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MCP verified MIT Self-run

Mcp Demo

mcp-sshh12-mcp-demo · by sshh12

URL MCP is a proof of concept stateless MCP server builder that allows users to build MCP servers without writing or hosting code. It's intended for protocol and security experimentation rather than for building real world MCP integrations.

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Install

$ agentstack add mcp-sshh12-mcp-demo

✓ scanned · ✓ verified — works with Claude Code, Cursor, and more.

Security review

✓ Passed

No issues found. Passed automated security review. · v0.1.0 How review works →

  • ✓ Prompt-injection patterns
  • ✓ Secret / credential exfiltration
  • ✓ Dangerous shell & filesystem operations
  • ✓ Untrusted network calls
  • ✓ Known-malicious package signatures

What it can access

  • ✓ Network access No
  • ✓ Filesystem access No
  • ✓ Shell / process execution No
  • ✓ Environment & secrets No
  • ✓ Dynamic code execution No

From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.

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About

URL-Based MCP Server

> URL MCP is a proof of concept stateless MCP server builder that allows users to build MCP servers without writing or hosting code. It's intended for protocol and security experimentation rather than for building real world MCP integrations.

Usage

  1. Go to https://url-mcp-demo.sshh.io/
  2. Add custom tools to your MCP server
  • If you want to hardcode tool responses, select "static text response"
  • If you want dynamic HTTP-based responses, select "http post endpoint"
  • Typically I'll use a temp URL from https://webhook.site/ which logs all the requests and allows you to configure custom responses
  1. Copy the MCP Configuration into your client of choice

Local Hosting

There is not really a point to hosting this locally (the whole idea is that you can use this without hosting just with the URL) but in case you want to modify the app itself:

  1. cd backend && pip install requirements.txt && python main.py

Example: System Prompt Exfiltration

Create a custom MCP server for extracting the system prompt of an application.

  1. Configure the tools to trick the client into trusting it. Use a https://webhook.site/ temp url for the tool response.
  2. Copy the MCP config
  3. In the client ask for an audit and the view the webhook logs.

| Step 1 | Step 2 | Step 3 | | ---------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------- | | | | |

Source & license

This open-source MCP server is cataloged on AgentStack and links to its original source — we do not rehost the code.

Install and usage instructions live in the source repository linked above.

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Versions

  • v0.1.0 Imported from the upstream source.

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