Companion
Your neighborhood friendly MCP utility for macOS, iOS, and visionOS
Install
$ agentstack add mcp-mattt-companion ✓ scanned · ✓ verified, works with Claude Code, Cursor, and more.
Security review
✓ PassedNo 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.
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.[](https://agentstack.voostack.com/security/report/mcp-mattt-companion) Reliability & compatibility
Declared compatibility
Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.
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 →About
Companion
Companion is a utility for testing and debugging your MCP servers on macOS, iOS, and visionOS. It's built using the official Swift SDK.
> [!IMPORTANT] > Companion is in early development and is still missing some important features, > including authentication, roots, and sampling. > > For a more complete MCP debugging experience, check out the > MCP Inspector.
Features
- [x] Connect to local and remote MCP servers
- [x] Easily browse available prompts, resources, and tools
- [x] Call tools, generate prompts with arguments, and download resources
Getting Started
First, download the Companion app (requires macOS 15 or later).
Or, if you have Homebrew installed, you can run the following command:
brew install --cask mattt/tap/CompanionWhen you open the app, you'll see a sidebar on the left and a placeholder view on the right. Click the + button in the toolbar to add an MCP server.
> [!TIP] > Looking for a fun MCP server? > Check out iMCP, > which gives models access to your Messages, Contacts, Reminders and more. > > Click on the iMCP menubar icon, > select "Copy server command to clipboard", > and paste that into the "Command" field for your STDIO server.
Once you add a server, it'll automatically connect. When it does, it'll show available prompts, resources, and tools. Click on one of those sections to see a list, and drill into whatever you're interested in. Or, select the parent item in the sidebar to get information about the server.
Requirements
- Xcode 16.3+
- macOS Sequoia 15+
- iOS / iPadOS 16+
- visionOS 2+
License
This project is available under the MIT license. See the LICENSE file for more info.
Legal
The app icon is a playful nod to Finder and Henohenomoheji (へのへのもへじ), a face drawn by Japanese schoolchildren using hiragana characters. Finder® is a trademark of Apple Inc.
This project is not affiliated with, endorsed, or sponsored by Apple Inc.
Source & license
This open-source MCP server is cataloged on AgentStack and links to its original source — we do not rehost the code.
- Author: mattt
- Source: mattt/Companion
- License: MIT
- Homepage: https://github.com/loopwork/Companion/releases/latest/download/Companion.zip
Install and usage instructions live in the source repository linked above.
Reviews
No reviews yet, be the first.
Write a review
Versions
- v0.1.0 Imported from the upstream source.