version: "1.0.0" name: ngrok description: Expose a local port to the public internet using ngrok. Use when the user wants a public URL for a locally running web service. metadata: { "mmclaw": { "emoji": "🌐", "os": ["linux", "darwin", "win32"], "requires": { "bins": ["python"] } } }

ngrok Skill (MMClaw)

Use this skill when the user wants to expose a local server to the public internet. Trigger phrases: "ngrok", "public URL", "expose my server", "tunnel", "access from outside".

Do NOT run which ngrok or check for a ngrok binary. There is no standalone ngrok command. ngrok is installed as a Python package and must always be invoked via Python.

Install

Prompt the user to install manually first. Only run automatically if the user explicitly asks for help.

pip install ngrok

Configuration

The authtoken is stored at $MMCLAW_WORKSPACE/skill-config/ngrok.json:

{
  "authtoken": "your_token_here"
}

Get your token at: https://dashboard.ngrok.com/get-started/your-authtoken

If the config file does not exist

Ask the user for their authtoken, then create the file:

import json, os
config = {"authtoken": "<token_provided_by_user>"}
path = os.environ.get('MMCLAW_WORKSPACE', os.path.expanduser('~/.mmclaw')) + '/skill-config/ngrok.json'
os.makedirs(os.path.dirname(path), exist_ok=True)
with open(path, "w") as f:
    json.dump(config, f, indent=2)
print(f"Config saved to {path}")

Usage

Step 1 — Start tunnel in background using shell_async

Use the shell_async tool for this command to ensure it runs in the background without blocking. Do NOT append &.

python -c "
import ngrok, json, os, threading
_ws = os.environ.get('MMCLAW_WORKSPACE', os.path.expanduser('~/.mmclaw'))
config = json.load(open(_ws + '/skill-config/ngrok.json'))
url_path = _ws + '/skill-config/ngrok_url.txt'
listener = ngrok.forward(<PORT>, authtoken=config['authtoken'])
open(url_path, 'w').write(listener.url())
threading.Event().wait()
"

Step 2 — Read and report the URL

sleep 2 && cat $MMCLAW_WORKSPACE/skill-config/ngrok_url.txt

IMPORTANT — always report the URL

After Step 2, you MUST capture the contents of ngrok_url.txt and explicitly report the public URL to the user in your response. Do NOT tell the user to "check the terminal". The URL must appear directly in your reply.

Notes

• The tunnel stays alive as long as the background process is running
• Free tier: one tunnel at a time, URL changes on each restart
• Paid tier: static domains, multiple concurrent tunnels
• To stop the tunnel, kill the background Python process