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Agent skill

Coverlet

by managedcode in managedcode/dotnet-skills

Use the open-source free coverlet toolchain for .NET code coverage.

MITAuto-check passedAgent Workflows

Install Coverlet

skills CLI
$ npx skills add managedcode/dotnet-skills --skill coverlet -a claude-code

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

GitHub CLI
$ gh skill install managedcode/dotnet-skills coverlet --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/managedcode/dotnet-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/catalog/Testing/Coverlet/skills/coverlet .claude/skills/coverlet && 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
coverlet
GitHub stars
486
Token cost
~1.5k tokens
SKILL.md length
652 words
Files
5 (incl. references)
Skills in repo
81
Repo updated
First seen
Licence
MIT

At a glance

Use the open-source free coverlet toolchain for .NET code coverage.

  • Works in 3 steps: Read the nearest AGENTS.md and confirm… → Run this skill's Workflow through the… → Return the Required Result Format with…
  • A repo needs line and branch coverage
  • SKILL.md covers Diagnostic Output Budget, Trigger On, Value and Do Not Use For, plus 9 more sections
  • Calls dotnet and rg

What it does

Coverlet is an agent skill from managedcode/dotnet-skills. Use the open-source free coverlet toolchain for .NET code coverage. Use when a repo needs line and branch coverage, collector versus MSBuild driver selection, or CI-safe coverage commands. USE FOR: coverlet setup; CI line or branch coverage; choosing between collector and MSBuild drivers. DO NOT USE FOR: coverage report rendering by itself; repos that intentionally use a different coverage engine. INVOKES: inspect the repository context, edit targeted files, and run relevant build, test, lint, or validation…

Its SKILL.md is about 1.5k tokens, which your agent loads only when the skill is triggered. The skill folder holds 5 other files, including reference files (for example `manifest.json`, `references/commands.md` and `references/coverlet.md`). Compatibility notes: Requires a .NET test project or solution; respects the repo's AGENTS.md commands first.

It sits in Agent Workflows, covering Test coverage and Codebase knowledge for agents. It works with .NET. The repository describes itself as: Installable .NET skill catalog and CLI for Codex, Claude Code, GitHub Copilot, and Gemini. The licence is MIT.

When your agent uses it

  • A repo needs line and branch coverage
  • Collector versus MSBuild driver selection
  • CI-safe coverage commands
  • : coverlet setup

Example prompts

  • “/coverlet”

Requirements

  • Compatibility (from SKILL.md): Requires a .NET test project or solution; respects the repo's `AGENTS.md` commands first.

Workflow steps

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

  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.

What it can do on your machine

Read from SKILL.md and the folder at commit 535dd55. 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

    Shell commands in SKILL.md call:

    • dotnet
    • rg

    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.

  • Compatibility

    Requires a .NET test project or solution; respects the repo's `AGENTS.md` commands first.

    From compatibility in the SKILL.md frontmatter.

Context cost

Coverlet loads about 1.5k tokens when it runs, and up to ~5.7k if it reads all its reference files. Until then it costs about 139 tokens; SKILL.md has 652 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~139
When it runs · the whole SKILL.md, loaded when a task matches
~1.5k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~5.7k

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 managedcode/dotnet-skills at commit 535dd55, republished under its MIT licence (© managedcode). 652 words, ~1,467 tokens.

Download SKILL.mdSave it as .claude/skills/coverlet/SKILL.md (or your agent's skills folder). This skill also uses 4 other files; get the full folder from GitHub.
name
coverlet
description
Use the open-source free `coverlet` toolchain for .NET code coverage. Use when a repo needs line and branch coverage, collector versus MSBuild driver selection, or CI-safe coverage commands. USE FOR: coverlet setup; CI line or branch coverage; choosing between collector and MSBuild drivers. DO NOT USE FOR: coverage report rendering by itself; repos that intentionally use a different coverage engine. INVOKES: inspect the repository context, edit targeted files, and run relevant build, test, lint, or validation commands when changes are made.
compatibility
Requires a .NET test project or solution; respects the repo's `AGENTS.md` commands first.

Coverlet for .NET

Diagnostic Output Budget

Keep native test progress and ANSI visible; use the detected runner's supported flags (--progress on --ansi on for MTP/TUnit), not MTP switches on VSTest. Keep console logs at Warning or higher and one concise final summary. Do not replay progress redraws, successful-test output, or Information/Debug/Trace logs into model context. On failure/crash, show only the failing test/resource, root error, and relevant stack frames; deduplicate and cap each diagnostic response at 80 lines / 8 KiB. Never dump entire console/host/browser logs, HTML, TRX, or crash artifacts. Keep necessary artifacts size-bounded outside context, link them, and inspect exact bounded excerpts. Preserve the runner exit code through capture/filtering; disclose truncation. Silence alone does not establish a hang.

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

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

Bootstrap When Missing

If coverage is not configured yet:

  1. 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
  2. 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
  3. 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"
  4. Run the chosen command once and return status: configured or status: improved.
  5. If another coverage engine already owns coverage for this repo, return status: not_applicable.
Show full SKILL.md (222 more words)Show less

Deliver

  • explicit coverage driver selection
  • reproducible coverage commands for local and CI runs

Validate

  • coverage driver matches the runner model
  • coverage files are stable and consumable by downstream reporting

Ralph Loop

Use the Ralph Loop for every task, including docs, architecture, testing, and tooling work.

  1. Plan first (mandatory):
    • analyze current state
    • define target outcome, constraints, and risks
    • write a detailed execution plan
    • list final validation skills to run at the end, with order and reason
  2. Execute one planned step and produce a concrete delta.
  3. Review the result and capture findings with actionable next fixes.
  4. Apply fixes in small batches and rerun the relevant checks or review steps.
  5. Update the plan after each iteration.
  6. Repeat until outcomes are acceptable or only explicit exceptions remain.
  7. If a dependency is missing, bootstrap it or return status: not_applicable with explicit reason and fallback path.
Required Result Format
  • status: complete | clean | improved | configured | not_applicable | blocked
  • plan: concise plan and current iteration step
  • actions_taken: concrete changes made
  • validation_skills: final skills run, or skipped with reasons
  • verification: commands, checks, or review evidence summary
  • remaining: top unresolved items or none

For setup-only requests with no execution, return status: configured and exact next commands.

Load References

Example Requests

  • "Add Coverlet to this .NET solution."
  • "Choose the right Coverlet driver for CI."

© managedcode, 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 4 other files (references) in catalog/Testing/Coverlet/skills/coverlet of managedcode/dotnet-skills.

  • SKILL.md
  • manifest.json
  • references/commands.md
  • references/coverlet.md
  • references/patterns.md

Open the folder on GitHubat commit 535dd55

Compare with similar skills

Coverlet 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.

Coverlet compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Coverlet this skillmanagedcode/dotnet-skills486—~1.5kAutomated safety check: PassMIT
Mcaf Dotnet Coverletmanagedcode/Storage138—~1.1kAutomated safety check: PassMIT
Mcaf Dotnet Quality CImanagedcode/Storage138—~1.7kAutomated safety check: PassMIT
Mcaf Dotnet Strykermanagedcode/Storage138—~946Automated safety check: PassMIT
Evaluate PR Testsdotnet/maui23k—~2.9kAutomated safety check: PassMIT
Find Untested Sourcesdotnet/skills5.6k1 repos~3.3kAutomated safety check: PassMIT

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Works with

Categories

Questions about Coverlet

What does Coverlet do?

Use the open-source free coverlet toolchain for .NET code coverage. Coverlet is an agent skill from managedcode/dotnet-skills.NET code coverage.

When should I use Coverlet?

Coverlet fits situations like: A repo needs line and branch coverage; collector versus MSBuild driver selection; CI-safe coverage commands; : coverlet setup.

How do I install Coverlet in Claude Code?

Run `npx skills add managedcode/dotnet-skills --skill coverlet -a claude-code`. Or copy the skill folder (catalog/Testing/Coverlet/skills/coverlet in managedcode/dotnet-skills) into .claude/skills/coverlet in your project. Claude Code loads it when a task matches its description.

How do I install Coverlet in Codex?

Run `npx skills add managedcode/dotnet-skills --skill coverlet -a codex`. Or copy the skill folder (catalog/Testing/Coverlet/skills/coverlet in managedcode/dotnet-skills) into .agents/skills/coverlet in your project. Codex loads it when a task matches its description.

Can I use Coverlet 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 managedcode/dotnet-skills --skill coverlet -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/coverlet, .gemini/skills/coverlet, .github/skills/coverlet and .opencode/skills/coverlet in your project.

What does Coverlet need to run?

Going by SKILL.md and its folder, Coverlet needs the command-line tools its instructions call (dotnet and rg). Compatibility (from SKILL.md): Requires a .NET test project or solution; respects the repo's `AGENTS.md` commands first..

Does Coverlet 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 Coverlet 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 Coverlet use?

Coverlet 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 Coverlet use?

About 1.5k tokens (SKILL.md is roughly 5.9k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 4.3k tokens, read only when the agent opens those files.

What are the alternatives to Coverlet?

Skills that share tags, products or a category with Coverlet: Mcaf Dotnet Coverlet (managedcode/Storage, 138 stars), Mcaf Dotnet Quality CI (managedcode/Storage, 138 stars), Mcaf Dotnet Stryker (managedcode/Storage, 138 stars) and Evaluate PR Tests (dotnet/maui, 23k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Coverlet?

managedcode (a GitHub organization) maintains it in managedcode/dotnet-skills, which has 486 GitHub stars. The repository holds 81 skills in this directory. The repository was last updated on October 7, 2026.

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