# Blast Radius (agent 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.

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.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/michael-denyer/pstack-claude |
| Skill path | plugins/pstack/skills/blast-radius/SKILL.md |
| Skill name | blast-radius |
| GitHub stars | 1,554 |
| Installs on skills.sh | not listed |
| License | MIT |
| Skills in repo | 2 |
| Plugin marketplace | pstack-claude |
| Official | no |
| Works with | Claude Code, Codex, Cursor, Gemini CLI, GitHub Copilot, OpenCode |
| Category | Docs & writing |
| Last commit | Oct 6, 2026 |

## 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.

## Add this skill

### Claude Code

```sh
/plugin marketplace add michael-denyer/pstack-claude
/plugin install pstack@pstack-claude
```

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

### ChatGPT / Codex

```sh
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
```

### Cursor

```sh
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
```

Sources (checked 2026-10-07): https://code.claude.com/docs/en/skills, https://support.claude.com/en/articles/12512180-using-skills-in-claude, https://learn.chatgpt.com/docs/build-skills, https://cursor.com/docs/context/skills

---

Canonical page: https://appsgit.com/skills/michael-denyer-blast-radius
Source: appsgit (https://appsgit.com), the app store for github. Data from the GitHub API, refreshed nightly.
Machine access: JSON API https://appsgit.com/api/v1/apps (OpenAPI: https://appsgit.com/openapi.json), MCP server https://mcp.appsgit.com/mcp, full index https://appsgit.com/llms-full.txt.