# Mcp Demo

> 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.

- **Type:** MCP server
- **Install:** `agentstack add mcp-sshh12-mcp-demo`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [sshh12](https://agentstack.voostack.com/s/sshh12)
- **Installs:** 0
- **Category:** [Integrations](https://agentstack.voostack.com/c/integrations)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [sshh12](https://github.com/sshh12)
- **Source:** https://github.com/sshh12/mcp-demo
- **Website:** https://url-mcp-demo.sshh.io/

## Install

```sh
agentstack add mcp-sshh12-mcp-demo
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## 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

3. 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.

- **Author:** [sshh12](https://github.com/sshh12)
- **Source:** [sshh12/mcp-demo](https://github.com/sshh12/mcp-demo)
- **License:** MIT
- **Homepage:** https://url-mcp-demo.sshh.io/

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

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/mcp-sshh12-mcp-demo
- Seller: https://agentstack.voostack.com/s/sshh12
- Browse the marketplace: https://agentstack.voostack.com/browse

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Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.