Blast Radius mod
Holds a risky shell command such as rm -rf or a force push and shows what it would change, with Proceed and Cancel buttons.
Last checked against the official docs: 2026-10-02
| Type | Official sample |
|---|---|
| Source | claude-code-playground · blast-radius |
What it does
- Catches rm -r / -f / -rf, git reset --hard, git checkout -- . and git restore ., git clean, git push --force (and its variants), and common database migration commands.
- For each, it measures what would be affected: files to be deleted with count and size, files with uncommitted changes, untracked paths, remote commits a force push would drop, or pending migrations.
- Proceed runs the command; Cancel refuses it and tells Claude why. Every other command runs as normal.
- On narrow terminals the report is drawn above the prompt instead of in a pane.
How to get it
- Clone anthropics/claude-code-playground and run Claude Code with --plugin-dir pointed at claude-code/mods/blast-radius.
- Or add the clone's claude-code/mods folder as a marketplace and install it.
What you can learn from its code
If you are writing your own mod, this one is a good example of:
- Holding a tool.call until the user decides
- Returning a deny with a reason
- Running measurements with $.process.run
See how to create a mod to get started.
Related mods
- sec-default: A guard for organizations: keeps managed hooks, managed CLAUDE.md, settings and deny rules out of reach of the mods a person installs.
- Secret Redactor: Masks API keys, JWTs, private keys and connection strings in tool output before Claude sees them.
- Large Edit Confirmation: Asks you to confirm before a large Edit or Write. Without an interface to ask, it refuses.
- Protected Paths Guard: Protects files matching path patterns from Edit, Write and notebook changes.