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  5. System Prompt
Agents & Tool Useaka System Instruction

System Prompt

A system prompt is a high-priority instruction supplied by the application to shape a model's role, rules, and behavior.

Ask Melo about this← all terms

It is placed in a privileged message position supported by the model interface. It can guide behavior but is not a security boundary, so external authorization and validation remain necessary.

Related terms

Model Context ProtocolContext WindowAgent PlanningChain of ThoughtCopilot AutopilotMulti-Turn

Where System Prompt comes up

  • Claude Fable 5.1 System Prompt Leak: Did It Really Expose Private Memories?
  • Claude's System Prompt Grew From 300 to 3,000+ Words — What That Teaches Builders
  • ZCode System Prompt Leak: 391,439 Characters of GLM-5.3 Reveal Claude Code Roots
  • Claude Fable 5 System Prompt Leak: What's Inside Anthropic's 3,800-Line claude.ai Instructions