# External Application Button

> Communicate with external applications of your OS through a toolbar button or context menu item.

- **Type:** MCP server
- **Install:** `agentstack add mcp-andy-portmen-external-application-button`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [andy-portmen](https://agentstack.voostack.com/s/andy-portmen)
- **Installs:** 0
- **Category:** [Integrations](https://agentstack.voostack.com/c/integrations)
- **Latest version:** 0.1.0
- **License:** MPL-2.0
- **Upstream author:** [andy-portmen](https://github.com/andy-portmen)
- **Source:** https://github.com/andy-portmen/external-application-button
- **Website:** https://webextension.org/listing/external-application-button.html

## Install

```sh
agentstack add mcp-andy-portmen-external-application-button
```

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

## About

# External Application Launcher
Use external applications through a toolbar button or context menu item.

This extension lets you create a customizable toolbar button (action button) and context menu items to execute programs with your chosen command-line arguments. For example, you can:

- Send the current page to another browser
- Send selected text to a text editor
- Send image URLs to a photo editor
- Send download links to an external download manager!

### YouTube Preview
[](https://www.youtube.com/watch?v=sTOHWbX7dKU)

### MCP Server
This extension can be used with coding agents such as OpenCode. Also it can help other extensions to introduce their tools to the agents. Read [FAQs page](https://webextension.org/listing/external-application-button.html) for more info.

### Links
  * [Homepage](https://webextension.org/listing/external-application-button.html)
  * [Chrome Store](https://chrome.google.com/webstore/detail/external-application-butt/bifmfjgpgndemajpeeoiopbeilbaifdo)
  * [Firefox Add-ons](https://addons.mozilla.org/addon/external-application/)
  * [Opera Addons](https://addons.opera.com/en/extensions/details/external-application-button/)

## Source & license

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

- **Author:** [andy-portmen](https://github.com/andy-portmen)
- **Source:** [andy-portmen/external-application-button](https://github.com/andy-portmen/external-application-button)
- **License:** MPL-2.0
- **Homepage:** https://webextension.org/listing/external-application-button.html

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-andy-portmen-external-application-button
- Seller: https://agentstack.voostack.com/s/andy-portmen
- 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%.