roslyn

roslyn is an MCP server for Claude Code, Cursor from darylmcd/Roslyn-Backed-MCP. Its token cost is not measured, scanned A, original, MIT.

A bridge that lets a coding agent inspect and work with C# code through Microsoft's Roslyn compiler tools. It runs locally with the `roslynmcp` command and limits access to approved folders.

In plain words
What is it for?
Use it to connect an agent to a C# repository for code analysis and related Roslyn-based tasks.
Why use it?
It gives the agent structured information about C# code instead of relying only on text search. The approved-folder setting helps restrict which files it can access.

MCP server for Claude CodeCursor

Written for Claude Code and Cursor: shipped in a Claude Code plugin, but also installed under .cursor/. Also seen: listed in .cursor/mcp.json.

Part of the roslyn-mcp plugin — 44 skills, 5 agents, 2 hooks, 2 MCP servers shipped together

Good fit Use it to connect an agent to a C# repository for code analysis and related Roslyn-based tasks.

Compare 6 mcp servers from other repositories ↓
Install with agentmods
npx agentmods add mcp/darylmcd/roslyn-backed-mcp/roslyn
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/darylmcd/Roslyn-Backed-MCP

Made for: Claude Code, Cursor.

Or install roslyn-mcp, the plugin that ships this one along with the rest of its 44 skills, 5 agents, 2 hooks, 2 MCP servers.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for roslyn

README.md
[![agentmods](https://agentmods.dev/badge/mcp/darylmcd/roslyn-backed-mcp/roslyn/github.svg)](https://agentmods.dev/mcp/darylmcd/roslyn-backed-mcp/roslyn)
Your own site
<a href="https://agentmods.dev/mcp/darylmcd/roslyn-backed-mcp/roslyn"><img src="https://agentmods.dev/badge/mcp/darylmcd/roslyn-backed-mcp/roslyn/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for roslyn

Your own site · 80×15
<a href="https://agentmods.dev/mcp/darylmcd/roslyn-backed-mcp/roslyn"><img src="https://agentmods.dev/badge/mcp/darylmcd/roslyn-backed-mcp/roslyn.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session not measured What this adds to a session before it is invoked.
When invoked not measured Not applicable: nothing here is loaded into a session.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Security

Grade A, and why

roslyn scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.cursor/mcp.json · 6 lines

What it actually says

{
  "roslyn": {
    "type": "stdio",
    "command": "roslynmcp"
  }
}
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2d ago Changed · -3 lines b4fcf6d5edf3
  2. 9d ago First seen · 9 lines scan A 3c25841c5df4

Subscribe to this mod's changes

roslyn is an MCP server published in the GitHub repository darylmcd/Roslyn-Backed-MCP (1 stars, last pushed yesterday), licensed MIT. Its token cost is not measured: an MCP server costs its tool schemas, not its config file. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.