pydantic_ai.result

StreamedRunResult dataclass

Bases: Generic[AgentDepsT, OutputDataT]

Result of a streamed run that returns structured data via a tool call.

Source code in pydantic_ai_slim/pydantic_ai/result.py

@dataclass(init=False)
class StreamedRunResult(Generic[AgentDepsT, OutputDataT]):
    """Result of a streamed run that returns structured data via a tool call."""

    _all_messages: list[_messages.ModelMessage]
    _new_message_index: int

    _stream_response: AgentStream[AgentDepsT, OutputDataT] | None = None
    _on_complete: Callable[[], Awaitable[None]] | None = None

    _run_result: AgentRunResult[OutputDataT] | None = None

    is_complete: bool = field(default=False, init=False)
    """Whether the stream has all been received.

    This is set to `True` when one of
    [`stream_output`][pydantic_ai.result.StreamedRunResult.stream_output],
    [`stream_text`][pydantic_ai.result.StreamedRunResult.stream_text],
    [`stream_responses`][pydantic_ai.result.StreamedRunResult.stream_responses] or
    [`get_output`][pydantic_ai.result.StreamedRunResult.get_output] completes.
    """

    @overload
    def __init__(
        self,
        all_messages: list[_messages.ModelMessage],
        new_message_index: int,
        stream_response: AgentStream[AgentDepsT, OutputDataT] | None,
        on_complete: Callable[[], Awaitable[None]] | None,
    ) -> None: ...

    @overload
    def __init__(
        self,
        all_messages: list[_messages.ModelMessage],
        new_message_index: int,
        *,
        run_result: AgentRunResult[OutputDataT],
    ) -> None: ...

    def __init__(
        self,
        all_messages: list[_messages.ModelMessage],
        new_message_index: int,
        stream_response: AgentStream[AgentDepsT, OutputDataT] | None = None,
        on_complete: Callable[[], Awaitable[None]] | None = None,
        run_result: AgentRunResult[OutputDataT] | None = None,
    ) -> None:
        self._all_messages = all_messages
        self._new_message_index = new_message_index

        self._stream_response = stream_response
        self._on_complete = on_complete
        self._run_result = run_result

    def all_messages(self, *, output_tool_return_content: str | None = None) -> list[_messages.ModelMessage]:
        """Return the history of _messages.

        Args:
            output_tool_return_content: The return content of the tool call to set in the last message.
                This provides a convenient way to modify the content of the output tool call if you want to continue
                the conversation and want to set the response to the output tool call. If `None`, the last message will
                not be modified.

        Returns:
            List of messages.
        """
        # this is a method to be consistent with the other methods
        if output_tool_return_content is not None:
            raise NotImplementedError('Setting output tool return content is not supported for this result type.')
        return self._all_messages

    def all_messages_json(self, *, output_tool_return_content: str | None = None) -> bytes:  # pragma: no cover
        """Return all messages from [`all_messages`][pydantic_ai.result.StreamedRunResult.all_messages] as JSON bytes.

        Args:
            output_tool_return_content: The return content of the tool call to set in the last message.
                This provides a convenient way to modify the content of the output tool call if you want to continue
                the conversation and want to set the response to the output tool call. If `None`, the last message will
                not be modified.

        Returns:
            JSON bytes representing the messages.
        """
        return _messages.ModelMessagesTypeAdapter.dump_json(
            self.all_messages(output_tool_return_content=output_tool_return_content)
        )

    def new_messages(
        self, *, output_tool_return_content: str | None = None
    ) -> list[_messages.ModelMessage]:  # pragma: no cover
        """Return new messages associated with this run.

        Messages from older runs are excluded.

        Args:
            output_tool_return_content: The return content of the tool call to set in the last message.
                This provides a convenient way to modify the content of the output tool call if you want to continue
                the conversation and want to set the response to the output tool call. If `None`, the last message will
                not be modified.

        Returns:
            List of new messages.
        """
        return self.all_messages(output_tool_return_content=output_tool_return_content)[self._new_message_index :]

    def new_messages_json(self, *, output_tool_return_content: str | None = None) -> bytes:  # pragma: no cover
        """Return new messages from [`new_messages`][pydantic_ai.result.StreamedRunResult.new_messages] as JSON bytes.

        Args:
            output_tool_return_content: The return content of the tool call to set in the last message.
                This provides a convenient way to modify the content of the output tool call if you want to continue
                the conversation and want to set the response to the output tool call. If `None`, the last message will
                not be modified.

        Returns:
            JSON bytes representing the new messages.
        """
        return _messages.ModelMessagesTypeAdapter.dump_json(
            self.new_messages(output_tool_return_content=output_tool_return_content)
        )

    @deprecated('`StreamedRunResult.stream` is deprecated, use `stream_output` instead.')
    async def stream(self, *, debounce_by: float | None = 0.1) -> AsyncIterator[OutputDataT]:
        async for output in self.stream_output(debounce_by=debounce_by):
            yield output

    async def stream_output(self, *, debounce_by: float | None = 0.1) -> AsyncIterator[OutputDataT]:
        """Stream the output as an async iterable.

        The pydantic validator for structured data will be called in
        [partial mode](https://docs.pydantic.dev/dev/concepts/experimental/#partial-validation)
        on each iteration.

        Args:
            debounce_by: by how much (if at all) to debounce/group the output chunks by. `None` means no debouncing.
                Debouncing is particularly important for long structured outputs to reduce the overhead of
                performing validation as each token is received.

        Returns:
            An async iterable of the response data.
        """
        if self._run_result is not None:
            yield self._run_result.output
            await self._marked_completed()
        elif self._stream_response is not None:
            async for output in self._stream_response.stream_output(debounce_by=debounce_by):
                yield output
            await self._marked_completed(self._stream_response.get())
        else:
            raise ValueError('No stream response or run result provided')  # pragma: no cover

    async def stream_text(self, *, delta: bool = False, debounce_by: float | None = 0.1) -> AsyncIterator[str]:
        """Stream the text result as an async iterable.

        !!! note
            Result validators will NOT be called on the text result if `delta=True`.

        Args:
            delta: if `True`, yield each chunk of text as it is received, if `False` (default), yield the full text
                up to the current point.
            debounce_by: by how much (if at all) to debounce/group the response chunks by. `None` means no debouncing.
                Debouncing is particularly important for long structured responses to reduce the overhead of
                performing validation as each token is received.
        """
        if self._run_result is not None:  # pragma: no cover
            # We can't really get here, as `_run_result` is only set in `run_stream` when `CallToolsNode` produces `DeferredToolRequests` output
            # as a result of a tool function raising `CallDeferred` or `ApprovalRequired`.
            # That'll change if we ever support something like `raise EndRun(output: OutputT)` where `OutputT` could be `str`.
            if not isinstance(self._run_result.output, str):
                raise exceptions.UserError('stream_text() can only be used with text responses')
            yield self._run_result.output
            await self._marked_completed()
        elif self._stream_response is not None:
            async for text in self._stream_response.stream_text(delta=delta, debounce_by=debounce_by):
                yield text
            await self._marked_completed(self._stream_response.get())
        else:
            raise ValueError('No stream response or run result provided')  # pragma: no cover

    @deprecated('`StreamedRunResult.stream_structured` is deprecated, use `stream_responses` instead.')
    async def stream_structured(
        self, *, debounce_by: float | None = 0.1
    ) -> AsyncIterator[tuple[_messages.ModelResponse, bool]]:
        async for msg, last in self.stream_responses(debounce_by=debounce_by):
            yield msg, last

    async def stream_responses(
        self, *, debounce_by: float | None = 0.1
    ) -> AsyncIterator[tuple[_messages.ModelResponse, bool]]:
        """Stream the response as an async iterable of Structured LLM Messages.

        Args:
            debounce_by: by how much (if at all) to debounce/group the response chunks by. `None` means no debouncing.
                Debouncing is particularly important for long structured responses to reduce the overhead of
                performing validation as each token is received.

        Returns:
            An async iterable of the structured response message and whether that is the last message.
        """
        if self._run_result is not None:
            model_response = cast(_messages.ModelResponse, self.all_messages()[-1])
            yield model_response, True
            await self._marked_completed()
        elif self._stream_response is not None:
            # if the message currently has any parts with content, yield before streaming
            async for msg in self._stream_response.stream_responses(debounce_by=debounce_by):
                yield msg, False

            msg = self._stream_response.get()
            yield msg, True

            await self._marked_completed(msg)
        else:
            raise ValueError('No stream response or run result provided')  # pragma: no cover

    async def get_output(self) -> OutputDataT:
        """Stream the whole response, validate and return it."""
        if self._run_result is not None:
            output = self._run_result.output
            await self._marked_completed()
            return output
        elif self._stream_response is not None:
            output = await self._stream_response.get_output()
            await self._marked_completed(self._stream_response.get())
            return output
        else:
            raise ValueError('No stream response or run result provided')  # pragma: no cover

    def usage(self) -> RunUsage:
        """Return the usage of the whole run.

        !!! note
            This won't return the full usage until the stream is finished.
        """
        if self._run_result is not None:
            return self._run_result.usage()
        elif self._stream_response is not None:
            return self._stream_response.usage()
        else:
            raise ValueError('No stream response or run result provided')  # pragma: no cover

    def timestamp(self) -> datetime:
        """Get the timestamp of the response."""
        if self._run_result is not None:
            return self._run_result.timestamp()
        elif self._stream_response is not None:
            return self._stream_response.timestamp()
        else:
            raise ValueError('No stream response or run result provided')  # pragma: no cover

    @deprecated('`validate_structured_output` is deprecated, use `validate_response_output` instead.')
    async def validate_structured_output(
        self, message: _messages.ModelResponse, *, allow_partial: bool = False
    ) -> OutputDataT:
        return await self.validate_response_output(message, allow_partial=allow_partial)

    async def validate_response_output(
        self, message: _messages.ModelResponse, *, allow_partial: bool = False
    ) -> OutputDataT:
        """Validate a structured result message."""
        if self._run_result is not None:
            return self._run_result.output
        elif self._stream_response is not None:
            return await self._stream_response.validate_response_output(message, allow_partial=allow_partial)
        else:
            raise ValueError('No stream response or run result provided')  # pragma: no cover

    async def _marked_completed(self, message: _messages.ModelResponse | None = None) -> None:
        self.is_complete = True
        if message is not None:
            self._all_messages.append(message)
        if self._on_complete is not None:
            await self._on_complete()

is_complete class-attribute instance-attribute

is_complete: bool = field(default=False, init=False)

Whether the stream has all been received.

This is set to True when one of stream_output, stream_text, stream_responses or get_output completes.

all_messages

all_messages(
    *, output_tool_return_content: str | None = None
) -> list[ModelMessage]

Return the history of _messages.

Parameters:

Name	Type	Description	Default
output_tool_return_content	str | None	The return content of the tool call to set in the last message. This provides a convenient way to modify the content of the output tool call if you want to continue the conversation and want to set the response to the output tool call. If None, the last message will not be modified.	None

Returns:

Type	Description
list[ModelMessage]	List of messages.

Source code in pydantic_ai_slim/pydantic_ai/result.py

def all_messages(self, *, output_tool_return_content: str | None = None) -> list[_messages.ModelMessage]:
    """Return the history of _messages.

    Args:
        output_tool_return_content: The return content of the tool call to set in the last message.
            This provides a convenient way to modify the content of the output tool call if you want to continue
            the conversation and want to set the response to the output tool call. If `None`, the last message will
            not be modified.

    Returns:
        List of messages.
    """
    # this is a method to be consistent with the other methods
    if output_tool_return_content is not None:
        raise NotImplementedError('Setting output tool return content is not supported for this result type.')
    return self._all_messages

all_messages_json

all_messages_json(
    *, output_tool_return_content: str | None = None
) -> bytes

Return all messages from all_messages as JSON bytes.

Parameters:

Name	Type	Description	Default
output_tool_return_content	str | None	The return content of the tool call to set in the last message. This provides a convenient way to modify the content of the output tool call if you want to continue the conversation and want to set the response to the output tool call. If None, the last message will not be modified.	None

Returns:

Type	Description
bytes	JSON bytes representing the messages.

Source code in pydantic_ai_slim/pydantic_ai/result.py

def all_messages_json(self, *, output_tool_return_content: str | None = None) -> bytes:  # pragma: no cover
    """Return all messages from [`all_messages`][pydantic_ai.result.StreamedRunResult.all_messages] as JSON bytes.

    Args:
        output_tool_return_content: The return content of the tool call to set in the last message.
            This provides a convenient way to modify the content of the output tool call if you want to continue
            the conversation and want to set the response to the output tool call. If `None`, the last message will
            not be modified.

    Returns:
        JSON bytes representing the messages.
    """
    return _messages.ModelMessagesTypeAdapter.dump_json(
        self.all_messages(output_tool_return_content=output_tool_return_content)
    )

new_messages

new_messages(
    *, output_tool_return_content: str | None = None
) -> list[ModelMessage]

Return new messages associated with this run.

Messages from older runs are excluded.

Parameters:

Name	Type	Description	Default
output_tool_return_content	str | None	The return content of the tool call to set in the last message. This provides a convenient way to modify the content of the output tool call if you want to continue the conversation and want to set the response to the output tool call. If None, the last message will not be modified.	None

Returns:

Type	Description
list[ModelMessage]	List of new messages.

Source code in pydantic_ai_slim/pydantic_ai/result.py

def new_messages(
    self, *, output_tool_return_content: str | None = None
) -> list[_messages.ModelMessage]:  # pragma: no cover
    """Return new messages associated with this run.

    Messages from older runs are excluded.

    Args:
        output_tool_return_content: The return content of the tool call to set in the last message.
            This provides a convenient way to modify the content of the output tool call if you want to continue
            the conversation and want to set the response to the output tool call. If `None`, the last message will
            not be modified.

    Returns:
        List of new messages.
    """
    return self.all_messages(output_tool_return_content=output_tool_return_content)[self._new_message_index :]

new_messages_json

new_messages_json(
    *, output_tool_return_content: str | None = None
) -> bytes

Return new messages from new_messages as JSON bytes.

Parameters:

Name	Type	Description	Default
output_tool_return_content	str | None	The return content of the tool call to set in the last message. This provides a convenient way to modify the content of the output tool call if you want to continue the conversation and want to set the response to the output tool call. If None, the last message will not be modified.	None

Returns:

Type	Description
bytes	JSON bytes representing the new messages.

Source code in pydantic_ai_slim/pydantic_ai/result.py

def new_messages_json(self, *, output_tool_return_content: str | None = None) -> bytes:  # pragma: no cover
    """Return new messages from [`new_messages`][pydantic_ai.result.StreamedRunResult.new_messages] as JSON bytes.

    Args:
        output_tool_return_content: The return content of the tool call to set in the last message.
            This provides a convenient way to modify the content of the output tool call if you want to continue
            the conversation and want to set the response to the output tool call. If `None`, the last message will
            not be modified.

    Returns:
        JSON bytes representing the new messages.
    """
    return _messages.ModelMessagesTypeAdapter.dump_json(
        self.new_messages(output_tool_return_content=output_tool_return_content)
    )

stream async deprecated

stream(
    *, debounce_by: float | None = 0.1
) -> AsyncIterator[OutputDataT]

Deprecated

StreamedRunResult.stream is deprecated, use stream_output instead.

Source code in pydantic_ai_slim/pydantic_ai/result.py

@deprecated('`StreamedRunResult.stream` is deprecated, use `stream_output` instead.')
async def stream(self, *, debounce_by: float | None = 0.1) -> AsyncIterator[OutputDataT]:
    async for output in self.stream_output(debounce_by=debounce_by):
        yield output

stream_output async

stream_output(
    *, debounce_by: float | None = 0.1
) -> AsyncIterator[OutputDataT]

Stream the output as an async iterable.

The pydantic validator for structured data will be called in partial mode on each iteration.

Parameters:

Name	Type	Description	Default
debounce_by	float | None	by how much (if at all) to debounce/group the output chunks by. None means no debouncing. Debouncing is particularly important for long structured outputs to reduce the overhead of performing validation as each token is received.	0.1

Returns:

Type	Description
AsyncIterator[OutputDataT]	An async iterable of the response data.

Source code in pydantic_ai_slim/pydantic_ai/result.py

async def stream_output(self, *, debounce_by: float | None = 0.1) -> AsyncIterator[OutputDataT]:
    """Stream the output as an async iterable.

    The pydantic validator for structured data will be called in
    [partial mode](https://docs.pydantic.dev/dev/concepts/experimental/#partial-validation)
    on each iteration.

    Args:
        debounce_by: by how much (if at all) to debounce/group the output chunks by. `None` means no debouncing.
            Debouncing is particularly important for long structured outputs to reduce the overhead of
            performing validation as each token is received.

    Returns:
        An async iterable of the response data.
    """
    if self._run_result is not None:
        yield self._run_result.output
        await self._marked_completed()
    elif self._stream_response is not None:
        async for output in self._stream_response.stream_output(debounce_by=debounce_by):
            yield output
        await self._marked_completed(self._stream_response.get())
    else:
        raise ValueError('No stream response or run result provided')  # pragma: no cover

stream_text async

stream_text(
    *, delta: bool = False, debounce_by: float | None = 0.1
) -> AsyncIterator[str]

Stream the text result as an async iterable.

Note

Result validators will NOT be called on the text result if delta=True.

Parameters:

Name	Type	Description	Default
delta	bool	if True, yield each chunk of text as it is received, if False (default), yield the full text up to the current point.	False
debounce_by	float | None	by how much (if at all) to debounce/group the response chunks by. None means no debouncing. Debouncing is particularly important for long structured responses to reduce the overhead of performing validation as each token is received.	0.1

Source code in pydantic_ai_slim/pydantic_ai/result.py

async def stream_text(self, *, delta: bool = False, debounce_by: float | None = 0.1) -> AsyncIterator[str]:
    """Stream the text result as an async iterable.

    !!! note
        Result validators will NOT be called on the text result if `delta=True`.

    Args:
        delta: if `True`, yield each chunk of text as it is received, if `False` (default), yield the full text
            up to the current point.
        debounce_by: by how much (if at all) to debounce/group the response chunks by. `None` means no debouncing.
            Debouncing is particularly important for long structured responses to reduce the overhead of
            performing validation as each token is received.
    """
    if self._run_result is not None:  # pragma: no cover
        # We can't really get here, as `_run_result` is only set in `run_stream` when `CallToolsNode` produces `DeferredToolRequests` output
        # as a result of a tool function raising `CallDeferred` or `ApprovalRequired`.
        # That'll change if we ever support something like `raise EndRun(output: OutputT)` where `OutputT` could be `str`.
        if not isinstance(self._run_result.output, str):
            raise exceptions.UserError('stream_text() can only be used with text responses')
        yield self._run_result.output
        await self._marked_completed()
    elif self._stream_response is not None:
        async for text in self._stream_response.stream_text(delta=delta, debounce_by=debounce_by):
            yield text
        await self._marked_completed(self._stream_response.get())
    else:
        raise ValueError('No stream response or run result provided')  # pragma: no cover

stream_structured async deprecated

stream_structured(
    *, debounce_by: float | None = 0.1
) -> AsyncIterator[tuple[ModelResponse, bool]]

Deprecated

StreamedRunResult.stream_structured is deprecated, use stream_responses instead.

Source code in pydantic_ai_slim/pydantic_ai/result.py

@deprecated('`StreamedRunResult.stream_structured` is deprecated, use `stream_responses` instead.')
async def stream_structured(
    self, *, debounce_by: float | None = 0.1
) -> AsyncIterator[tuple[_messages.ModelResponse, bool]]:
    async for msg, last in self.stream_responses(debounce_by=debounce_by):
        yield msg, last

stream_responses async

stream_responses(
    *, debounce_by: float | None = 0.1
) -> AsyncIterator[tuple[ModelResponse, bool]]

Stream the response as an async iterable of Structured LLM Messages.

Parameters:

Name	Type	Description	Default
debounce_by	float | None	by how much (if at all) to debounce/group the response chunks by. None means no debouncing. Debouncing is particularly important for long structured responses to reduce the overhead of performing validation as each token is received.	0.1

Returns:

Type	Description
AsyncIterator[tuple[ModelResponse, bool]]	An async iterable of the structured response message and whether that is the last message.

Source code in pydantic_ai_slim/pydantic_ai/result.py

async def stream_responses(
    self, *, debounce_by: float | None = 0.1
) -> AsyncIterator[tuple[_messages.ModelResponse, bool]]:
    """Stream the response as an async iterable of Structured LLM Messages.

    Args:
        debounce_by: by how much (if at all) to debounce/group the response chunks by. `None` means no debouncing.
            Debouncing is particularly important for long structured responses to reduce the overhead of
            performing validation as each token is received.

    Returns:
        An async iterable of the structured response message and whether that is the last message.
    """
    if self._run_result is not None:
        model_response = cast(_messages.ModelResponse, self.all_messages()[-1])
        yield model_response, True
        await self._marked_completed()
    elif self._stream_response is not None:
        # if the message currently has any parts with content, yield before streaming
        async for msg in self._stream_response.stream_responses(debounce_by=debounce_by):
            yield msg, False

        msg = self._stream_response.get()
        yield msg, True

        await self._marked_completed(msg)
    else:
        raise ValueError('No stream response or run result provided')  # pragma: no cover

get_output async

get_output() -> OutputDataT

Stream the whole response, validate and return it.

Source code in pydantic_ai_slim/pydantic_ai/result.py

async def get_output(self) -> OutputDataT:
    """Stream the whole response, validate and return it."""
    if self._run_result is not None:
        output = self._run_result.output
        await self._marked_completed()
        return output
    elif self._stream_response is not None:
        output = await self._stream_response.get_output()
        await self._marked_completed(self._stream_response.get())
        return output
    else:
        raise ValueError('No stream response or run result provided')  # pragma: no cover

usage

usage() -> RunUsage

Return the usage of the whole run.

Note

This won't return the full usage until the stream is finished.

Source code in pydantic_ai_slim/pydantic_ai/result.py

def usage(self) -> RunUsage:
    """Return the usage of the whole run.

    !!! note
        This won't return the full usage until the stream is finished.
    """
    if self._run_result is not None:
        return self._run_result.usage()
    elif self._stream_response is not None:
        return self._stream_response.usage()
    else:
        raise ValueError('No stream response or run result provided')  # pragma: no cover

timestamp

timestamp() -> datetime

Get the timestamp of the response.

Source code in pydantic_ai_slim/pydantic_ai/result.py

def timestamp(self) -> datetime:
    """Get the timestamp of the response."""
    if self._run_result is not None:
        return self._run_result.timestamp()
    elif self._stream_response is not None:
        return self._stream_response.timestamp()
    else:
        raise ValueError('No stream response or run result provided')  # pragma: no cover

validate_structured_output async deprecated

validate_structured_output(
    message: ModelResponse, *, allow_partial: bool = False
) -> OutputDataT

Deprecated

validate_structured_output is deprecated, use validate_response_output instead.

Source code in pydantic_ai_slim/pydantic_ai/result.py

@deprecated('`validate_structured_output` is deprecated, use `validate_response_output` instead.')
async def validate_structured_output(
    self, message: _messages.ModelResponse, *, allow_partial: bool = False
) -> OutputDataT:
    return await self.validate_response_output(message, allow_partial=allow_partial)

validate_response_output async

validate_response_output(
    message: ModelResponse, *, allow_partial: bool = False
) -> OutputDataT

Validate a structured result message.

Source code in pydantic_ai_slim/pydantic_ai/result.py

async def validate_response_output(
    self, message: _messages.ModelResponse, *, allow_partial: bool = False
) -> OutputDataT:
    """Validate a structured result message."""
    if self._run_result is not None:
        return self._run_result.output
    elif self._stream_response is not None:
        return await self._stream_response.validate_response_output(message, allow_partial=allow_partial)
    else:
        raise ValueError('No stream response or run result provided')  # pragma: no cover