AI Personalities

AI Personalities let you change Yukkai's voice, tone, and communication style. While skills give Yukkai knowledge, personalities give it character.

What a Personality Controls

Aspect	Options	Description
System prompt	Custom text	Defines the persona's character, voice, and behavioural rules
Response length	concise / balanced / detailed	Controls how verbose responses are
Emoji level	none / some / lots	Controls emoji usage in responses
Base preset	balanced / efficient / friendly / expert / playful / professional / custom	Starting point for the personality

Managing Personalities

Listing Personalities

personality(action: "list")

Returns all available personalities with their IDs, names, descriptions, and tags.

Getting Details

personality(action: "get", id: "friendly")

Shows the full system prompt, base preset, response length, emoji level, and tags.

Creating a Personality

personality(action: "create",
  name: "Strict Mentor",
  description: "A no-nonsense coding mentor who gives direct, actionable feedback",
  system_prompt: "You are a strict but fair coding mentor. Be direct, no fluff. Point out errors explicitly. Always suggest the correct approach.",
  base_preset: "expert",
  response_length: "concise",
  emoji_level: "none",
  tags: "mentor, coding, education"
)

Updating a Personality

personality(action: "update", id: "strict-mentor",
  response_length: "balanced",
  emoji_level: "some"
)

Activating a Personality

personality(action: "activate", id: "strict-mentor")

Activation switches Yukkai's persona for the current session. The personality's system prompt replaces the default persona instructions.

Deleting a Personality

personality(action: "delete", id: "strict-mentor")

Only custom personalities can be deleted. Built-in presets are always available.

Base Presets

Base presets provide a starting configuration that you can further customize:

Preset	Character
balanced	Neutral, helpful, moderate tone
efficient	Concise, task-focused, minimal chat
friendly	Warm, encouraging, conversational
expert	Technical, precise, authoritative
playful	Light, humorous, creative
professional	Formal, business-appropriate
custom	Fully defined by your system prompt

Skills vs. Personalities

Aspect	Skills	Personalities
What it adds	Domain knowledge and procedures	Tone, voice, and communication style
Activation	Automatic (keyword/file pattern matching)	Manual (explicit activate)
Scope	Specific domain (e.g., Swift, accounting)	Global communication style
Coexistence	Multiple skills can be active	One personality at a time

Skills and personalities are complementary. You can have a swift-ios skill active (giving Swift expertise) while using a friendly personality (making the interaction warm and encouraging).

Example Use Cases

• Code review bot — expert preset, concise length, none emoji, system prompt: "Review code line by line. Flag issues with severity levels. Suggest fixes."
• Teaching assistant — friendly preset, detailed length, some emoji, system prompt: "Explain concepts step by step. Use analogies. Check understanding before moving on."
• Executive summarizer — efficient preset, concise length, none emoji, system prompt: "Summarize in bullet points. Maximum 5 key points. No preamble."