Borrowing it
Nothing to install: this file belongs to MarcelRoozekrans/roslyn-codelens-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/MarcelRoozekrans/roslyn-codelens-mcp/main/CLAUDE.mdgit clone --depth 1 https://github.com/MarcelRoozekrans/roslyn-codelens-mcpWrote 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.
[](https://agentmods.dev/instructions/marcelroozekrans/roslyn-codelens-mcp/claude-md)<a href="https://agentmods.dev/instructions/marcelroozekrans/roslyn-codelens-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/marcelroozekrans/roslyn-codelens-mcp/claude-md/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.
<a href="https://agentmods.dev/instructions/marcelroozekrans/roslyn-codelens-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/marcelroozekrans/roslyn-codelens-mcp/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00255 | $0.00255 |
| Opus 5 | $0.00128 | $0.00128 |
| Sonnet 5 | $0.00051 | $0.00051 |
| Haiku 4.5 | $0.00026 | $0.00026 |
Grade A, and why
roslyn-codelens-mcp CLAUDE.md 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 10d 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.
What it actually says
Roslyn CodeLens MCP
This is a Roslyn-based MCP server that provides semantic code intelligence for .NET codebases.
MCP Server
The .mcp.json configures the roslyn-codelens MCP server to analyze this solution. It runs via dotnet run and connects over stdio.
Skill
The plugins/roslyn-codelens/skills/roslyn-codelens/SKILL.md skill teaches Claude when and how to use the 67 code intelligence tools. Use the MCP tools instead of Grep/Glob for any .NET semantic queries (finding implementations, callers, references, diagnostics, etc.).
Project Structure
src/RoslynCodeLens/— MCP server (entry point: Program.cs)tests/RoslynCodeLens.Tests/— Unit tests (xUnit)benchmarks/RoslynCodeLens.Benchmarks/— BenchmarkDotNet performance testsplugins/roslyn-codelens/— Claude Code skill definition
Development
- Build:
dotnet build - Test:
dotnet test - Benchmarks:
dotnet run --project benchmarks/RoslynCodeLens.Benchmarks -c Release
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.
- 10d ago First seen · 25 lines · 255 tokens per session scan A 6fc773e88bb2
roslyn-codelens-mcp CLAUDE.md is an instructions file published in the GitHub repository MarcelRoozekrans/roslyn-codelens-mcp (48 stars, last pushed today), licensed MIT. It adds 255 tokens to every session, about $0.0013 per session on Opus 5. 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 2026-08-30.
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API patterns for .NET — REST conventions, ProblemDetails, pagination, versioning, error responses.
plan-forge errorhandling.instructions.md
Error handling patterns — Exception hierarchy, ProblemDetails responses, error boundaries, global exception middleware.
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
codex AGENTS.md
AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
spec-kit AGENTS.md
AGENTS.md instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.