Agent Commits

Examples

Real-world examples of Agent Commits showing different scenarios and levels of complexity.

Simple Bug Fix

Fixing a null pointer exception with proper error handling

[agent] fix: Resolve null pointer in user lookup

Intent: Fix crash when looking up deleted users

Plan:
- Add null check before accessing user properties
- Return appropriate error response for missing users
- Add test case for deleted user scenario

Changes:
- src/services/user.ts: Added null check in getUserById
- src/services/user.test.ts: Added test for deleted user lookup

Verified: All tests passing including new edge case test

New Feature

Adding CSV export functionality to a reports system

[agent] feat: Add CSV export for reports

Intent: User needs to export monthly reports as CSV files for accounting

Plan:
- Create CSV serialization utility
- Add export endpoint to reports API
- Include all report fields with proper escaping
- Add download button to reports UI

Changes:
- src/utils/csv.ts: New CSV serialization with proper escaping
- src/api/reports.ts: Added GET /reports/:id/export endpoint
- src/components/ReportView.tsx: Added export button
- src/utils/csv.test.ts: Unit tests for CSV edge cases

Verified: Manual export test successful, unit tests passing

Limitations:
- Large reports (>100k rows) may timeout; pagination not implemented
- Unicode characters preserved but not tested extensively

Refactoring

Modernizing async code from callbacks to async/await

[agent] refactor: Migrate from callbacks to async/await

Intent: Modernize the data layer to use async/await instead of callbacks

Plan:
- Convert callback-based functions to return Promises
- Update callers to use async/await syntax
- Maintain backward compatibility during transition
- Remove deprecated callback signatures

Changes:
- src/data/database.ts: Converted all methods to async
- src/data/cache.ts: Converted to async with Promise wrapper
- src/services/*.ts: Updated all database callers
- src/types/database.d.ts: Updated type definitions

Verified: All existing tests passing, no runtime errors in dev

Context: The codebase mixed callbacks and promises inconsistently.
This refactor standardizes on async/await throughout the data layer.

Alternatives:
- Could promisify incrementally, but creates inconsistent patterns
- Could use a library like Bluebird, but native promises sufficient

API Integration

Integrating a third-party payment provider

[agent] feat: Integrate Stripe payment processing

Intent: Replace legacy payment system with Stripe for card processing

Plan:
- Add Stripe SDK and configure API keys
- Create payment service abstraction layer
- Implement checkout flow with Payment Intents
- Add webhook handler for payment events
- Update order status based on payment state

Changes:
- src/services/payment.ts: New Stripe payment service
- src/api/webhooks/stripe.ts: Webhook handler for payment events
- src/api/checkout.ts: Updated checkout to use Payment Intents
- src/config/stripe.ts: Stripe configuration and key management
- src/types/payment.d.ts: Payment type definitions
- package.json: Added stripe dependency

Verified: Test mode transactions successful, webhook events processed

Context: The legacy payment provider is being deprecated. Stripe
provides better developer experience and broader payment method support.

Limitations:
- Only card payments implemented; Apple/Google Pay planned for phase 2
- Subscription billing not yet supported
- Refunds must be processed manually via Stripe dashboard

References:
- https://stripe.com/docs/payments/payment-intents
- Internal ticket: PAY-1234

Performance Optimization

Adding caching to reduce database load

[agent] perf: Add Redis caching for user sessions

Intent: Reduce database load by caching frequently accessed user data

Plan:
- Set up Redis connection with connection pooling
- Add cache layer for user session lookups
- Implement cache invalidation on user updates
- Add cache hit/miss metrics

Changes:
- src/cache/redis.ts: Redis client setup with pooling
- src/services/session.ts: Added caching to session lookups
- src/services/user.ts: Cache invalidation on user updates
- src/middleware/metrics.ts: Added cache performance metrics
- docker-compose.yml: Added Redis service for local dev

Verified: Load tests show 70% reduction in DB queries, cache hit rate ~85%

Limitations:
- Cache TTL set to 15 minutes; stale data possible within window
- No cache warming on startup; first requests will be slower

Security Fix

Addressing a SQL injection vulnerability

[agent] fix: Prevent SQL injection in search endpoint

Intent: Address security vulnerability in product search

Plan:
- Replace string concatenation with parameterized queries
- Add input validation for search terms
- Add SQL injection test cases
- Review other endpoints for similar issues

Changes:
- src/api/search.ts: Converted to parameterized queries
- src/utils/validation.ts: Added sanitizeSearchTerm function
- src/api/search.test.ts: Added SQL injection test cases
- src/api/products.ts: Fixed similar issue in product filters

Verified: All SQL injection test cases pass, manual testing confirms fix

Context: Security scan identified SQL injection risk in search endpoint.
The vulnerability allowed arbitrary SQL execution via crafted search terms.

References:
- OWASP SQL Injection Prevention Cheat Sheet
- Internal security ticket: SEC-789

Documentation Update

Updating API documentation for new endpoints

[agent] docs: Update API documentation for v2 endpoints

Intent: Document the new v2 API endpoints added last sprint

Plan:
- Add OpenAPI specs for new endpoints
- Update README with v2 migration guide
- Add code examples for common use cases

Changes:
- docs/api/openapi.yaml: Added v2 endpoint specifications
- docs/README.md: Added v2 migration section
- docs/examples/v2-migration.md: New migration guide with examples

Verified: OpenAPI spec validates, examples tested against dev server

Test Coverage

Adding missing test coverage for edge cases

[agent] test: Add edge case tests for form validation

Intent: Improve test coverage for form validation utilities

Plan:
- Identify untested edge cases from coverage report
- Add tests for empty inputs, special characters, max lengths
- Add tests for international characters and RTL text
- Ensure all validation error messages are tested

Changes:
- src/utils/validation.test.ts: Added 23 new test cases
- src/components/Form.test.tsx: Added edge case tests for form submission
- jest.config.js: Updated coverage thresholds

Verified: Coverage increased from 67% to 94% for validation module

Context: Code coverage audit identified validation as undertested area.
These tests cover edge cases that caused production issues previously.

Key Patterns

  • Intent clarity: Each example starts with a clear statement of what was requested, not just what was done.
  • Plan traceability: The plan steps map directly to the changes made, allowing reviewers to verify completeness.
  • Honest verification: The verified field accurately reflects what testing was actually performed.
  • Limitations acknowledged: Complex changes include known limitations and edge cases not handled.
  • Context when needed: Background information is provided when it helps understand the "why" behind decisions.