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ds-blast-radius

Find what a change could break outside its own diff, then prove the key safety fact by running real code. Use before shipping a risky or untrusted change, for 'what could this break', 'blast radius of X', or /ds-blast-radius.

skills/ds-blast-radius/SKILL.md

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Oct 28, 2026
License
MIT

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# ds-blast-radius

Listing callers is easy. The job is finding the breakage that a text search will not show, and proving the change is safe with a run instead of an argument.

## Steps

1. Read the change: the diff, the symbols it adds, changes or removes, and the behavior it now has that the diff does not spell out.
2. Find the one or two facts the change is safe because of, for example "this only removes cache entries that are already expired". Most risk clears if that fact holds. Spend your effort here.
3. Look where search stops. Read the source of libraries you call at their pinned version. Check timing: async ordering, teardown, retries. Follow data that leaves the code: API responses, database columns, file formats, config, other languages reading the same data.
4. Grade each key fact by how far you proved it:
   1. you said so (worthless alone),
   2. you pointed at a real file and line,
   3. you traced the failure path and showed it cannot be reached,
   4. you ran a script or test against the real code that fails loudly if you are wrong,