Only decode JSON input buffer in Anthropic Claude streaming #3875
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xrmx reviewed Oct 17, 2025
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I think the proper fix should look like something like #3874 (comment)
_decode_tool_use was only used when _tool_json_input_buf was found, but we were decoding the entire _content_block after adding _tool_json_input_buf to it. The _content_block overall which could contain non-JSON elements (e.g. {}), causing failures. To fix this, we have removed _decode_tool_use helper function and inlined JSON decoding logic directly into content_block_stop handler in _process_anthropic_claude_chunk, where we only use it to decode _tool_json_input_buf before appending to _content_block. 
Applied proposed fix and tested - seems to work! |
thpierce changed the title thpierce added a commit to aws-observability/aws-otel-python-instrumentation that referenced this pull request Oct 17, 2025
_decode_tool_use was only used when _tool_json_input_buf was found, but we were decoding the entire _content_block after adding _tool_json_input_buf to it. The _content_block overall which could contain non-JSON elements (e.g. {}), causing failures. To fix this, we have removed _decode_tool_use helper function and inlined JSON decoding logic directly into content_block_stop handler in _process_anthropic_claude_chunk, where we only use it to decode _tool_json_input_buf before appending to _content_block. Patch based on open-telemetry/opentelemetry-python-contrib#3875 with code copied directly from https://github.com/open-telemetry/opentelemetry-python-contrib/blob/v0.54b1/instrumentation/opentelemetry-instrumentation-botocore/src/opentelemetry/instrumentation/botocore/extensions/bedrock_utils.py#L289 thpierce added a commit to aws-observability/aws-otel-python-instrumentation that referenced this pull request Oct 17, 2025
_decode_tool_use was only used when _tool_json_input_buf was found, but we were decoding the entire _content_block after adding _tool_json_input_buf to it. The _content_block overall which could contain non-JSON elements (e.g. {}), causing failures. To fix this, we have removed _decode_tool_use helper function and inlined JSON decoding logic directly into content_block_stop handler in _process_anthropic_claude_chunk, where we only use it to decode _tool_json_input_buf before appending to _content_block. Patch based on open-telemetry/opentelemetry-python-contrib#3875 with code copied directly from https://github.com/open-telemetry/opentelemetry-python-contrib/blob/v0.54b1/instrumentation/opentelemetry-instrumentation-botocore/src/opentelemetry/instrumentation/botocore/extensions/bedrock_utils.py#L289 Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
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Description
_decode_tool_use was only used when _tool_json_input_buf was found, but we were decoding the entire _content_block after adding _tool_json_input_buf to it. The _content_block overall which could contain non-JSON elements (e.g. {}), causing failures. To fix this, we have removed _decode_tool_use helper function and inlined JSON decoding logic directly into content_block_stop handler in _process_anthropic_claude_chunk, where we only use it to decode _tool_json_input_buf before appending to _content_block.
Fixes #3874
Type of change
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How Has This Been Tested?
Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration
TypeError: the JSON object must be str, bytes or bytearray, not dictpip install -e opentelemetry-python-contrib/instrumentation/opentelemetry-instrumentation-botocoreand the issue disappeared/expected behaviour was achieved.Does This PR Require a Core Repo Change?
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