What is ILSpy-MCP CLAUDE.md?

Repository instructions for ILSpy-MCP, a server that lets AI assistants inspect and analyze .NET software, including compiled applications.

Use it when adding decompilation or code-analysis features, tracing references, searching strings, extracting resources, or fixing bugs in the C# project.

It records the project's structure, technology choices, compatibility limits, and testing expectations so changes follow the existing design.

How cervonwong/ILSpy-MCP configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to cervonwong/ILSpy-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.

Copy the file

curl -O https://raw.githubusercontent.com/cervonwong/ILSpy-MCP/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/cervonwong/ILSpy-MCP

Made for: Claude Code.

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/cervonwong/ilspy-mcp/claude-md/github.svg)](https://agentmods.dev/instructions/cervonwong/ilspy-mcp/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/cervonwong/ilspy-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/cervonwong/ilspy-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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/cervonwong/ilspy-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/cervonwong/ilspy-mcp/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 3,048 This file is loaded in full into every session.

When invoked 3,048 The same file — it is already loaded in full.

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.

Token cost

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	$0.03048	$0.03048
Opus 5.5	$0.01219	$0.01219
Sonnet 5.5	$0.00610	$0.00610
Haiku 4.5	$0.00305	$0.00305

Measured 2mo ago against content hash 04df446320d8, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

ILSpy-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 2mo 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.

CLAUDE.md · 153 lines

How it starts

The opening of the file, as written. The whole thing — 153 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Project

ILSpy MCP — Feature Parity

An MCP (Model Context Protocol) server that exposes ILSpy's .NET decompilation and static analysis capabilities as tools for AI assistants. Currently has 8 tools covering basic type inspection (~25-30% of ILSpy GUI functionality). This milestone extends it to full reverse engineering feature parity — cross-reference tracing, IL output, assembly metadata, string search, resource extraction, and bulk decompilation.

Core Value: AI assistants can perform complete .NET static analysis workflows — not just read code, but trace execution, find usages, search strings, and navigate across types and assemblies.

Constraints

Tech stack: C#, .NET, ICSharpCode.Decompiler, System.Reflection.Metadata, MCP SDK — no new runtime dependencies
Architecture: Follow existing layered pattern (Domain/Infrastructure/Application/Transport)
Testing: Critical-path tests for P0 features and all bug fixes to ensure nothing breaks
Compatibility: Must not break existing 8 tools during upgrades

Technology Stack

Current Stack (Baseline)

Technology	Current Version	Target Version	Breaking?
ICSharpCode.Decompiler	9.1.0.7988	10.0.0.8330	YES
ModelContextProtocol	0.4.0-preview.3	1.2.0	YES
Microsoft.Extensions.Hosting	8.0.0	10.0.0	Minor
.NET Runtime	net9.0	net9.0 (keep)	NO
xUnit	2.9.2	2.9.3 (keep v2)	NO
FluentAssertions	8.8.0	8.9.0	NO

Recommended Stack

Core Decompilation

Technology	Version	Purpose	Why
ICSharpCode.Decompiler	10.0.0.8330	C# decompilation, IL disassembly, type system	Just released (2026-04-06). Still targets netstandard2.0, compatible with net9.0. Adds `IDecompilerTypeSystem` interface on `CSharpDecompiler` constructor for better testability, new `ExpandParamsArguments` and `AlwaysMoveInitializer` settings.
System.Reflection.Metadata	9.0.0+ (transitive)	IL scanning, metadata reading, cross-reference analysis	Comes transitively via ICSharpCode.Decompiler. Provides `MetadataReader`, `MethodBodyBlock.GetILReader()`, `ILOpCode` enum, `BlobReader` for raw IL bytecode scanning. This is the engine for string search (`ldstr`), constant search (`ldc.*`), and cross-reference tracing.

Read the full file on GitHub · 153 lines

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.

2mo ago First seen · 153 lines · 3,048 tokens per session scan A 04df446320d8

Subscribe to this mod's changes

ILSpy-MCP CLAUDE.md is an instructions file published in the GitHub repository cervonwong/ILSpy-MCP (35 stars, last pushed 3mo ago), licensed MIT. It adds 3,048 tokens to every session, about $0.0122 per session on Opus 5.5. 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.

ILSpy-MCP CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
ILSpy-MCP CLAUDE.mdcervonwong/ILSpy-MCP	Instructions file	35	3mo ago	MIT	A	3,048	Claude Code
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

ILSpy-MCP: Instructions file for Claude Code