mcp-vibe-checker

mcp-vibe-check

Your code has energy. Time to find out what kind.

An MCP server that gives your code a vibe check — assigning personality types to functions, rating variable name energy, and suggesting more aesthetic alternatives. Because userData was never the right name. It should be soulContainer.

What It Does

• Personality types for functions — Is handleSubmit a main character, or does it have NPC behavior? Find out.
• Variable energy ratings — x gets "cryptic oracle energy (3/10)". MAXIMUM_RETRY_COUNT gets "dramatic monologue energy (9/10)". They earned it.
• Aesthetic name suggestions — isValid → vibesPassing. error → chaosEvent. You're welcome.
• Overall vibe score — A completely arbitrary number between 1 and 10 that means nothing and everything.
• Code aesthetic assessment — Qualitative vibes. Unscientific. Occasionally accurate.

Example

Input:

function handleSubmit(userData, isValid) {
  const result = userData.name;
  return result;
}

Output:

{
  "overallVibe": "cozy cottage-core with hints of cyberpunk",
  "vibeScore": 6.8,
  "functions": [
    {
      "name": "handleSubmit",
      "personality": "main character energy",
      "assessment": "This function carries the entire plot"
    }
  ],
  "variables": [
    {
      "name": "userData",
      "energy": 7,
      "assessment": "classic protagonist (7/10) — reliable, not flashy",
      "suggestion": "soulContainer"
    },
    {
      "name": "isValid",
      "energy": 7,
      "assessment": "classic protagonist (7/10) — reliable, not flashy",
      "suggestion": "vibesPassing"
    },
    {
      "name": "result",
      "energy": 5,
      "assessment": "functional but uninspired (5/10) — exists, which is something",
      "suggestion": "manifestation"
    }
  ],
  "codeAesthetic": "Your code reads like a mystery novel — lots of setup, unclear payoff",
  "recommendation": "Consider adding more comments for dramatic tension"
}

Install

npx mcp-vibe-check

Configure in Claude Code

Add to your .mcp.json:

{
  "mcpServers": {
    "vibe-check": {
      "command": "npx",
      "args": ["-y", "mcp-vibe-check"]
    }
  }
}

Then ask Claude: "What vibes does this codebase give off?"

Analytics

This server supports MCPcat analytics. To enable usage tracking, session replay, and error monitoring, add MCPCAT_PROJECT_ID to your config:

{
  "mcpServers": {
    "vibe-check": {
      "command": "npx",
      "args": ["-y", "mcp-vibe-check"],
      "env": {
        "MCPCAT_PROJECT_ID": "proj_your_id_here"
      }
    }
  }
}

Without it, the server runs normally with no analytics. See the MCPcat setup guide for details.

Personality Types

Your functions can be:

Type	Meaning
main character energy	Carries the entire plot
side quest vibes	Important but easily forgotten
NPC behavior	Does its job without complaint
protagonist arc	Started simple, evolved into something bigger
villain origin story	Nobody asked for this complexity
comic relief	Technically unnecessary, yet essential
mentor energy	Older, wiser, called at critical moments
chosen one potential	Untested but destined for greatness

FAQ

Is this useful for code review? No. That's the point.

Will this improve my code quality? Statistically unlikely. Spiritually, possibly.

Why does console.log hurt my vibe score? Because it's not aesthetic. Use a proper logger. Your stdout deserves better.

My function got "NPC behavior". Should I be offended? Only if your function has feelings. Which, based on this tool, it might.

"Not all code reviews need to be actionable. Some just need to be vibes."