AI Agent Soul File (SOUL.md)

A SOUL.md (or soul file) is a configuration document that defines the core identity and personality of an AI agent. It goes beyond a simple system prompt by providing a comprehensive specification of who the agent is, how it communicates, what it values, and what boundaries it respects.

The soul file typically includes: identity (name, role, purpose), personality traits (friendly, professional, casual, authoritative), communication style (tone, formality, language preferences), values and principles (what the agent cares about and prioritizes), knowledge boundaries (what topics to engage with and which to decline), behavioral rules (specific do's and don'ts), and example interactions (showing ideal responses).

The concept was popularized by the AI agent community as a way to create consistent, well-defined agent personalities that feel authentic rather than generic. A well-crafted soul file helps the agent maintain character across thousands of conversations.

Think of the soul file as the agent's "personality blueprint." Just as a brand guide defines how a company communicates, a soul file defines how an AI agent interacts with users. Builders on platforms like Chipp configure these through the agent setup interface, which translates their choices into the system prompt and behavioral configuration.