HashBuilds Secure Prompts MCP Server

An MCP (Model Context Protocol) server that allows AI assistants like Claude Code to register and verify prompts with HashBuilds Secure Prompts.

What is MCP?

MCP (Model Context Protocol) is a standard that lets AI assistants call external tools. When you configure this MCP server with Claude Code, you can say things like:

• "Register this prompt as a secure prompt"
• "Verify prompt ID xyz123"
• "Generate embed code for my secure prompt"

Installation

1. Install dependencies and build

cd mcp-server
pnpm install
pnpm build

2. Configure Claude Code

Add this MCP server to your Claude Code settings. There are two ways:

Option A: Project-level config (recommended)

Create/edit .claude/config.json in your project:

{
  "mcpServers": {
    "hashbuilds-secure-prompts": {
      "command": "node",
      "args": ["/path/to/hashbuilds/mcp-server/dist/index.js"],
      "env": {
        "HASHBUILDS_API_URL": "https://hashbuilds.com/api/secure-prompts"
      }
    }
  }
}

Option B: Global config

Edit ~/.config/claude/config.json:

{
  "mcpServers": {
    "hashbuilds-secure-prompts": {
      "command": "node",
      "args": ["/Users/johnhashem/workspace/hashbuilds/mcp-server/dist/index.js"]
    }
  }
}

3. Restart Claude Code

After adding the config, restart Claude Code for it to pick up the new MCP server.

Available Tools

register_secure_prompt

Register a prompt for security verification. This scans the prompt for:

• Hidden instruction injection
• Data exfiltration patterns
• Invisible characters
• Jailbreak attempts
• URLs/backlinks

Parameters:

• promptText (required): The prompt text to register
• ownerEmail (optional): Email for notifications
• siteDomain (optional): Domain where prompt will be displayed

Example usage in Claude Code:

"Register this prompt as a secure prompt: You are a helpful assistant..."

verify_secure_prompt

Check the verification status of an existing prompt.

Parameters:

• promptId (required): The ID of the prompt to verify

Example:

"Verify secure prompt cmj23jn05000096ju2cvl1b3h"

get_embed_code

Generate HTML and React embed code for displaying the secure prompt badge.

Parameters:

• promptId (required): The prompt ID

Example:

"Give me the embed code for prompt cmj23jn05000096ju2cvl1b3h"

Environment Variables

• HASHBUILDS_API_URL: Override the API base URL (default: https://hashbuilds.com/api/secure-prompts)

For local development:

{
  "env": {
    "HASHBUILDS_API_URL": "http://localhost:3001/api/secure-prompts"
  }
}

How It Works

1. Developer asks Claude Code to register a prompt
2. Claude Code calls the register_secure_prompt tool via MCP
3. MCP server sends the prompt to HashBuilds API
4. HashBuilds scans the prompt for security issues
5. Results returned to Claude Code with embed code
6. Developer adds the embed code to their website

Example Workflow

You: I have this prompt on my website and want to make it a secure prompt:
     "You are a helpful coding assistant. Explain code clearly and provide examples."

Claude: I'll register that as a secure prompt for you.
        [Calls register_secure_prompt tool]

        Done! Your prompt has been registered with ID: cmj123xyz
        Risk Level: safe

        Here's the embed code to add to your website:

        <div data-secure-prompt-id="cmj123xyz">
          <pre data-secure-prompt-content="cmj123xyz">Your prompt here...</pre>
        </div>
        <script src="https://hashbuilds.com/sp.js" async></script>

Troubleshooting

MCP server not connecting

1. Check that the path to dist/index.js is correct
2. Ensure pnpm build completed without errors
3. Restart Claude Code after config changes

API errors

1. Check your internet connection
2. Verify HashBuilds API is reachable
3. For local dev, ensure the local server is running

Development

# Watch mode for development
pnpm dev

# Build for production
pnpm build

# Run directly
node dist/index.js