What is mcaf-dotnet-coverlet?

Guidance for using coverlet, a free .NET tool that measures which lines and branches are exercised by tests.

Use it to set up line or branch coverage for .NET tests and choose between coverlet’s collector, MSBuild, or command-line options.

It helps a team choose a coverage method that matches its test runner and works reliably in continuous integration, the automated build and test system.

mcaf-dotnet-coverlet — Skill by managedcode

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-coverlet

Any agent

npx skills add managedcode/dotPilot --skill mcaf-dotnet-coverlet

Clone the repo

git clone --depth 1 https://github.com/managedcode/dotPilot

Made for: Claude Code, Codex.

Per session 47 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,073 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 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.

Model	Per session	Once invoked
Fable 5	$0.00047	$0.01073
Opus 5	$0.00023	$0.00536
Sonnet 5	$0.00009	$0.00215
Haiku 4.5	$0.00005	$0.00107

Measured 2d ago against content hash 04b3908d2c8c, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

mcaf-dotnet-coverlet 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.

Origin

Copies of this mod

3 near-identical copies found in the catalogue:

mcaf-dotnet-coverlet — 100% identical, 0 lines differ
dotnet-coverlet — 88% identical, 8 lines differ
dotnet-coverlet — 86% identical, 10 lines differ

.codex/skills/mcaf-dotnet-coverlet/SKILL.md · 113 lines

How it starts

The opening of the file, as written. The whole thing — 113 lines — stays where its author put it; the contents beside it link to each section on GitHub.

MCAF: .NET Coverlet

Trigger On

the repo uses or wants coverlet
CI needs line or branch coverage for .NET tests
the team needs to choose between coverlet.collector, coverlet.msbuild, or coverlet.console

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

coverage report rendering by itself
repos that intentionally use a different coverage engine

Inputs

the nearest AGENTS.md
active runner model: VSTest or Microsoft.Testing.Platform
target test projects

Quick Start

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

Workflow

Choose the driver deliberately:
- coverlet.collector for VSTest dotnet test --collect
- coverlet.msbuild for MSBuild property-driven runs
- coverlet.console for standalone scenarios
Add coverage packages only to test projects.
Do not mix coverlet.collector and coverlet.msbuild in the same test project.
Pair raw coverage collection with ReportGenerator only when humans need rendered reports.

Bootstrap When Missing

If coverage is not configured yet:

Detect current state:
- rg -n "coverlet\\.(collector|msbuild)|CollectCoverage|XPlat Code Coverage" -g '*.csproj' -g '*.props' -g '*.targets' .
- dotnet tool list --local
- dotnet tool list --global
- command -v coverlet
Install exactly one driver path:
- VSTest collector: dotnet add TEST_PROJECT.csproj package coverlet.collector
- MSBuild driver: dotnet add TEST_PROJECT.csproj package coverlet.msbuild
- Console tool: dotnet new tool-manifest (if missing) and dotnet tool install coverlet.console
Record one concrete local and CI command in AGENTS.md:
- collector: dotnet test TEST_PROJECT.csproj --collect:"XPlat Code Coverage"
- msbuild: dotnet test TEST_PROJECT.csproj /p:CollectCoverage=true /p:CoverletOutputFormat=cobertura
- console: dotnet tool run coverlet TEST_ASSEMBLY.dll --target "dotnet" --targetargs "test TEST_PROJECT.csproj --no-build"
Run the chosen command once and return status: configured or status: improved.
If another coverage engine already owns coverage for this repo, return status: not_applicable.

Read the full file on GitHub · 113 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.

references/coverlet.md 1.2 KB

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.

2d ago First seen · 113 lines · 47 tokens per session scan A 04b3908d2c8c

Subscribe to this mod's changes

mcaf-dotnet-coverlet is a skill published in the GitHub repository managedcode/dotPilot (23 stars, last pushed 4mo ago), licensed MIT. It adds 47 tokens to every session and 1,073 once invoked, about $0.0002 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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