System prompts in the Claude Agent SDK — string vs file vs preset, the claude_code preset and its append field, dynamic prompts via per-turn rebuilding, and how setting_sources composes user/project/local instructions. Read when designing the agent's voice and operating principles, when migrating an
System prompts in the Claude Agent SDK — string vs file vs preset, the claude_code preset and its append field, dynamic prompts via per-turn rebuilding, and how setting_sources composes user/project/local instructions. Read when designing the agent's voice and operating principles, when migrating an existing prompt into the SDK shape, or when choosing between a static and a dynamic prompt.
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