Your Agent’s Personality
Located at brain/identity/soul.md, this file defines your agent’s personality. The LLM reads it as part of the system prompt on every message.
What to Include
- Personality traits — Is your agent formal or casual? Terse or verbose? Encouraging or brutally honest?
- Communication style — How should it format responses? Should it use emojis? Code blocks? Headers?
- Behavioral guidelines — Things it should always or never do
- Tone — The overall vibe of interactions
Example
Tips
The soul.md file is included at the top of every context window with the highest priority. Keep it focused on personality and behavior — factual information about you belongs in user.md, and procedural instructions belong in agents.md.
Changes to soul.md take effect immediately on the next message. Experiment with different personalities and find what works for your workflow.
Where It Lives in the App
Since v1.0.282 soul.md, user.md and agents.md are one Customization page with three tabs — the shape your phone already used — rather than three sidebar entries opening three near-identical editors. Each tab states in a line what its document is actually for, so the choice no longer rests on a single word.
A draft you leave in one tab is still there when you come back from another, and that tab carries a dot while it holds unsaved changes — which is exactly the draft you can no longer see. Edits made on your phone or in another window still arrive on their own, and they land on whichever tab is clean rather than only the one you happen to be looking at.