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fix(a2a): Preserve thought metadata in bidirectional part conversions #4241

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fix(a2a): Preserve thought metadata in bidirectional part conversions #4241

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c4ceb4d
fix metadata in genai parts
filipecaixeta Jan 22, 2026
7e41a94
fix a2a genai part convert
filipecaixeta Jan 22, 2026
b00d26c
fix part converter
filipecaixeta Jan 23, 2026
4296f05
Merge branch 'main' into fix-genai-parts
filipecaixeta Jan 23, 2026
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106 changes: 67 additions & 39 deletions src/google/adk/a2a/converters/part_converter.py
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Original file line number Diff line number Diff line change
Expand Up @@ -60,23 +60,30 @@ def convert_a2a_part_to_genai_part(
) -> Optional[genai_types.Part]:
"""Convert an A2A Part to a Google GenAI Part."""
part = a2a_part.root

thought = None
if part.metadata:
thought = part.metadata.get(_get_adk_metadata_key('thought'))

if isinstance(part, a2a_types.TextPart):
return genai_types.Part(text=part.text)
return genai_types.Part(text=part.text, thought=thought)

if isinstance(part, a2a_types.FilePart):
if isinstance(part.file, a2a_types.FileWithUri):
return genai_types.Part(
file_data=genai_types.FileData(
file_uri=part.file.uri, mime_type=part.file.mime_type
)
),
thought=thought,
)

elif isinstance(part.file, a2a_types.FileWithBytes):
return genai_types.Part(
inline_data=genai_types.Blob(
data=base64.b64decode(part.file.bytes),
mime_type=part.file.mime_type,
)
),
thought=thought,
)
else:
logger.warning(
Expand Down Expand Up @@ -104,7 +111,8 @@ def convert_a2a_part_to_genai_part(
return genai_types.Part(
function_call=genai_types.FunctionCall.model_validate(
part.data, by_alias=True
)
),
thought=thought,
)
if (
part.metadata[_get_adk_metadata_key(A2A_DATA_PART_METADATA_TYPE_KEY)]
Expand All @@ -113,7 +121,8 @@ def convert_a2a_part_to_genai_part(
return genai_types.Part(
function_response=genai_types.FunctionResponse.model_validate(
part.data, by_alias=True
)
),
thought=thought,
)
if (
part.metadata[_get_adk_metadata_key(A2A_DATA_PART_METADATA_TYPE_KEY)]
Expand All @@ -122,7 +131,8 @@ def convert_a2a_part_to_genai_part(
return genai_types.Part(
code_execution_result=genai_types.CodeExecutionResult.model_validate(
part.data, by_alias=True
)
),
thought=thought,
)
if (
part.metadata[_get_adk_metadata_key(A2A_DATA_PART_METADATA_TYPE_KEY)]
Expand All @@ -131,7 +141,8 @@ def convert_a2a_part_to_genai_part(
return genai_types.Part(
executable_code=genai_types.ExecutableCode.model_validate(
part.data, by_alias=True
)
),
thought=thought,
)
return genai_types.Part(
inline_data=genai_types.Blob(
Expand All @@ -141,7 +152,8 @@ def convert_a2a_part_to_genai_part(
)
+ A2A_DATA_PART_END_TAG,
mime_type=A2A_DATA_PART_TEXT_MIME_TYPE,
)
),
thought=thought,
)

logger.warning(
Expand All @@ -165,14 +177,15 @@ def convert_genai_part_to_a2a_part(
return a2a_types.Part(root=a2a_part)

if part.file_data:
return a2a_types.Part(
root=a2a_types.FilePart(
file=a2a_types.FileWithUri(
uri=part.file_data.file_uri,
mime_type=part.file_data.mime_type,
)
a2a_part = a2a_types.FilePart(
file=a2a_types.FileWithUri(
uri=part.file_data.file_uri,
mime_type=part.file_data.mime_type,
)
)
if part.thought is not None:
a2a_part.metadata = {_get_adk_metadata_key('thought'): part.thought}
return a2a_types.Part(root=a2a_part)

if part.inline_data:
if (
Expand All @@ -196,12 +209,15 @@ def convert_genai_part_to_a2a_part(
)
)

metadata = {}
if part.video_metadata:
a2a_part.metadata = {
_get_adk_metadata_key(
'video_metadata'
): part.video_metadata.model_dump(by_alias=True, exclude_none=True)
}
metadata[_get_adk_metadata_key('video_metadata')] = (
part.video_metadata.model_dump(by_alias=True, exclude_none=True)
)
if part.thought is not None:
metadata[_get_adk_metadata_key('thought')] = part.thought
if metadata:
a2a_part.metadata = metadata

return a2a_types.Part(root=a2a_part)

Expand All @@ -211,58 +227,70 @@ def convert_genai_part_to_a2a_part(
# TODO once A2A defined how to service such information, migrate below
# logic accordingly
if part.function_call:
metadata = {
_get_adk_metadata_key(
A2A_DATA_PART_METADATA_TYPE_KEY
): A2A_DATA_PART_METADATA_TYPE_FUNCTION_CALL
}
if part.thought is not None:
metadata[_get_adk_metadata_key('thought')] = part.thought
return a2a_types.Part(
root=a2a_types.DataPart(
data=part.function_call.model_dump(
by_alias=True, exclude_none=True
),
metadata={
_get_adk_metadata_key(
A2A_DATA_PART_METADATA_TYPE_KEY
): A2A_DATA_PART_METADATA_TYPE_FUNCTION_CALL
},
metadata=metadata,
)
)

if part.function_response:
metadata = {
_get_adk_metadata_key(
A2A_DATA_PART_METADATA_TYPE_KEY
): A2A_DATA_PART_METADATA_TYPE_FUNCTION_RESPONSE
}
if part.thought is not None:
metadata[_get_adk_metadata_key('thought')] = part.thought
return a2a_types.Part(
root=a2a_types.DataPart(
data=part.function_response.model_dump(
by_alias=True, exclude_none=True
),
metadata={
_get_adk_metadata_key(
A2A_DATA_PART_METADATA_TYPE_KEY
): A2A_DATA_PART_METADATA_TYPE_FUNCTION_RESPONSE
},
metadata=metadata,
)
)

if part.code_execution_result:
metadata = {
_get_adk_metadata_key(
A2A_DATA_PART_METADATA_TYPE_KEY
): A2A_DATA_PART_METADATA_TYPE_CODE_EXECUTION_RESULT
}
if part.thought is not None:
metadata[_get_adk_metadata_key('thought')] = part.thought
return a2a_types.Part(
root=a2a_types.DataPart(
data=part.code_execution_result.model_dump(
by_alias=True, exclude_none=True
),
metadata={
_get_adk_metadata_key(
A2A_DATA_PART_METADATA_TYPE_KEY
): A2A_DATA_PART_METADATA_TYPE_CODE_EXECUTION_RESULT
},
metadata=metadata,
)
)

if part.executable_code:
metadata = {
_get_adk_metadata_key(
A2A_DATA_PART_METADATA_TYPE_KEY
): A2A_DATA_PART_METADATA_TYPE_EXECUTABLE_CODE
}
if part.thought is not None:
metadata[_get_adk_metadata_key('thought')] = part.thought
return a2a_types.Part(
root=a2a_types.DataPart(
data=part.executable_code.model_dump(
by_alias=True, exclude_none=True
),
metadata={
_get_adk_metadata_key(
A2A_DATA_PART_METADATA_TYPE_KEY
): A2A_DATA_PART_METADATA_TYPE_EXECUTABLE_CODE
},
metadata=metadata,
)
)

Expand Down
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