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fix: handle rate_limit_event crash in chat sessions

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The Claude CLI sends `rate_limit_event` messages that the SDK's
`parse_message()` doesn't recognize, raising `MessageParseError` and
crashing all three chat session types (spec, assistant, expand).

Changes:
- Bump claude-agent-sdk minimum from 0.1.0 to 0.1.39
- Add `check_rate_limit_error()` helper in chat_constants.py that
  detects rate limits from both MessageParseError data payloads and
  error message text patterns
- Wrap `receive_response()` loops in all three `_query_claude()` methods
  with retry-on-rate-limit logic (up to 3 retries with backoff)
- Gracefully log and skip non-rate-limit MessageParseError instead of
  crashing the session
- Add `rate_limited` message type to frontend TypeScript types and
  handle it in useSpecChat, useAssistantChat, useExpandChat hooks to
  show "Rate limited. Retrying in Xs..." system messages

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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2026-02-23 12:21:49 +02:00
parent b7aef15c3b
commit dcdd06e02e
11 changed files with 362 additions and 145 deletions
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2
requirements-prod.txt
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@@ -1,6 +1,6 @@
# Production runtime dependencies only
# For development, use requirements.txt (includes ruff, mypy, pytest)
claude-agent-sdk>=0.1.0,<0.2.0
claude-agent-sdk>=0.1.39,<0.2.0
python-dotenv>=1.0.0
sqlalchemy>=2.0.0
fastapi>=0.115.0