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.
git clone --depth 1 https://github.com/VuDZ/RoslynMcpServerWrote 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/rules/vudz/roslynmcpserver/roslyn-mcp-tools)<a href="https://agentmods.dev/rules/vudz/roslynmcpserver/roslyn-mcp-tools"><img src="https://agentmods.dev/badge/rules/vudz/roslynmcpserver/roslyn-mcp-tools/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/rules/vudz/roslynmcpserver/roslyn-mcp-tools"><img src="https://agentmods.dev/badge/rules/vudz/roslynmcpserver/roslyn-mcp-tools.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 | $0.00512 | $0.00512 |
| Opus 5 | $0.00256 | $0.00256 |
| Sonnet 5 | $0.00102 | $0.00102 |
| Haiku 4.5 | $0.00051 | $0.00051 |
Grade A, and why
roslyn-mcp-tools 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.
What it actually says
Tool mapping (avoid mixups)
| Intent | Tool | Key args |
|---|---|---|
| File/folder skeleton (disk) | get_code_skeleton |
path only (.cs or dir; max 20 files; skips bin/obj/Test) |
| Type skeleton in loaded workspace | get_class_skeleton |
symbol / workspace context |
| External/NuGet type body | decompile_type |
assemblyName or assemblyPath + fullTypeName |
| External signatures only | get_decompiled_class_skeleton |
same assembly args |
| Method in decompiled type | get_decompiled_method_body |
assembly + type + method |
| Explore DLL | explore_assembly |
assemblyName or assemblyPath |
| Symbol find | find_symbol_definition / find_usages / find_symbol_references |
prefer find_usages when only name known |
| Project folder rename | rename_project |
SDK-style; dryRun first; no namespace chain |
| Interfaces/base | find_implementations |
not find_usages |
Plain text in .cs |
search_code or host Grep |
leftover branding → caseSensitive=true |
| Build / test / run | run_dotnet_build / run_dotnet_test / run_specific_test / run_dotnet_run |
never shell dotnet for these; build: default noIncremental, optional configuration; tests: timeoutSeconds (build+test budget), optional noBuild/noRestore |
| NuGet vulns | run_nuget_audit |
separate from compile errors |
| Git status for agents | get_changed_files |
porcelain + suggested tests; no full diff |
Failure UX
Missing path on get_code_skeleton → friendly text error (do not throw unhandled MCP exception). Do not accept assemblyName/typeName on file skeleton tools.
Hybrid search (AGENTS)
- Shell grep/
Select-Stringforbidden for agent workflow. - C# symbols → MCP after
load_workspace. - Strings/comments/non-C# → host Grep/SemanticSearch OK.
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.
- 2d ago First seen · 33 lines · 512 tokens per session scan A 1aa5eed59163
roslyn-mcp-tools is a cursor rule published in the GitHub repository VuDZ/RoslynMcpServer (7 stars, last pushed yesterday), licensed MIT. It adds 512 tokens to every session, about $0.0026 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 2026-09-14.
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