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Agent skill

Decompiler MCP

by pardeike in pardeike/DecompilerServer

A skill your agent uses when working with the DecompilerServer MCP server to inspect, search, decompile, analyze, or compare .NET assemblies, especially foreign code such as Unity/RimWorld…

MITAuto-check passedGame Development

Install Decompiler MCP

skills CLI
$ npx skills add pardeike/DecompilerServer --skill decompiler-mcp -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install pardeike/DecompilerServer decompiler-mcp --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/pardeike/DecompilerServer.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/decompiler-mcp .claude/skills/decompiler-mcp && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
decompiler-mcp
GitHub stars
105
Token cost
~1.5k tokens
SKILL.md length
669 words
Files
2
Skills in repo
1
Repo updated
First seen
Licence
MIT

At a glance

A skill your agent uses when working with the DecompilerServer MCP server to inspect, search, decompile, analyze, or compare .NET assemblies, especially foreign code such as Unity/RimWorld…

  • Works in 6 steps: Load or confirm context → Discover symbols → Inspect type surface → …
  • Working with the DecompilerServer MCP server to inspect
  • SKILL.md covers Default Workflow, Recovery Rules and Tool Choice Bias
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Decompiler MCP is an agent skill from pardeike/DecompilerServer. Use when working with the DecompilerServer MCP server to inspect, search, decompile, analyze, or compare .NET assemblies, especially foreign code such as Unity/RimWorld assemblies, third-party DLLs, game binaries, or version-to-version assembly diffs. Prefer this skill when choosing the right DecompilerServer tool sequence and avoiding premature shell fallbacks.

Its SKILL.md is about 1.5k tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files (for example `agents/openai.yaml`).

It sits in Game Development, covering Reverse engineering and malware and MCP servers. It works with Model Context Protocol and .NET. The repository describes itself as: A powerful MCP (Model Context Protocol) server for decompiling and analyzing .NET assemblies, with specialized support for Unity's Assembly-CSharp.dll files. DecompilerServer… The licence is MIT.

When your agent uses it

  • Working with the DecompilerServer MCP server to inspect
  • Compare .NET assemblies
  • Especially foreign code such as Unity/RimWorld assemblies
  • Third-party DLLs

Example prompts

  • “/decompiler-mcp”

Workflow steps

6 steps, taken from the first numbered list in SKILL.md.

  1. Load or confirm context
  2. Discover symbols
  3. Inspect type surface
  4. Read code
  5. Analyze relationships
  6. Compare versions

What it can do on your machine

Read from SKILL.md and the folder at commit 42c3f91. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Decompiler MCP loads about 1.5k tokens when it runs. Until then it costs about 95 tokens; SKILL.md has 669 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~95
When it runs · the whole SKILL.md, loaded when a task matches
~1.5k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from pardeike/DecompilerServer at commit 42c3f91, republished under its MIT licence (© pardeike). 669 words, ~1,462 tokens.

Download SKILL.mdSave it as .claude/skills/decompiler-mcp/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
decompiler-mcp
description
Use when working with the DecompilerServer MCP server to inspect, search, decompile, analyze, or compare .NET assemblies, especially foreign code such as Unity/RimWorld assemblies, third-party DLLs, game binaries, or version-to-version assembly diffs. Prefer this skill when choosing the right DecompilerServer tool sequence and avoiding premature shell fallbacks.

DecompilerServer MCP

Use DecompilerServer as the primary source of truth for loaded .NET assemblies. Do not guess member IDs or fall back to shell scans after one failed symbol lookup; use the discovery and diagnostic tools first.

Default Workflow

  1. Load or confirm context:
    • load_assembly with assemblyPath, or gameDir plus assemblyFile for Unity layouts.
    • status for readiness and the current context. Use list_contexts(includeRegistered: true, limit, cursor, filter) only to discover registered aliases. Passing contextAlias activates a registered alias on demand.
    • Use get_server_stats only when cache, index, or performance diagnostics matter.
  2. Discover symbols:
    • Use search_symbols first for fragments or when unsure whether a name is a type or member.
    • Use resolve_member_id first for fully-qualified or XML-doc-like guesses such as Namespace.Type.Member, Namespace.Type:Member, or M:Namespace.Type.Member.
    • Use search_types when looking only for types.
    • Use search_members when looking only for methods, fields, properties, or events.
  3. Inspect type surface:
    • Use list_members after resolving a type (get_members_of_type is its compatibility alias).
    • Prefer mode: "signatures" for orientation and mode: "full" only when extra metadata is needed.
    • Generated members and accessors are hidden by default; use includeCompilerGenerated: true when those are the subject of inspection.
  4. Read code:
    • Use get_decompiled_source for complete focused source.
    • Use plan_chunking and get_source_slice for large types or methods.
    • Batch source defaults to 50 lines per member (maxLinesPerMember). Partial entries have hasMore and nextStartLine; continue with a source slice. Outer truncated includes partial members; budgetTruncated specifically means the total character cap was reached.
  5. Analyze relationships:
    • Use find_callers, find_callees, and find_usages for call/use questions.
    • Callers/usages default to scope: "assembly"; use scope: "workspace" for all currently loaded contexts. Inspect searchedContexts; deferred aliases are not activated by that query.
    • Callees link exact members in other loaded contexts with resolution: "workspace"; external targets retain referenced assembly identity.
    • Use find_base_types, find_derived_types, get_overrides, and get_implementations for inheritance questions.
    • Type metadata outlines have addressable child IDs and limit/cursor paging; maxDepth: 0 omits children, and larger values show the direct member level.
    • Use get_il before proposing transpiler anchors; suggest_transpiler_targets should be treated as a real-IL hint list, not a substitute for reading IL.
  6. Compare versions:
    • Use compare_contexts for structural alias-level overview.
    • Use compare_symbols for type/member drill-down.
    • Use compare_symbols with compareMode: "body" only for method bodies.
Show full SKILL.md (303 more words)Show less

Recovery Rules

  • If it returns context_not_loaded or member_context_mismatch, follow the assembly-loading hint and retry the canonical ID in its owning context. Do not search the MVID or kind suffix as a symbol.
  • If it returns ambiguous_member, choose a candidate ID or supply the parameter types.
  • If a member-based tool returns type_not_found, call search_types or search_symbols with the type fragment.
  • If it returns member_not_found, inspect error.details.candidates and call the suggested get_members_of_type or search_symbols.
  • If search_symbols returns diagnostic.code: "member_guess_unresolved", the type resolved but the member guess did not; inspect the returned direct members or call the suggested list_members.
  • If it returns wrong_symbol_kind, switch to the tool for the actual kind instead of retrying the same call.
  • If a memberId contains an MVID, follow-up calls normally do not need contextAlias.
  • Use explicit contextAlias when working from human-entered symbols or when multiple versions are loaded and no canonical memberId has been resolved yet.

Tool Choice Bias

  • Output is compact by default. Complete source is in data.code; omitted source language means C#. Source slices retain startLine, endLine, and totalLines. Use structured IL instructions, and use error.details/error.hints for recovery. Ordinary member summaries identify symbols with declaringType + name; type summaries retain fullName.

  • Extended output is a user startup configuration (DECOMPILER_RESPONSE_MODE=extended), not a tool argument or an agent-controlled setting.

  • search_symbols beats broad shell search for unknown names.

  • resolve_member_id beats search_symbols for fully-qualified stale method guesses because its errors return typed candidates.

  • list_members beats guessing conventional method names.

  • get_source_slice beats dumping huge source into context when line ranges are enough.

  • get_il beats external IL tools for first-pass opcode inspection; use limit/cursor or startOffset/endOffset for large methods.

  • find_callees returns callee-shaped fields. Prefer targetMemberId, symbol, opcode, offset, and resolution over legacy inMember/inType aliases.

  • Shell tools are a last resort for files outside loaded assemblies or for validating packaging/runtime environment, not for ordinary symbol exploration.

© pardeike, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 1 other file in skills/decompiler-mcp of pardeike/DecompilerServer.

  • SKILL.md
  • agents/openai.yaml

Open the folder on GitHubat commit 42c3f91

Compare with similar skills

Decompiler MCP next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Decompiler MCP compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Decompiler MCP this skillpardeike/DecompilerServer105—~1.5kAutomated safety check: PassMIT
Fmodel Unpackpa001024/dna-builder134—~2.6kAutomated safety check: PassMIT
Roslynkmrpmorris/Roslynk122—~3kAutomated safety check: PassMIT
MCP Csharpatherio-danp/cde-dotnetcc109—~1.2kAutomated safety check: NotesNone
Creating Dotnet MCP ServersSebastienDegodez/copilot-instructions197—~1.3kAutomated safety check: PassApache-2.0
Windows CLIsbroenne/mcp-windows105—~1.8kAutomated safety check: PassMIT

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Works with

Categories

Questions about Decompiler MCP

What does Decompiler MCP do?

A skill your agent uses when working with the DecompilerServer MCP server to inspect, search, decompile, analyze, or compare .NET assemblies, especially foreign code such as Unity/RimWorld…. Decompiler MCP is an agent skill from pardeike/DecompilerServer.NET assemblies, especially foreign code such as Unity/RimWorld assemblies, third-party DLLs, game binaries, or version-to-version assembly diffs.

When should I use Decompiler MCP?

Decompiler MCP fits situations like: working with the DecompilerServer MCP server to inspect; compare .NET assemblies; especially foreign code such as Unity/RimWorld assemblies; third-party DLLs.

How do I install Decompiler MCP in Claude Code?

Run `npx skills add pardeike/DecompilerServer --skill decompiler-mcp -a claude-code`. Or copy the skill folder (skills/decompiler-mcp in pardeike/DecompilerServer) into .claude/skills/decompiler-mcp in your project. Claude Code loads it when a task matches its description.

How do I install Decompiler MCP in Codex?

Run `npx skills add pardeike/DecompilerServer --skill decompiler-mcp -a codex`. Or copy the skill folder (skills/decompiler-mcp in pardeike/DecompilerServer) into .agents/skills/decompiler-mcp in your project. Codex loads it when a task matches its description.

Can I use Decompiler MCP in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add pardeike/DecompilerServer --skill decompiler-mcp -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/decompiler-mcp, .gemini/skills/decompiler-mcp, .github/skills/decompiler-mcp and .opencode/skills/decompiler-mcp in your project.

What does Decompiler MCP need to run?

SKILL.md names no scripts, command-line tools or credentials: Decompiler MCP is instructions for the agent only.

Does Decompiler MCP access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Decompiler MCP safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Decompiler MCP use?

Decompiler MCP is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Decompiler MCP use?

About 1.5k tokens (SKILL.md is roughly 5.8k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Decompiler MCP?

Skills that share tags, products or a category with Decompiler MCP: Fmodel Unpack (pa001024/dna-builder, 134 stars), Roslynk (mrpmorris/Roslynk, 122 stars), MCP Csharp (atherio-danp/cde-dotnetcc, 109 stars) and Creating Dotnet MCP Servers (SebastienDegodez/copilot-instructions, 197 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Decompiler MCP?

pardeike (a GitHub user) maintains it in pardeike/DecompilerServer, which has 105 GitHub stars. The repository was last updated on October 1, 2026.

Source: pardeike/DecompilerServer on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.