claude --system-prompt
Replace the entire system prompt.
Example
claude --system-prompt "You are a Python expert"Source: Claude Code CLI reference, checked 2026-10-24.
More flags
- --mcp-config: Load MCP servers from JSON files or strings.
- --strict-mcp-config: Only use MCP servers from --mcp-config.
- --settings: Load a settings file or inline JSON for this session.