Claude 4 system prompt was just leaked, 10,000 words long, it's a goldmine.

It reveals how it uses structured prompt patterns to stay aligned and avoid hallucinations.

It also shows how the model manages tools like APIs and web search with precise logic.

â–¸ Uses Declarative Intent to explain limitations before acting
â–¸ Fences behaviors using Boundary Signaling and conditional logic
â–¸ Mitigates hallucinations via fallback rules and scoped responses
â–¸ Invokes tools through strict XML-like protocols
â–¸ Repeats constraints with Positional Reinforcement to reduce drift in long prompts

Source: https://lnkd.in/gzrCAXYr
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