caveman-core-mcp

MCP server that teaches LLMs to respond in compressed caveman-style prose.
Cuts output tokens ~65% while keeping full technical accuracy. Zero external dependencies.

What it exposes

Prompts

Resources

Tools

Related MCP server: toon-parse-mcp

Install

{
  "mcpServers": {
    "caveman": {
      "command": "node",
      "args": ["/path/to/caveman-core-mcp/src/index.js"]
    }
  }
}

Or with npx after publishing:

{
  "mcpServers": {
    "caveman": {
      "command": "npx",
      "args": ["caveman-core-mcp"]
    }
  }
}

Usage

Inject via prompt (recommended)

Use the caveman prompt at session start. The host sends the ruleset as context and the LLM adopts compressed mode for the rest of the session.

Inject via resource

Read caveman://rules and include the text in your system prompt manually.

Post-process text

Call the compress_text tool to strip filler from any already-generated text.

{
  "name": "compress_text",
  "arguments": {
    "text": "Sure! I'd be happy to help you with that. The issue you're experiencing is likely caused by a missing semicolon."
  }
}

Returns:

{
  "content": [{ "type": "text", "text": "Issue caused by missing semicolon." }],
  "_meta": { "before": 95, "after": 35, "savedPercent": 63 }
}

Requirements

• Node.js >= 18

• No npm dependencies

Origin

Based on caveman by Julius Brussee (MIT).

• src/compress.js — derived from src/mcp-servers/caveman-shrink/compress.js

• src/skill.js — derived from skills/caveman/SKILL.md

• src/index.js — new standalone MCP server built on top of the above