MCP verified MPL-2.0 Self-run

External Application Button

Name: External Application Button
Availability: InStock
Author: andy-portmen

mcp-andy-portmen-external-application-button · by andy-portmen

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

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Install

$ agentstack add mcp-andy-portmen-external-application-button

✓ 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.

View the full security report →

Verified badge

Passed review? Show it. Paste this badge into your README, it links to the public security report.

Links to your public security report.

[![AgentStack Verified](https://agentstack.voostack.com/badges/verified.svg)](https://agentstack.voostack.com/security/report/mcp-andy-portmen-external-application-button)

Reliability & compatibility

✓ Security review passed

0 installs to date

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● 16d ago

Declared compatibility

Claude CodeClaude DesktopCursorWindsurf

Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.

Preview Execution monitoring

We're building live execution health for every listing: tool-call success rate, median latency, uptime, and last-checked timestamps, measured, not self-reported. It isn't live yet, so we don't show numbers we can't stand behind.

How agent discovery & health will work →

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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 for more info.

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
Source: 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.

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Versions

v0.1.0 Imported from the upstream source.