Five Persona Engine

Created By

kiro0x2 months ago

LLM persona consistency engine — enforce JSON personality and style constraints across interactions. Prevents persona drift with 160,000 deductively-derived behavioral rules.

# mcp

# persona

Overview Content Tools Comments

Overview

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.

License

MIT

Try in Playground

Server Config

{
  "mcpServers": {
    "five-character-engine": {
      "command": "five-mcp",
      "env": {
        "FIVE_API_KEY": "five_sk_your_key_here"
      }
    }
  }
}

Project Info

Created At

2 months ago

Updated At

2 months ago

Author Name

kiro0x

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