Change impact check

Skill yeaight7/agent-powerups/skills/change-impact-check

Use before submitting a PR or considering a task done to evaluate the blast radius of your changes -- you touched a public signature, a shared utility, a schema, or added config and need to know what else is affected.From its SKILL.md

Install

npx -y skills add yeaight7/agent-powerups --skill change-impact-check

Assembled from the repository path, not quoted from the project. Check it against their README if it does not work.

2 things to look at

6 stars6 stars. Stars are a popularity signal and not a quality one, but at this level it is likely that nobody has read this closely except its author, and you would be relying on your own review.
runs commandsInstructs the agent to run 7 commands, including `git diff --stat` and 6 more.

SKILL.md

3.5 KB, 718 tokens by cl100k_base, as published. Nobody here has run it

Purpose

Code changes rarely exist in isolation. Before declaring success, evaluate the downstream consequences of your work: what depends on what you changed, and whether those dependents still hold.

When to Use

Before submitting a PR or marking a task complete
You changed a public method signature, REST endpoint, or database schema
You modified a shared utility, core helper, or widely-imported module
You added or renamed an environment variable or config key

Inputs

The diff of your changes (staged or committed)
Access to the repository to search for callers and run tests

Workflow

Scope the diff. List what actually changed and which files are touched, so you know where to look for fallout.

git diff --stat            # files changed + churn size
git diff --name-only       # bare list to feed into searches

API surface. If you changed a public method signature, REST endpoint, or database schema, search the entire repository for usages of the old signature. Every caller is a potential break.
```
git grep -n "oldFunctionName"   # all references, with line numbers
git grep -nw "endpointPath"     # whole-word match for a route/symbol
```
Dependency graph. If you updated a core utility (e.g., a date formatter), find every module that imports it and confirm their tests still pass. Inspect the dependency tree if a third-party package version moved.
```
git grep -n "from '.*utils/date'"   # or the ecosystem equivalent import pattern
npm ls some-package                 # or the ecosystem equivalent dependency tree
```
Configuration. If you added or renamed an environment variable, ensure it is documented in the example env file (e.g. .env.example) or the README, and that defaults exist where code reads it.
Act on the blast radius. If the impact is wide, run the full test suite (not just local unit tests) rather than the narrow subset, and explicitly document the affected areas in your handoff or PR description.
```
npm test                            # or the ecosystem equivalent full suite
```

Output

A blast-radius assessment per dimension (API surface, dependency graph, configuration)
The list of affected callers/modules and whether their tests pass
A note in the PR description or handoff documenting wide-impact areas

Verification

Old signatures/endpoints/schemas searched repo-wide for remaining usages
Importers of any changed shared utility identified and their tests confirmed passing
New or renamed config documented in the example env file or README
Full test suite run (not just local units) when blast radius is high
Affected areas documented in the PR description or handoff

Failure Modes

Narrow test run — running only the local unit tests on a wide change; high blast radius demands the full suite.
Missed callers — searching one directory or one spelling; grep the whole repo, including whole-word and import-path variants.
Silent config break — adding an env var without documenting it or providing a default, so other environments fail at runtime.
Declaring done too early — calling the task complete before checking downstream consequences at all.

What ships with it

Read from the repository

Just SKILL.md. No reference files, no scripts.

Gives 0 of the 12 instructions most quality gates skills give in 718 tokens

Counted across 1,524 of the 2,830 authors here whose files we hold, read 2026-09-06

Read full output and check exit codein 45 of 1524, across 40 files
Verify output confirms the claimin 44 of 1524, across 39 files
Identify the command that proves the claimin 43 of 1524, across 39 files
Execute the full verification commandin 36 of 1524, across 30 files
Produce a verification reportin 34 of 1524, across 18 files
Review git diff changesin 30 of 1524, across 16 files
Fix build failures immediatelyin 29 of 1524, across 9 files
Group findings by severityin 28 of 1524
State claim only with evidencein 27 of 1524, across 22 files
Verify regression tests with red-green cyclein 26 of 1524, across 22 files
Run the full test suitein 26 of 1524, across 25 files
Run test suite with coveragein 25 of 1524, across 10 files

Said here and by no other author read

List changed files and churn size
Search repository for usages of changed signatures
Identify all modules importing modified utilities
Document new configuration in example files
Run full test suite for wide impact changes
Document affected areas in PR description

Grouped from the skills themselves: near-identical wordings counted once, and counted by distinct author, so one author publishing three of these counts once. Length counted with cl100k_base; the agent that loads this file may tokenize it differently.