Prompt Rejector MCP Server

by revsmokeio.github.revsmoke/promptrejectormcpv1.0.1

Security gateway for AI agents: detects prompt injections, jailbreaks, and common vulnerabilities.

2Node.jsstdioofficial registry

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Active9d ago

Install Prompt Rejector MCP server

claude mcp add prompt-rejector -e YOUR_API_KEY='<your-api-key>' -- npx -y prompt-rejector

{
  "mcpServers": {
    "prompt-rejector": {
      "command": "npx",
      "args": [
        "-y",
        "prompt-rejector"
      ],
      "env": {
        "YOUR_API_KEY": "<your-api-key>"
      }
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (project).

{
  "mcpServers": {
    "prompt-rejector": {
      "command": "npx",
      "args": [
        "-y",
        "prompt-rejector"
      ],
      "env": {
        "YOUR_API_KEY": "<your-api-key>"
      }
    }
  }
}

Settings → Developer → Edit Config (claude_desktop_config.json), then restart.

{
  "servers": {
    "prompt-rejector": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "prompt-rejector"
      ],
      "env": {
        "YOUR_API_KEY": "<your-api-key>"
      }
    }
  }
}

Add to .vscode/mcp.json in your workspace.

{
  "mcpServers": {
    "prompt-rejector": {
      "command": "npx",
      "args": [
        "-y",
        "prompt-rejector"
      ],
      "env": {
        "YOUR_API_KEY": "<your-api-key>"
      }
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json.

Configuration

Variable	Required	Secret	Description
YOUR_API_KEY	yes	yes	Your API key for the service

Freshness

Active — last maintenance signal 9d ago. The newest of the signals below sets the band.

Last commit (default branch)
2026-10-01 · 9d ago · GitHub
Latest release
2026-10-01 · 9d ago · GitHub · v2.0.0
Package published
no data · npm/PyPI
Registry entry updated
2026-01-28 · 9mo ago · official registry · v1.0.1

FAQ

›How do I install the Prompt Rejector MCP server in Claude Code?

Run: claude mcp add prompt-rejector -e YOUR_API_KEY='<your-api-key>' -- npx -y prompt-rejector. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.

›Does Prompt Rejector require an API key?

Yes. It expects YOUR_API_KEY, of which 1 is a secret.

›Can I use Prompt Rejector as a remote (hosted) MCP server?

No hosted endpoint is published; it runs locally over stdio.

›Is Prompt Rejector in the official MCP registry?

Yes, as io.github.revsmoke/promptrejectormcp.