impact

name	impact
description	Analyzes the blast radius and risk level before modifying any file. Run this skill before touching production code, before refactoring, and before changing core logic. It is mandatory for files under payment, auth, billing, and security paths. Triggers on /impact, "impact analysis", or "what does changing this file affect?"
version	1.1.0
updated	"2026-02-11T00:00:00.000Z"

Impact Analyzer

Analyzes impact scope, risk level, and related tests before modifying a file to support safe changes.

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Trigger Conditions

• /impact <file-path>
• /impact analyze <file-path>
• "What does changing this file affect?"
• "Run an impact analysis"

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Absolute Prohibitions

1. Do not modify code directly — this skill is analysis-only.
2. Do not guess dependencies — always parse actual import/require statements.
3. Do not assert risk level without analysis — verify both file path patterns and actual dependencies.

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Execution Steps

Receive /impact <file-path>
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[1] Validate target file
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[2] Risk classification
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[3] Direct dependents analysis
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[4] Indirect dependents analysis
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[5] Identify affected domains
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[6] Locate related tests
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[7] Determine recommended reviewers
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[8] Output impact report

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Step 1: Validate Target File

Confirm file existence and type (supported: .py, .js, .ts, .jsx, .tsx, .vue, .svelte)

Step 2: Risk Classification

Classify risk based on file path patterns.

Risk Level	Pattern	Required Action
CRITICAL	payment, billing, auth, security, crypto, jwt, password	Full test suite + mandatory review
HIGH	services/*, core/, middleware/, shared/	Run related test suite
MEDIUM	api/, routes/, models/, schemas/	Verify contract compatibility
LOW	tests/, utils/, config/, docs/	Standard review

Custom configuration: If .claude/risk-areas.yaml exists, it takes priority.

Step 3: Direct Dependents Analysis

Find all files that import or require the target file.

# Python
grep -rn "from.*<module-name>|import.*<module-name>" --include="*.py" .

# JS/TS
grep -rn "from.*<module-name>|require.*<module-name>" --include="*.ts" --include="*.js" .

Step 4: Indirect Dependents Analysis

If the target file defines API endpoints, find files that call those APIs.

Type	Description	Discovery Method
API calls	Clients calling the endpoint	grep for API path strings
Event subscriptions	Files publishing/subscribing to events	grep for event names

Step 5: Identify Affected Domains

Identify affected domains from dependency analysis results.

• Based on directory structure: domains/<domain-name>/, src/<domain-name>/
• Domain definitions in .claude/project-team.yaml take priority if present

Step 6: Locate Related Tests

Source File	Search Targets
user_service.py	test_user_service.py, user_service_test.py
userService.ts	userService.test.ts, userService.spec.ts

Step 7: Determine Recommended Reviewers

Risk Level	Recommended Reviewer
CRITICAL	QA Manager + Chief Architect
HIGH	Part Leader (relevant domain)
MEDIUM	Domain Developer
LOW	Standard code review

Cross-domain impact: Add the Part Leader of every affected domain.

Step 8: Output Impact Report

See references/output-formats.md for detailed output format.

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Hook Integration

	Hook (pre-edit-impact-check.js)	Skill (/impact)
Timing	Auto-runs on Edit	On user request
Scope	Single file summary	Detailed analysis + recommendations
Purpose	Real-time warning	Pre-change planning

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Related Skill Integration

Skill	When to Use	Purpose
/deps <domain>	When cross-domain impact is found	Visualize domain dependencies
/coverage <file>	After reviewing related tests	Detailed test coverage check
/changelog <domain>	After change is complete	Review change history record

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Reference Documents

• references/output-formats.md — detailed output format
• references/examples.md — usage examples