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The Claude Code CLI v2.1.45+ emits a `rate_limit_event` message type that the Python SDK v0.1.19 cannot parse, raising MessageParseError. Two bugs resulted: 1. **False-positive rate limit**: check_rate_limit_error() matched "rate_limit" in the exception string "Unknown message type: rate_limit_event" via both an explicit type check and a regex fallback, triggering 15-19s backoff + query re-send on every session. 2. **One-message-behind**: The MessageParseError killed the receive_response() async generator, but the CLI subprocess was still alive with buffered response data. Catching and returning meant the response was never consumed. The next send_message() would read the previous response first, creating a one-behind offset. Changes: - chat_constants.py: check_rate_limit_error() now returns (False, None) for any MessageParseError, blocking both false-positive paths. Added safe_receive_response() helper that retries receive_response() on MessageParseError — the SDK's decoupled producer/consumer architecture (anyio memory channel) allows the new generator to continue reading remaining messages without data loss. Removed calculate_rate_limit_backoff re-export and MAX_CHAT_RATE_LIMIT_RETRIES constant. - spec_chat_session.py, assistant_chat_session.py, expand_chat_session.py: Replaced retry-with-backoff loops with safe_receive_response() wrapper. Removed asyncio.sleep backoff, query re-send, and rate_limited yield. Cleaned up unused imports (asyncio, calculate_rate_limit_backoff, MAX_CHAT_RATE_LIMIT_RETRIES). - agent.py: Added inner retry loop around receive_response() with same MessageParseError skip-and-restart pattern. Removed early-return that truncated responses. - types.ts: Removed SpecChatRateLimitedMessage, AssistantChatRateLimitedMessage, and their union entries. - useSpecChat.ts, useAssistantChat.ts, useExpandChat.ts: Removed dead 'rate_limited' case handlers. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>