Step 1
Install in your client
Config is the same across clients — only the file and path differ.
CD
Supported in Claude Desktopstdio · Node 18+
Paste into ~/Library/Application Support/Claude/claude_desktop_config.json
{
"mcpServers": {
"mcp-handler": {
"args": [
"-y",
"mcp-handler"
],
"command": "npx"
}
}
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What Mcp Handler does
A Vercel adapter for the Model Context Protocol (MCP), enabling real-time communication between your applications and AI models. Supports Next.js and Nuxt.
Test This Server
Run this in your terminal to verify the server starts. Then let us know if it worked — your result helps other developers.
npx -y 'mcp-handler' 2>&1 | head -1 && echo "✓ Server started successfully"
After testing, let us know if it worked:
Scored, not listed
Why this score
Five weighted categories — click any category to see the underlying evidence.
Score breakdown
90/100across 5 weighted dimensions
0255075100
30
15
20
15
10
−10
Security
Maintenance
Efficiency
Documentation
Compatibility
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Security
OSV.dev1 fixed
GHSA-w2fm-25vw-vh7flow · fixedCVSS 3.1
mcp-handler has a tool response leak across concurrent client sessions ('Race Condition')
`mcp-handler` versions prior to 1.1.0 accepted `@modelcontextprotocol/sdk` < 1.26.0 as a peer dependency. That SDK version contains a vulnerability [[CVE-2026-25536](https://nvd.nist.gov/vuln/detail/CVE-2026-25536)] that causes concurrent requests from different clients to share server-side state including authentication context and tool execution results when a `StreamableHTTPServerTransport` instance is reused across requests. **Note:** This is _not_ a vulnerability in `mcp-handler` itself. T
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Frequently Asked Questions
- Is Mcp Handler safe to use?
- Mcp Handler has no known CVEs as of the latest MCPpedia security scan. It does not require authentication, so any local process can connect — keep this in mind in shared environments.
- How do I install Mcp Handler?
- Mcp Handler supports copy-paste install configs on its MCPpedia page for Claude Desktop, Cursor, and Claude Code. Scroll to the Quick Install section and select your client.
- What can Mcp Handler do?
- Mcp Handler provides 1 tool: roll_dice. See the full tools list on the server page for descriptions and parameters.
- What AI clients work with Mcp Handler?
- Mcp Handler is compatible with claude-desktop, cursor, claude-code. It uses stdio transport.
- Is Mcp Handler actively maintained?
- Mcp Handler is recently maintained — last commit was 56 days ago. It has 603 GitHub stars.
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