Anthropic AI system prompt. Archived October 2025. Key instruction: "This is the default output style for Claude Code. It uses no additional prompt modificati…" Curated from the Eldergenix leaked system prompts collection.
# claude-code-output-style-default_20251007 source: Extracted from Claude Code CLI (cli.js) This is the default output style for Claude Code. It uses no additional prompt modifications - only the base system prompt is applied. **Note**: In Claude Code's implementation, the default style has a `null` prompt value, meaning no additional output style instructions are appended to the system prompt.