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@shinpr shinpr commented Sep 11, 2025

Summary

This PR introduces two key improvements to enhance E2E testing coverage and prevent error masking
in the codebase:

  1. Integration Point Analysis - Systematic mapping of cross-feature integration points during
    design phase
  2. Fail-Fast Principles - Elimination of inappropriate fallback implementations that hide
    errors

Changes Made

  • technical-designer.md: Added integration point mapping requirement for Design Docs
  • typescript-testing.md: Enhanced E2E testing with cross-functional verification requirements
  • ai-development-guide.md: Introduced fail-fast principles and fallback design guidelines
  • typescript.md: Added explicit error handling without unconditional fallbacks
  • rules-index.yaml: Updated with AWS Builders' Library references

Problem Solved

Before

  • E2E tests were isolated within individual features → Integration failures discovered late
  • Excessive fallback implementations → Error suppression hindering debugging
  • No systematic approach to identify cross-feature impacts

After

  • Design-time integration mapping → Cross-functional tests automatically derived
  • Fail-fast error handling → Explicit failure instead of silent degradation
  • Measurable success criteria → 5-second response time, no content changes

Technical Details

  • Total additions: 128 lines across 10 files
  • No breaking changes: Pure additions to existing rule files
  • Responsibility separation: Source references managed in rules-index.yaml, content in rule
    files
  • CI/CD ready: Cross-functional tests designed for automatic pipeline execution

Impact

This change will significantly improve:

  • Early detection of integration issues during development
  • Debugging efficiency through explicit error handling
  • Test coverage of cross-feature interactions
  • Code quality by preventing error masking patterns

shinpr and others added 2 commits September 11, 2025 13:31
…ove E2E testing

- Add integration point mapping to technical-designer.md for identifying cross-feature impacts
- Enhance E2E testing with cross-functional validation requirements in typescript-testing.md
- Introduce fail-fast principles and fallback design guidelines in ai-development-guide.md
- Add explicit error handling without fallback in typescript.md
- Update rules-index.yaml with AWS Builders' Library reference for distributed systems

These changes ensure better detection of integration issues early in development and prevent
error masking through inappropriate fallback implementations.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>
…l-fast principles

- Mirror Japanese changes to English rule files for consistency
- Add integration point mapping to technical-designer.md (EN)
- Enhance E2E testing with cross-functional verification in typescript-testing.md (EN)
- Include fail-fast principles in ai-development-guide.md and typescript.md (EN)
- Update rules-index.yaml (EN) with AWS Builders' Library references

Ensures AI execution precision maximization across both language environments
with clear, concise English expressions optimized for LLM understanding.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>
@shinpr shinpr self-assigned this Sep 11, 2025
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