CompletionKit vs Next Devtools MCP

In-depth architectural comparison of the CompletionKit and Next Devtools MCP MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

Which MCP Server Should You Choose?

Choose CompletionKit when:

• You need dedicated capabilities in the Developer Tools domain.
• You prefer remote streaming HTTP/SSE transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).

Explore CompletionKit Details

Choose Next Devtools MCP when:

• You need dedicated capabilities in the Developer Tools domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).
• Primary tools included: nextjs_index, nextjs_call, nextjs_docs.

Explore Next Devtools MCP Details

Feature & Specification Comparison

Specification	CompletionKit Developer Tools	Next Devtools MCP vercel VerifiedDeveloper Tools
Summary	Prompt evals over MCP: run a prompt on your dataset, score each output 1-5 with an LLM judge.	Official Next.js MCP server for coding agents. Provides runtime diagnostics, route inspection, dev server logs, docs search, and upgrade guides. Requires Next.js 16+ dev server for full runtime features.
Category & Scope

Tools & Capabilities Breakdown

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

{
  "mcpServers": {
    "completionkit": {
      "url": "https://your-app.com/completion_kit/mcp"
    }
  }
}

{
  "mcpServers": {
    "vercel-next-devtools-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "next-devtools-mcp@latest"
      ]
    }
  }
}

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