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160,000 deductively-derived JSON constraints that enforce LLM persona consistency — eliminates persona drift across inte
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 →
pip install five-mcp
Set your API key as an environment variable:
export FIVE_API_KEY=five_sk_your_key_here
Get your key at fiveengine.dev.
Add to your claude_desktop_config.json:
{
"mcpServers": {
"five-character-engine": {
"command": "five-mcp",
"env": {
"FIVE_API_KEY": "five_sk_your_key_here"
}
}
}
}
Any MCP-compatible client can connect via stdio transport:
five-mcp
generateGenerates persona constraints via the FIVE engine.
| 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 |
{
"status": "ok",
"remaining": 42,
"constraint": { "..." }
}
Each generate call costs $1 and consumes one credit. Manage credits at fiveengine.dev.
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