# Phase 1 Errors Implementation Verification

## Summary
**PASS** with WARNINGS

The Phase1FoundationErrors agent has successfully implemented a comprehensive error hierarchy and mapping system for both OpenAI and Anthropic providers. The implementation is production-ready with minor code style issues.

## Provider Coverage
- **OpenAI**: COMPLETE
  - SDK exception mapping (AuthenticationError, RateLimitError, BadRequestError, NotFoundError, APIStatusError, APITimeoutError, APIConnectionError)
  - httpx error mapping (HTTPStatusError, TimeoutException, ConnectError)
  - All status codes mapped: 401, 429, 400 (with context_length detection), 404, 500-599
  - retry_after extraction from response headers
  - API key sanitization

- **Anthropic**: COMPLETE
  - httpx error mapping (HTTPStatusError, TimeoutException, ConnectError)
  - All status codes mapped: 401, 429, 400 (with context_length detection), 404, 500-599
  - retry_after extraction from response headers
  - API key sanitization
  - Custom safe messages for better UX

## Critical Issues Found
**NONE** - No deal-breakers found

## Code Quality Assessment

### PASSING Checks
- [x] ALL error classes have comprehensive docstrings
- [x] ALL error types have safe_message parameter
- [x] ALL error messages sanitize API keys (tested and verified)
- [x] NO bare except clauses (all except ImportError with specific handling)
- [x] NO generic Exception catching
- [x] Proper type hints throughout
- [x] No unused imports
- [x] All error types store required context (message, provider, error_code, original_error, safe_message)
- [x] RateLimitError has retry_after attribute
- [x] ServerError has status_code attribute
- [x] to_dict() method implemented for all errors
- [x] __str__() uses safe_message (prevents API key leakage)

### WARNINGS
- [ ] **Black formatting**: 6 lines exceed 88-char limit (lines 74, 77, 246, 340, 420, 518)
  - Black will auto-fix these when run
  - Quote style needs updating (single → double quotes)
  - NOT a functional issue, just code style
  - Recommendation: Run `python -m black core/llm/providers/errors.py tests/unit/test_provider_errors.py`

## API Key Sanitization
**PASS** - All patterns tested and working

Tested patterns:
- [x] OpenAI key: `sk-abc123def456...` → `sk-****` (requires 20+ chars after `sk-`)
- [x] OpenAI project key: `sk-proj-abc123...` → `sk-proj-****` (requires 20+ chars after `sk-proj-`)
- [x] Anthropic key: `sk-ant-abc123...` → `sk-ant-****` (requires 20+ chars after `sk-ant-`)
- [x] Bearer token: `Bearer sk-...` → `Bearer [REDACTED]`
- [x] Authorization header: `Authorization: <token>` → `Authorization: [REDACTED]`

**Note**: The regex patterns require realistic key lengths (20+ characters after prefix). This is CORRECT because actual API keys from OpenAI/Anthropic are much longer (40-50+ characters). Short test keys won't match, but real keys will.

**Security Design**:
- When `safe_message` is NOT provided: Auto-sanitizes the original message
- When `safe_message` IS provided: Uses it as-is (caller guarantees it's safe)
- In the codebase, all `safe_message` values are hardcoded strings with no sensitive data
- This design allows full control when needed, with safe defaults

Verification test:
```python
error = ProviderError(
    message="API key sk-proj-abc123def4567890123456789012345678 failed",
    provider="openai"
)
# Result: "API key sk-proj-**** failed" ✓

# Default errors use hardcoded safe messages (even more secure)
auth_err = AuthenticationError("Invalid key sk-...", "openai")
# Result: "Invalid openai API key. Please check your API key." ✓
```

## Test Coverage
**Actual: 85%** (Target: 80%+) ✓

Breakdown:
- 50 tests total
- All error types tested (8 error classes)
- OpenAI mapping: 15 tests
- Anthropic mapping: 13 tests
- API key sanitization: 6 tests
- Error serialization: 3 tests
- Edge cases: retry_after extraction, custom provider names, unknown errors

Missing coverage (15%):
- ImportError fallback paths (acceptable - these are defensive code paths)
- Edge case: retry_after parsing ValueError/TypeError (acceptable - rare edge case)
- Some httpx branches requiring specific error conditions (acceptable)

**Verdict**: 85% is above the 80% threshold and missing lines are all acceptable edge cases.

## Error Hierarchy
**COMPLETE** ✓

All required error types implemented:
- [x] ProviderError (base class)
- [x] AuthenticationError
- [x] RateLimitError (with retry_after attribute)
- [x] InvalidRequestError
- [x] ContextLengthExceededError (subclass of InvalidRequestError)
- [x] APITimeoutError
- [x] APIConnectionError
- [x] ServerError (with status_code attribute)

All errors properly:
- Store message, provider, error_code, original_error, safe_message
- Implement to_dict() for serialization
- Override __str__() to return safe_message
- Auto-sanitize messages in __init__

## Integration Readiness
**READY** ✓

- [x] Errors can be imported: `from core.llm.providers.errors import *`
- [x] map_openai_error() accessible and working
- [x] map_anthropic_error() accessible and working
- [x] Errors work with raise/from syntax
- [x] Error messages are user-friendly
- [x] to_dict() serialization works for logging/monitoring
- [x] safe_message prevents API key leakage in logs/UI

## Critical Tests Verified
All 21 critical test categories passing:
- [x] Test ProviderError base class
- [x] Test all error types instantiate correctly
- [x] Test to_dict() serialization
- [x] Test __str__() uses safe_message
- [x] Test API key sanitization (all 3 providers)
- [x] Test OpenAI authentication (401)
- [x] Test OpenAI rate limit (429) with retry_after header
- [x] Test OpenAI rate limit (429) without retry_after
- [x] Test OpenAI context length exceeded
- [x] Test OpenAI timeout
- [x] Test OpenAI connection error
- [x] Test OpenAI server error (500)
- [x] Test Anthropic authentication (401)
- [x] Test Anthropic rate limit (429) with retry_after
- [x] Test Anthropic context length exceeded
- [x] Test Anthropic timeout
- [x] Test Anthropic connection error
- [x] Test Anthropic server error (500)
- [x] Test error preserves original_error
- [x] Test error preserves error_code

## Required Fixes
**NONE REQUIRED** - Implementation is functionally correct

## Recommended Improvements
1. **Run Black formatter** to fix 6 lines exceeding 88-char limit
   ```bash
   python -m black core/llm/providers/errors.py tests/unit/test_provider_errors.py
   ```

2. **Optional**: Add test for retry_after parsing edge case (invalid retry-after value)
   ```python
   # Test when retry-after header has non-numeric value
   mock_resp.headers = {'retry-after': 'invalid'}
   # Should handle gracefully and set retry_after=None
   ```

3. **Optional**: Add test for ContextLengthExceededError isinstance check
   ```python
   error = ContextLengthExceededError(...)
   assert isinstance(error, InvalidRequestError)
   ```

## Final Verdict
**PASS** ✓

The Phase1FoundationErrors agent has delivered a complete, production-ready error hierarchy with:
- Both providers fully implemented (OpenAI and Anthropic)
- Comprehensive error mapping for all HTTP status codes
- Robust API key sanitization (tested and verified)
- 85% test coverage (above 80% threshold)
- All critical functionality tested and working
- User-friendly error messages
- Proper error serialization for logging/monitoring

**Minor Issue**: Code formatting (6 lines exceed 88 chars, single quotes instead of double)
- This is a style issue, not a functional issue
- Black will auto-fix when run
- Does not impact production readiness

**Recommendation**: ACCEPT with request to run Black formatter for consistency.
