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Analyzing Dotnet Performance

Analyzing Dotnet Performance is an agent skill (a SKILL.md file) from dotnet/skills. Scans .NET code for ~50 performance anti-patterns across async, memory, strings, collections, LINQ, regex, serialization, and I/O with tiered severity classification. It works with Claude Code, Codex, Cursor and GitHub Copilot and has 5,730 GitHub stars across a repository of 4 listed skills.

github.com/dotnet/skills/plugins/dotnet-diag/skills/analyzing-dotnet-performance (opens in a new tab)

Data as of from the GitHub API; description from the skill's SKILL.md. Report an error

View on GitHub (opens in a new tab)

Add this skill

Claude

This repository is a Claude Code plugin marketplace. In Claude Code:

/plugin marketplace add dotnet/skills
/plugin install dotnet-diag@dotnet-agent-skills

In the Claude apps, zip the analyzing-dotnet-performance folder and upload it under Customize > Skills > + > Upload a skill (code execution must be on).

ChatGPT / Codex

Codex reads skills from .agents/skills/ in a repo or ~/.agents/skills/ for every project:

git clone --depth 1 https://github.com/dotnet/skills.git
cp -r skills/plugins/dotnet-diag/skills/analyzing-dotnet-performance .agents/skills/analyzing-dotnet-performance   # repo; ~/.agents/skills for all projects

Standalone skills also load in the ChatGPT desktop app.

Cursor

Cursor loads skills from .cursor/skills/ (or ~/.cursor/skills/) and also reads .claude/skills/:

git clone --depth 1 https://github.com/dotnet/skills.git
cp -r skills/plugins/dotnet-diag/skills/analyzing-dotnet-performance .cursor/skills/analyzing-dotnet-performance   # project; ~/.cursor/skills for all projects

Source (checked Oct 7, 2026): code.claude.com/docs/en/skills (opens in a new tab), code.claude.com/docs/en/plugin-marketplaces (opens in a new tab), support.claude.com/en/articles/12512180-using-skills-in-claude (opens in a new tab), learn.chatgpt.com/docs/build-skills (opens in a new tab), cursor.com/docs/context/skills (opens in a new tab)

What this skill does

Scans .NET code for ~50 performance anti-patterns across async, memory, strings, collections, LINQ, regex, serialization, and I/O with tiered severity classification. Use when analyzing .NET code for optimization opportunities, reviewing hot paths, or auditing allocation-heavy patterns. Scan C#/.NET code for performance anti-patterns and produce prioritized findings with concrete fixes. Patterns sourced from the official .NET performance blog series, distilled to customer-actionable guidance.

When it triggers

  • Use when analyzing .

More skills in dotnet/skills

4 skills are listed from this repository.

Similar skills

More coding skills

All Coding

FAQ

Analyzing Dotnet Performance FAQ

Still curious? Email info@appsgit.com.

How do I install the Analyzing Dotnet Performance skill?

In Claude Code, run /plugin marketplace add dotnet/skills and then /plugin install dotnet-diag@dotnet-agent-skills. For Codex or Cursor, copy the analyzing-dotnet-performance folder into .agents/skills/ or .cursor/skills/.

Is the Analyzing Dotnet Performance skill free?

Yes. The repository is open source under the MIT license.

Is Analyzing Dotnet Performance maintained?

The repository's most recent commit was on Oct 22, 2026. Its latest release is v1.0.0. appsgit only lists skills from repositories with a commit in the last six months.