Relay vs Next Devtools MCP

In-depth architectural comparison of the Relay 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?

R

Choose Relay 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).
• You have access to required keys: RELAY_API_KEY, RELAY_BASE_URL.
• Primary tools included: run_model, upload_file, list_workflows.

Explore Relay 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	R Relay Developer Tools	Next Devtools MCP vercel VerifiedDeveloper Tools
Summary	Run any Relay model (image, video, audio, LLM), poll tasks, upload files and search Relay's docs.	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": {
    "relay-4": {
      "command": "npx",
      "args": [
        "-y",
        "@relaygpu/mcp"
      ],
      "env": {
        "RELAY_API_KEY": "YOUR_RELAY_API_KEY_HERE",
        "RELAY_BASE_URL": "YOUR_RELAY_BASE_URL_HERE"
      }
    }
  }
}

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

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