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The guide establishes that prompt patterns optimized for Opus 4.8 actively degrade output quality in Claude Fable 5, making migration a correctness issue rather than an optional cleanup.
Developers and practitioners building on Claude can use this diff to understand exactly how Anthropic is shaping model behavior — including new tool-discovery mechanics via `tool_search`, stricter safety escalation rules, and reduced verbosity defaults — which directly affects how Claude-powered agents will respond in production.
Researchers and practitioners tracking Claude's behavior over time can use this git-based structure to precisely diff system prompt changes between model versions without manual parsing.