MCP.so

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
OverviewContentToolsComments
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

ParameterTypeRequiredDescription
character_namestringYesName of the character
q1 – q4A / B / C / DYesPersonality axis choices
s1 – s41–5NoStyle sliders (default: 3)
free_textstringNoFree-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
Star
-
Language
-
License
-
Category
Tags
mcp
persona
Homepage
https://github.com/kiro0x/five-mcp

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