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AI Feature Impact Analyzer™
Map every code, API, database, test, and dependency affected by a feature change before implementation.
$19.99
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See it in action
You say
I want to add a subscription cancellation feature.
Requirements:
- Users can cancel immediately.
- Users can also cancel at the end of their billing period.
- Cancelled subscriptions should not renew.
- Users should retain access until the end of the paid period when they choose end-of-period cancellation.
- Admins should be able to see the cancellation status.
Before I change any code, analyze the repository and tell me:
- Every file/module likely affected.
- API endpoints that need changes.
- Database tables/fields that may need changes.
- Frontend components that may need changes.
- Authentication/authorization implications.
- Payment/webhook dependencies.
- Existing tests that cover related behavior.
- Tests that are missing.
- Breaking-change risks.
- The safest implementation order.
Do not modify any files.
Only report findings supported by repository evidence. Clearly label inferred or unverified findings.
Your agent does
AI FEATURE IMPACT ANALYZER™ ━━━━━━━━━━━━━━━━━━━━━━━━━━
FEATURE: Subscription Cancellation
ANALYSIS STATUS: COMPLETED
CONFIDENCE: HIGH
OVERALL IMPACT: HIGH
━━━━━━━━━━━━━━━━━━━━━━━━━━
- IMPACT SUMMARY ━━━━━━━━━━━━━━━━━━━━━━━━━━
Estimated affected areas:
Backend: 7 modules Frontend: 4 components Database: 2 tables API: 3 endpoints Tests: 11 existing Missing tests: 6 External flow: Payment webhook
━━━━━━━━━━━━━━━━━━━━━━━━━━ 2. DATABASE IMPACT ━━━━━━━━━━━━━━━━━━━━━━━━━━
HIGH
Affected:
subscriptions subscription_events
Evidence: subscriptions contains status and renewal-related fields.
Potential changes:
• cancellation_status • cancelled_at • cancel_at_period_end
Risk: HIGH
Reason: Incorrect state handling could cause unintended renewals or premature access removal.
━━━━━━━━━━━━━━━━━━━━━━━━━━ 3. API IMPACT ━━━━━━━━━━━━━━━━━━━━━━━━━━
POST /api/subscription/cancel
Status: LIKELY NEW
Evidence: Existing subscription management routes found.
GET /api/subscription/status
Status: AFFECTED
Reason: Frontend currently consumes subscription status.
━━━━━━━━━━━━━━━━━━━━━━━━━━ 4. FRONTEND IMPACT ━━━━━━━━━━━━━━━━━━━━━━━━━━
billing/SubscriptionPanel → cancellation UI required
components/SubscriptionStatus → cancellation state required
components/CancelConfirmation → likely new component
━━━━━━━━━━━━━━━━━━━━━━━━━━ 5. PAYMENT IMPACT ━━━━━━━━━━━━━━━━━━━━━━━━━━
HIGH
Detected:
payment webhook handler
Potential dependency: Subscription cancellation state may need to remain synchronized with payment-provider events.
IMPORTANT: External provider behavior could not be fully verified from the repository.
Status: UNVERIFIED
━━━━━━━━━━━━━━━━━━━━━━━━━━ 6. AUTHORIZATION ━━━━━━━━━━━━━━━━━━━━━━━━━━
Admin cancellation visibility requires authorization review.
Existing admin middleware: FOUND
Status: VERIFIED
━━━━━━━━━━━━━━━━━━━━━━━━━━ 7. TEST IMPACT ━━━━━━━━━━━━━━━━━━━━━━━━━━
Existing relevant tests: 11
Missing scenarios:
❌ Immediate cancellation ❌ End-of-period cancellation ❌ Duplicate cancellation request ❌ Unauthorized cancellation ❌ Webhook after cancellation ❌ Subscription already expired
Priority: HIGH
━━━━━━━━━━━━━━━━━━━━━━━━━━ 8. BREAKING-CHANGE RISKS ━━━━━━━━━━━━━━━━━━━━━━━━━━
🔴 HIGH Subscription state transitions
🟠 MEDIUM API response changes
🟠 MEDIUM Frontend subscription-status handling
🟡 LOW Admin display changes
━━━━━━━━━━━━━━━━━━━━━━━━━━ 9. RECOMMENDED IMPLEMENTATION ORDER ━━━━━━━━━━━━━━━━━━━━━━━━━━
- Define subscription state transitions
- Update database model/migration
- Update subscription service
- Implement cancellation API
- Synchronize webhook behavior
- Update authorization rules
- Update frontend state
- Add regression tests
- Run complete subscription test suite
- Review API compatibility
━━━━━━━━━━━━━━━━━━━━━━━━━━ 10. FINAL VERDICT ━━━━━━━━━━━━━━━━━━━━━━━━━━
IMPLEMENTATION READINESS: REVIEW REQUIRED
Why:
The repository clearly shows subscription state and payment dependencies, but external payment-provider cancellation behavior is not fully verifiable from local files.
DO NOT START IMPLEMENTATION UNTIL:
✓ State transitions are finalized ✓ Payment-provider behavior is confirmed ✓ Missing cancellation tests are planned ✓ Migration strategy is defined
What you get
About this skill
AI Feature Impact Analyzer™ analyzes a requested feature or change against the actual repository and produces an evidence-backed Feature Impact Map before development begins.
Instead of asking an AI agent to immediately modify code, this skill first determines what the requested change can affect, where those dependencies live, what could break, and what should be changed or tested.
It analyzes:
Repository architecture Relevant source files Components and modules API endpoints Database tables and relationships Authentication and authorization paths External integrations Configuration and environment variables Shared utilities Dependencies Existing tests Documentation Frontend/backend contracts Event and webhook flows Feature flags Potential breaking changes Core workflow
Feature Request → Repository Discovery → Dependency Mapping → Impact Analysis → Risk Assessment → Test Impact → Implementation Order → Change Plan
For each affected area, the skill reports:
What is affected Why it is affected Evidence Risk level Potential regression Required tests Recommended implementation order Example
For:
“Add subscription cancellation with immediate and end-of-period cancellation.”
The skill can identify:
DATABASE
├── subscriptions ├── subscription_events └── billing_history
BACKEND
├── cancellation API ├── webhook handler ├── authorization └── billing service
FRONTEND
├── billing page ├── confirmation modal └── subscription status
TESTS
├── API tests ├── payment tests ├── authorization tests └── UI tests
It then identifies hidden dependencies, breaking-change risks, missing tests, and the safest implementation sequence.
Evidence-first analysis
The skill must distinguish:
VERIFIED — supported by repository evidence.
INFERRED — likely based on repository structure but not directly confirmed.
UNVERIFIED — required evidence was unavailable.
It must never invent affected files, dependencies, test coverage, API relationships, or database relationships.
What makes it different
This is not a generic code review tool.
A code reviewer asks:
“Is the existing code good?”
Feature Impact Analyzer asks:
“If we change this, what else can this change affect?”
The result is a concrete implementation-impact map that developers can use before writing code.
Safety
The default workflow is read-only analysis.
It should not modify production code, delete files, alter databases, install dependencies, or execute destructive commands unless the user explicitly requests those actions.
How to install
Drop the file into your AI Agent. Works with Claude, Cursor, ChatGPT, and 20+ more.
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