Manage and optimize custom agent definition files (IDENTITY.md, AGENTS.md, SOUL.md, TOOLS.md). Also handles first-time employee initialization when .workspace/ has no IDENTITY.md. Use when users want to edit agent identity, modify workflow instructions, adjust personality, add/remove tools, optimize prompts, or initialize a new employee from scratch. Trigger signals: 'modify prompt', 'change identity', 'add tool', 'remove tool', 'optimize workflow', 'adjust personality', 'initialize employee', '修改提示词', '改身份', '加工具', '去掉工具', '优化能力', '调性格', '初始化员工', '创建员工'. Do NOT use for: skill creation (use skill-creator), skill searching (use find_skills tool).