Five Persona Engine MCP Server

@kiro0x

Basic information

About Five Persona Engine MCP Server

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

#mcp#persona#llm #ai-safety#consistency#chatbot#roleplay#ai-agent #prompt-engineering

Five Persona Engine MCP Server config

Add this server to your MCP-compatible client using the configuration below.

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

Five Persona Engine MCP Server tools

Tool list not available yet

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Overview

What is Five Persona Engine?

Five Persona Engine is an MCP server that integrates with the FIVE Persona Engine API to generate structured JSON persona constraints for LLMs. Instead of describing personality in words, it defines behavioral parameters the LLM executes as a recipe, eliminating persona drift. It is intended for developers building consistent AI character interactions.

How to use Five Persona Engine?

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.

Key features of Five Persona Engine

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)

Use cases of Five Persona Engine

Building consistent AI game characters that behave predictably
Creating reliable role-playing assistants with stable personalities
Developing customer service bots with predefined behavioral profiles
Experimenting with persona-driven narrative generation

Frequently asked questions

What does the `generate` tool do?

It takes a character name, four axis choices (Q1–Q4), optional style sliders, and optional free text, then returns a JSON constraint object that defines the persona's behavioral parameters.

How do I get started?

Install the package with `pip install five-mcp`, obtain an API key from fiveengine.dev, set it as the `FIVE_API_KEY` environment variable, then run the server with `five-mcp` or configure it in Claude Desktop's `claude_desktop_config.json`.

How much does it cost?

Each `generate` call costs $1 and consumes one credit. Credits can be managed at fiveengine.dev.

Does it require an internet connection?

Yes, the server calls the FIVE Persona Engine API, so an internet connection and a valid API key are required.

What transport does the server use?

It uses stdio transport, making it compatible with any MCP client.

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