Remove anyio.create_task_group() from receive_messages() to fix the
RuntimeError "Attempted to exit cancel scope in a different task than
it was entered in" when using the SDK with FastAPI's SSE streaming.
The issue occurred because FastAPI can move async generators between
different asyncio tasks during the streaming lifecycle, which conflicts
with anyio's cancel scope tracking.
Changes:
- Remove task group usage from receive_messages()
- Read stderr sequentially after stdout completes
- Add test to ensure no task groups are used
- Fix existing test expectation for buffer overflow
This is a minimal fix that maintains compatibility while solving the
core issue. The trade-off is that stderr is read after stdout instead
of concurrently, but this is unlikely to cause issues in practice.
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Co-Authored-By: Claude <noreply@anthropic.com>
Removed redundant comments that simply restate what the code is doing.
Kept only comments that provide valuable context or explain complex behavior.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
The CLIJSONDecodeError constructor expects an Exception as the second
argument, not None. Changed to pass a ValueError with details about
the buffer size limit being exceeded.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
Adds buffering to accumulate incomplete JSON messages that are split
across multiple stream reads due to asyncio's 64KB default buffer limit.
- Implement 1MB buffer to accumulate partial JSON
- Clear buffer on successful parse or size limit exceeded
- Add comprehensive tests for split JSON scenarios
Fixes CLIJSONDecodeError when reading large minified JSON files.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
The CLI only sends total_cost_usd, not cost_usd. This PR:
- Removes the non-existent cost_usd field from ResultMessage
- Makes total_cost_usd optional since it may be missing
- Handles GeneratorExit gracefully in subprocess transport
- Removes unnecessary cancel scope call
Fixes the error users were experiencing:
- KeyError: 'cost_usd'
- Field required [type=missing, input_value=...]
The anyio cancel scope error still appears in logs but doesn't affect functionality.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
