Clr Activation Debugging
Clr Activation Debugging is an agent skill (a SKILL.md file) from dotnet/skills. Diagnoses .NET Framework CLR activation issues using CLR activation logs (CLRLoad logs) produced by mscoree.dll. 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/clr-activation-debugging (opens in a new tab)
Data as of from the GitHub API; description from the skill's SKILL.md. Report an error
- Official
- Multi-skill repo
- Plugin marketplace
- Testing & QA
- 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 clr-activation-debugging 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/clr-activation-debugging .agents/skills/clr-activation-debugging # 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/clr-activation-debugging .cursor/skills/clr-activation-debugging # 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
Diagnoses .NET Framework CLR activation issues using CLR activation logs (CLRLoad logs) produced by mscoree.dll. Use when: the shim picks the wrong runtime, fails to load any runtime, shows unexpected .NET 3.5 Feature-on-Demand (FOD) dialogs, unexpectedly does NOT show FOD dialogs, loads both v2 and v4 into the same process causing failures, or any time someone is wondering "what is happening with .NET Framework activation?" Diagnose .NET Framework runtime activation issues by analyzing CLR…
When it triggers
- Use when: the shim picks the wrong runtime, fails to load any runtime, shows unexpected .
- "what is happening with .NET Framework activation?"
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How do I install the Clr Activation Debugging 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 clr-activation-debugging folder into .agents/skills/ or .cursor/skills/.
Is the Clr Activation Debugging skill free?
Yes. The repository is open source under the MIT license.
Is Clr Activation Debugging 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.