mcaf-dotnet-quickdup

A setup for QuickDup, a free tool that finds repeated or structurally similar C# code.

In plain words
What is it for?
Use it to scan a solution, project, or source folder for duplicate code and run duplication checks locally or in CI.
Why use it?
It makes copy-pasted logic and possible DRY refactoring targets easier to find through repeatable scans.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/managedcode/dotpilot/mcaf-dotnet-quickdup
Any agent
npx skills add managedcode/dotPilot --skill mcaf-dotnet-quickdup
Clone the repo
git clone --depth 1 https://github.com/managedcode/dotPilot

Made for: Claude Code, Codex.

Per session 56 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,312 The whole file, excluding the scripts and references it only reads on demand.
Security scan C 2 findings. Scan, not verified.
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.

ModelPer sessionOnce invoked
Fable 5 $0.00056 $0.01312
Opus 5 $0.00028 $0.00656
Sonnet 5 $0.00011 $0.00262
Haiku 4.5 $0.00006 $0.00131

Measured 2d ago against content hash c5b43b132ac4, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade C, and why

mcaf-dotnet-quickdup scanned grade C with 2 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.

Downloads and executes remote codehighSupply chain

curl | sh runs whatever the server returns today, which is not necessarily what it returned when this was reviewed.

- official macOS/Linux fallback: `curl -sSL https://raw.githubusercontent.com/asynkron/Asynkron.QuickDup/main/install.sh | bash`

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

- official macOS/Linux fallback: `curl -sSL https://raw.githubusercontent.com/asynkron/Asynkron.QuickDup/main/install.sh | bash`
Origin

Copies of this mod

1 near-identical copy found in the catalogue:

.codex/skills/mcaf-dotnet-quickdup/SKILL.md · 132 lines

How it starts

The opening of the file, as written. The whole thing — 132 lines — stays where its author put it; the contents beside it link to each section on GitHub.

MCAF: .NET QuickDup

Trigger On

  • the repo wants QuickDup
  • the team needs repeatable duplicate-code scans for C#
  • the user asks about DRY cleanup, copy-paste detection, clone detection, or duplicate logic removal in a .NET repo

Value

  • produce a concrete project delta: code, docs, config, tests, CI, or review artifact
  • reduce ambiguity through explicit planning, verification, and final validation skills
  • leave reusable project context so future tasks are faster and safer

Do Not Use For

  • formatting-only work
  • repos that intentionally use a different clone detector and do not want overlap
  • generated-code churn where duplication findings would mostly be noise

Inputs

  • the nearest AGENTS.md
  • target solution, project, or source subtree
  • current duplication hotspots and generated-code boundaries

Quick Start

  1. Read the nearest AGENTS.md and confirm scope and constraints.
  2. Run this skill's Workflow through the Ralph Loop until outcomes are acceptable.
  3. Return the Required Result Format with concrete artifacts and verification evidence.

Workflow

  1. Choose the scan target deliberately:
    • whole solution for broad discovery
    • bounded folders for targeted cleanup
  2. Scan C# with .cs only unless the repo explicitly wants Razor, generated XML, or other extensions too.
  3. Exclude generated and transient paths before trusting the results:
    • bin/
    • obj/
    • Migrations/ when scaffold churn dominates
    • *.g.cs
    • *.generated.cs
    • *.Designer.cs
  4. Review the top patterns before refactoring anything.
  5. Classify duplication before changing code:
    • real structural duplication worth extraction
    • domain-shape duplication that documents intent
    • generated or acceptable duplication that should be ignored
  6. Prefer small extractions, named helpers, shared value objects, or focused abstractions over flag-heavy merge methods.
  7. Re-run QuickDup after the refactor and then run the repo's normal quality pass.

Read the full file on GitHub · 132 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

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 First seen · 132 lines · 56 tokens per session scan C c5b43b132ac4

Subscribe to this mod's changes

mcaf-dotnet-quickdup is a skill published in the GitHub repository managedcode/dotPilot (23 stars, last pushed 4mo ago), licensed MIT. It adds 56 tokens to every session and 1,312 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it C with 2 findings (downloads and executes remote code, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.