Five Persona Engine
About
LLM persona consistency engine — enforce JSON personality and style constraints across interactions. Prevents persona drift with 160,000 deductively-derived behavioral rules.
Details
- Author
- kiro0x
- Downloads
- 273
- Categories
- Other, AI
Jump to
- Generates structured JSON persona constraints via the FIVE engine
- Eliminates LLM persona drift with deterministic behavioral parameters
- Single generate tool with required and optional parameters
- API key authentication via environment variable
- Stdio transport for MCP client compatibility
- Each generate call costs $1 (one credit)
Setting up with Highlight
This MCP is not yet compatible with Highlight’s one-click setup. However, you can still use it with Highlight by following these steps:
- Download and install Highlight from highlightai.com/download
- Navigate to the plugins tab and select "Add Custom Plugin"
-
Configure the plugin with the settings below
Plugin Name
Five Persona EngineCommand (node, npx, python, etc.)Please refer to the README for specific instructions on how to obtain API keys or other required environment variables.
- Enable "Start Automatically" if you want the plugin to start when Highlight launches
From the repository
Install via pip (pip install five-mcp), set the FIVE_API_KEY environment variable (get a key at fiveengine.dev), then run the server (five-mcp) with any MCP-compatible client. Use the generate tool to produce persona constraints by providing a character name and four personality axis choices (Q1–Q4), with optional style sliders (S1–S4, default 3) and free-form text.
Claude Desktop / Cursor
Paste into your MCP client config file to install this server.
{
"mcpServers": {
"five persona engine": {
"five-character-engine": {
"command": "five-mcp",
"env": {
"FIVE_API_KEY": "five_sk_your_key_here"
}
}
}
}
}McpServers
{
"five-character-engine": {
"command": "five-mcp",
"env": {
"FIVE_API_KEY": "five_sk_your_key_here"
}
}
}five-mcp
MCP server for the FIVE Persona Engine — an LLM persona constraint engine that generates structured JSON constraints to eliminate persona drift. Instead of describing personality in words (which LLMs interpret differently each turn), FIVE defines behavioral parameters the LLM executes as a recipe. See how it works →
Quick Start
Install
pip install five-mcp
Configure
Set your API key as an environment variable:
export FIVE_API_KEY=five_sk_your_key_here
Get your key at fiveengine.dev.
Use with Claude Desktop
Add to your claude_desktop_config.json:
{
"mcpServers": {
"five-character-engine": {
"command": "five-mcp",
"env": {
"FIVE_API_KEY": "five_sk_your_key_here"
}
}
}
}
Use with other MCP clients
Any MCP-compatible client can connect via stdio transport:
five-mcp
Tool: generate
Generates persona constraints via the FIVE engine.
Parameters
| Parameter | Type | Required | Description |
|-----------|------|----------|-------------|
| character_name | string | Yes | Name of the character |
| q1 – q4 | A / B / C / D | Yes | Personality axis choices |
| s1 – s4 | 1–5 | No | Style sliders (default: 3) |
| free_text | string | No | Free-form description |
Response
{
"status": "ok",
"remaining": 42,
"constraint": { "..." }
}
Pricing
Each generate call costs $1 and consumes one credit. Manage credits at fiveengine.dev.
Links
- API & Docs: fiveengine.dev
- GitHub: github.com/kiro0x/five-mcp
- Design philosophy & examples: five-character-engine README
- Engine repo: github.com/kiro0x/five-character-engine
License
MIT
<!-- mcp-name: io.github.kiro0x/five-mcp -->
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