- @with_retry decorator and retry_async() function - Exponential backoff with jitter - Retries on: timeout, connection errors, HTTP 429/5xx - Web search tool now retries on network failures - Configurable via RETRY_MAX_ATTEMPTS, RETRY_BASE_DELAY, RETRY_MAX_DELAY - 29 new tests (205 total passing) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>