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kiro0x

five-mcp

by kiro0x
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Python
Remote

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 →

Measured: with the constraint JSON + free harness, the demo character survived a 120-turn pressure test with zero persona breaks (plain prompt: 8 breaks; JSON alone: 1). Numbers, transcripts and scripts →

Free — no API key, no account.

Quick Start

Install

pip install five-mcp

Use with Claude Desktop

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "five-character-engine": {
      "command": "five-mcp"
    }
  }
}

That's it — no environment variables needed.

Use with other MCP clients

Any MCP-compatible client can connect via stdio transport:

five-mcp

Related MCP server: CSL-Core

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",
  "constraint": { "..." }
}

Rate limits

The API is free. To keep it available to everyone, a light per-IP limit applies: 10 requests/min, 200 requests/day. The free host may cold-start, so the first call can take up to a minute.

Links

License

MIT

mcp-name: io.github.kiro0x/five-mcp

Install Server
A
license - permissive license
A
quality
A
maintenance

How are these scores calculated?

Maintenance

–Maintainers
–Response time
–Release cycle
1Releases (12mo)
Commit activity

Resources

Unclaimed servers have limited discoverability.

Looking for Admin?

If you are the server author, to access and configure the admin panel.

Tools

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