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 5,568 GitHub stars across a repository of 4 listed skills.
- Official
- Multi-skill repo
- Plugin marketplace
- Coding
- Actively maintained
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-skillsIn 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 projectsStandalone 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 projectsSource (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 .
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What is the Analyzing Dotnet Performance skill?
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 5,568 GitHub stars across a repository of 4 listed skills. Its SKILL.md lives at github.com/dotnet/skills/plugins/dotnet-diag/skills/analyzing-dotnet-performance.
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 6, 2026. Its latest release is v1.0.0. appsgit only lists skills from repositories with a commit in the last six months.