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Blast Radius

Blast Radius is an agent skill (a SKILL.md file) from michael-denyer/pstack-claude. Find what a change could break somewhere else before it ships, beyond the diff, and prove the one fact it's safe because… It works with Claude Code, Codex, Cursor, Gemini CLI, GitHub Copilot and OpenCode and has 1,554 GitHub stars across a repository of 2 listed skills.

github.com/michael-denyer/pstack-claude/plugins/pstack/skills/blast-radius (opens in a new tab)

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 michael-denyer/pstack-claude
/plugin install pstack@pstack-claude

In the Claude apps, zip the blast-radius 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/michael-denyer/pstack-claude.git
cp -r pstack-claude/plugins/pstack/skills/blast-radius .agents/skills/blast-radius   # 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/michael-denyer/pstack-claude.git
cp -r pstack-claude/plugins/pstack/skills/blast-radius .cursor/skills/blast-radius   # 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

Find what a change could break somewhere else before it ships, beyond the diff, and prove the one fact it's safe because of by running real code instead of writing it up. Use for 'blast radius of X', 'what could this break', reviewing a small diff you don't trust, or a brief that asserts something about existing code ('make X public', 'X already handles Y') before you design against that assertion. Find what a change breaks somewhere else, before it ships.

When it triggers

  • Use for 'blast radius of X', 'what could this break', reviewing a small diff you don't trust, or a brief that asserts something about existing code ('make X public', 'X already handles Y') before you design against that assertion.

More skills in michael-denyer/pstack-claude

2 skills are listed from this repository.

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More docs & writing skills

All Docs & writing

FAQ

Blast Radius FAQ

Still curious? Email info@appsgit.com.

What is the Blast Radius skill?

Blast Radius is an agent skill (a SKILL.md file) from michael-denyer/pstack-claude. Find what a change could break somewhere else before it ships, beyond the diff, and prove the one fact it's safe because… It works with Claude Code, Codex, Cursor, Gemini CLI, GitHub Copilot and OpenCode and has 1,554 GitHub stars across a repository of 2 listed skills. Its SKILL.md lives at github.com/michael-denyer/pstack-claude/plugins/pstack/skills/blast-radius.

How do I install the Blast Radius skill?

In Claude Code, run /plugin marketplace add michael-denyer/pstack-claude and then /plugin install pstack@pstack-claude. For Codex or Cursor, copy the blast-radius folder into .agents/skills/ or .cursor/skills/.

Is the Blast Radius skill free?

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

Is Blast Radius maintained?

The repository's most recent commit was on Oct 6, 2026. Its latest release is v0.9.74. appsgit only lists skills from repositories with a commit in the last six months.