and tool use. Simon Willison published the prompt on his blog.
Bitcoin traded at $74,796 USD on April 18, 2026, down 1.2% in 24 hours, per CoinGecko. Ethereum fell 2.4% to $2,293.53 USD. These conditions test AI trading tools.
Rule 1: Caution After Safety Refusals
The first rule requires extreme caution after child safety refusals. The prompt states: “Once Claude refuses a request for reasons of child safety, all subsequent requests in the same conversation must be approached with extreme caution,” per Simon Willison.
Willison noted this improves long-term safety. In finance, Robert Mitchnick, BlackRock digital assets head, stressed AI safety at the Digital Asset Summit on April 17, 2026.
Rule 2: Honor Conversation End Signals
The second rule directs Claude to end conversations on user signals. The prompt says: “If a user indicates they are ready to end the conversation, Claude does not request that the user stay.”
This follows user intent. Finance bots must respect exits during volatility, such as Bitcoin's 1.2% drop.
Crypto Prices on April 18, 2026
- Asset: BTC · Price (USD): 74,796 · 24h Change: -1.2% · Market Cap (B USD): 1,496.7
- Asset: ETH · Price (USD): 2,293.53 · 24h Change: -2.4% · Market Cap (B USD): 276.8
- Asset: XRP · Price (USD): 1.41 · 24h Change: -0.9% · Market Cap (B USD): 87.0
- Asset: SOL · Price (USD): 85.17 · 24h Change: -1.1% · Market Cap (B USD): 49.0
- Asset: DOGE · Price (USD): 0.09 · 24h Change: -0.4% · Market Cap (B USD): 14.5
CoinGecko supplied data. The Fear & Greed Index hit 27, per Alternative.me, indicating extreme fear.
Rule 3: Act First on Minor Gaps
The third rule prioritizes action over questions for minor details. The prompt instructs: “When a request leaves minor details unspecified... Claude makes a reasonable attempt now.”
Claude uses tools for ambiguities, per Willison. Trading bots apply this by calling APIs during volatility.
Rule 4: Complete All Tasks
The fourth rule requires full task completion. The prompt states: “Once Claude starts on a task, Claude sees it through to a complete answer.”
This supports reliable agents. In finance, it aids risk reports during Ethereum's 2.4% drop.
Finance Applications
The rules support trading bots via tool use, per Willison. BlackRock tests AI for on-chain analysis, said Mitchnick.
Coinbase explores agentic AI for custody.
EU MiCA Alignment
Updates align with EU MiCA rules from January 2026. Vera Fischer, ESMA policy officer, said on April 19, 2026, that AI prompts must ensure transparency.
Claude 4.7 rules meet risk standards for fintech bots.
AI Agents Outlook
Developers adapt Claude 4.7 system prompt for fintech. Amid Bitcoin's $1.496 trillion market cap, reliable AI aids trading. Future versions may add tools.
Frequently Asked Questions
What is the first rule in Claude 4.7 system prompt?
Extreme caution after child safety refusals. Quote: 'all subsequent requests... must be approached with extreme caution,' per Simon Willison.
How does Claude 4.7 handle unspecified details?
Makes reasonable attempts first, uses tools like search before questions. From <acting_vs_clarifying> section.
Does Claude 4.7 respect conversation ends?
Yes, avoids prolonging if user signals exit. Prompt enforces user intent.
How do changes impact finance AI?
Tool use and full completion aid trading bots in volatile markets like BTC at $74,796.
