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Agent Skill

Migrate Nunit To Mstest skill

migrate-nunit-to-mstestdotnet/skillsplugins/dotnet-test-migration/skills/migrate-nunit-to-mstest/SKILL.md

Convert .NET tests from NUnit 3/4 to MSTest v4 while preserving VSTest or MTP. Use for replacing NUnit/NUnit3TestAdapter packages, Test/TestCase/ TestCaseSource/Values attributes, constraint assertions, SetUp/TearDown, OneTimeSetUp, SetUpFixture, FixtureLifeCycle, TestContext, categories, retries, timeouts, and NUnit parallelization. Also use when a "convert NUnit to MSTest" request may already be migrated: inspect and report the no-op. Do not use for NUnit version upgrades, xUnit/TUnit conversion, MSTest upgrades, or runner-only VSTest-to-MTP migration.

5.7kMIT

always on

144 tokname + description

once used

3,308 tokSKILL.md body

bundled files

117 KB

repo stars

5.7kGitHub

Install the Migrate Nunit To Mstest skill

Skills CLI (Claude Code, Codex, Cursor and others)

npx skills add https://github.com/dotnet/skills --skill migrate-nunit-to-mstest

Claude Code, by hand (all projects)

git clone --depth 1 https://github.com/dotnet/skills.git /tmp/skills
mkdir -p ~/.claude/skills
cp -R /tmp/skills/plugins/dotnet-test-migration/skills/migrate-nunit-to-mstest ~/.claude/skills/migrate-nunit-to-mstest

For one project only, copy the folder into .claude/skills/ in that project instead. The agent picks it up when a task matches its description.

What it costs your context

Agent Skills load in three steps. Tokens counted with the o200k tokenizer; your model's count will differ a little.

WhenWhat loadsCost
Every sessionName and description144 tok
When the agent uses itThe SKILL.md instructions3,308 tok
Only if opened1 bundled files (17 KB)varies

Until it is used, migrate-nunit-to-mstest costs about 9.5× less than the median MCP server we measured (1,362 tokens on every turn). Installing all 114 skills from dotnet/skills would load 15,432 tokens of descriptions. Skills vs MCP study

Checks

Our checks found nothing to flag: it follows the Agent Skills specification's naming and size guidelines and doesn't pipe downloads into a shell.

Checked 2026-10-22 · method

What's inside

The headings of its SKILL.md. Read the full file on GitHub.

  • NUnit -> MSTest Migration
  • Scope
  • Workspace Contract
  • Response Mode
  • Decisions That Change the Result
  • Fast Path
  • Workflow
  • 1. Establish the baseline
  • 2. Replace packages without switching runners
  • 3. Perform the mechanical conversion
  • 4. Resolve semantic mappings
  • 5. Preserve lifecycle and namespace setup
  • 6. Preserve parallelization and ordering
  • 7. Verify parity
  • Completion Criteria
  • Follow-up

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