passenger: An open-source IDE for C# and .NET, built with Avalonia, for Windows, macOS and Linux

by Zaneris · MCP Server · ★ 166

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How to install passenger

claude mcp add passenger -- /Applications/Passenger.app/Contents/MacOS/Passenger --mcp-attach
codex mcp add passenger -- /Applications/Passenger.app/Contents/MacOS/Passenger --mcp-attach

Taken from the project's README on GitHub. Check the security audit before running it.

Security audit verdict: SAFE · quality 61/100

None of the 42 rules matched — no credential harvesting, no data exfiltration, no curl-pipe-shell installer. Scanned against 42 published rules built on the SlowMist agent-security taxonomy, refreshed every 8 hours. Full audit →

The quality score combines nine heuristic checks of the repo and its README: completeness, clarity, specificity, examples, structure, agent readiness, step-by-step content, instruction quality and security notes. It rates how well the project explains itself to an agent, not the code.

avaloniacsharpdebuggerdotnetidemcpprofilerroslyn

Quick Facts

Stars166
Forks13
LanguageC#
CategoryMCP Server
LicenseMIT
Quality Score61/100
Open Issues52
Last Updated2026-10-23
Created2026-10-11
Platformsdotnet, mcp
Est. Tokens~21k

About passenger

Passenger An IDE for C# and modern .NET, written in C# with Avalonia, free and open source under MIT. Windows and macOS first, with builds for Linux (how to install them). Website • Download • What it does • Your coding agent • Building • Contributing Passenger edits, builds, runs, tests, debugs and profiles C# and .NET.

Compatible Skills

These tools work well together with passenger for enhanced workflows:

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How this security grade is produced

Grades come from a rule-based scan built on the SlowMist agent-security taxonomy: 42 published rules, covering credential harvesting, data exfiltration, curl | sh installers and more. It is a first-layer scan, not a manual audit — we say so rather than overstate it.

The scale of the problem is documented independently: Liu et al. (2026), in a study of 31,132 agent skills, report that 26.1% contain security vulnerabilities. Our own full-catalog census is published as a citable open dataset.

Sources & who's responsible:

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