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messages v1: some nits, and use create_text_block()

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Mason Daugherty 2025-07-31 17:07:42 -04:00
parent 45533fc875
commit 2cb48b685f
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1 changed files with 24 additions and 21 deletions
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45
libs/core/langchain_core/messages/v1.py
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@ -20,6 +20,7 @@ from langchain_core.messages.ai import (
add_usage,
)
from langchain_core.messages.base import merge_content
from langchain_core.messages.content_blocks import create_text_block
from langchain_core.messages.tool import ToolCallChunk
from langchain_core.messages.tool import invalid_tool_call as create_invalid_tool_call
from langchain_core.messages.tool import tool_call as create_tool_call
@ -49,13 +50,13 @@ class ResponseMetadata(TypedDict, total=False):
Contains additional information returned by the provider, such as
response headers, service tiers, log probabilities, system fingerprints, etc.
Extra keys are permitted from what is typed here (via `total=False`), allowing
Extra keys are permitted from what is typed here (via ``total=False``), allowing
for provider-specific metadata to be included without breaking the type
definition.
"""
model_provider: str
"""Name and version of the provider that created the message (e.g., openai)."""
"""Name and version of the provider that created the message (ex: ``'openai'``)."""
model_name: str
"""Name of the model that generated the message."""
@ -69,8 +70,8 @@ class AIMessage:
and metadata about the generation process.
Attributes:
type: Message type identifier, always ``'ai'``.
id: Unique identifier for the message.
type: Message type identifier, always "ai".
name: Optional human-readable name for the message.
lc_version: Encoding version for the message.
content: List of content blocks containing the message data.
@ -151,7 +152,7 @@ class AIMessage:
parsed: Optional auto-parsed message contents, if applicable.
"""
if isinstance(content, str):
self.content = [{"type": "text", "text": content}]
self.content = [create_text_block(content)]
else:
self.content = content
@ -170,21 +171,21 @@ class AIMessage:
content_tool_calls = {
block["id"]
for block in self.content
if block["type"] == "tool_call" and "id" in block
if block.get("type") == "tool_call" and "id" in block
}
for tool_call in tool_calls:
if "id" in tool_call and tool_call["id"] in content_tool_calls:
continue
self.content.append(tool_call)
self._tool_calls = [
block for block in self.content if block["type"] == "tool_call"
block for block in self.content if block.get("type") == "tool_call"
]
self.invalid_tool_calls = invalid_tool_calls or []
@property
def text(self) -> Optional[str]:
"""Extract all text content from the AI message as a string."""
text_blocks = [block for block in self.content if block["type"] == "text"]
text_blocks = [block for block in self.content if block.get("type") == "text"]
if text_blocks:
return "".join(block["text"] for block in text_blocks)
return None
@ -213,8 +214,8 @@ class AIMessageChunk(AIMessage):
during streaming generation. Contains partial content and metadata.
Attributes:
type: Message type identifier, always ``'ai_chunk'``.
id: Unique identifier for the message chunk.
type: Message type identifier, always "ai_chunk".
name: Optional human-readable name for the message.
content: List of content blocks containing partial message data.
tool_call_chunks: Optional list of partial tool call data.
@ -361,7 +362,7 @@ class AIMessageChunk(AIMessage):
text_blocks = [
block
for block in self.content
if block["type"] == "reasoning" and "reasoning" in block
if block.get("type") == "reasoning" and "reasoning" in block
]
if text_blocks:
return "".join(block["reasoning"] for block in text_blocks)
@ -372,7 +373,9 @@ class AIMessageChunk(AIMessage):
"""Get the tool calls made by the AI."""
if self._tool_calls:
return self._tool_calls
tool_calls = [block for block in self.content if block["type"] == "tool_call"]
tool_calls = [
block for block in self.content if block.get("type") == "tool_call"
]
if tool_calls:
self._tool_calls = tool_calls
return self._tool_calls
@ -383,7 +386,7 @@ class AIMessageChunk(AIMessage):
self._tool_calls = value
def __add__(self, other: Any) -> "AIMessageChunk":
"""Add AIMessageChunk to this one."""
"""Add ``AIMessageChunk`` to this one."""
if isinstance(other, AIMessageChunk):
return add_ai_message_chunks(self, other)
if isinstance(other, (list, tuple)) and all(
@ -394,7 +397,7 @@ class AIMessageChunk(AIMessage):
raise NotImplementedError(error_msg)
def to_message(self) -> "AIMessage":
"""Convert this AIMessageChunk to an AIMessage."""
"""Convert this ``AIMessageChunk`` to an AIMessage."""
return AIMessage(
content=self.content,
id=self.id,
@ -411,7 +414,7 @@ class AIMessageChunk(AIMessage):
def add_ai_message_chunks(
left: AIMessageChunk, *others: AIMessageChunk
) -> AIMessageChunk:
"""Add multiple AIMessageChunks together."""
"""Add multiple ``AIMessageChunks`` together."""
if not others:
return left
content = merge_content(
@ -498,10 +501,10 @@ class HumanMessage:
or other content types like images.
Attributes:
type: Message type identifier, always ``'human'``.
id: Unique identifier for the message.
content: List of content blocks containing the user's input.
name: Optional human-readable name for the message.
type: Message type identifier, always "human".
"""
id: str
@ -558,7 +561,7 @@ class HumanMessage:
Concatenated string of all text blocks in the message.
"""
return "".join(
block["text"] for block in self.content if block["type"] == "text"
block["text"] for block in self.content if block.get("type") == "text"
)
@ -570,9 +573,9 @@ class SystemMessage:
behavior and understanding of the conversation.
Attributes:
type: Message type identifier, always ``'system'``.
id: Unique identifier for the message.
content: List of content blocks containing system instructions.
type: Message type identifier, always "system".
"""
id: str
@ -604,7 +607,7 @@ class SystemMessage:
custom_role: Optional[str] = None
"""If provided, a custom role for the system message.
Example: ``"developer"``.
Example: ``'developer'``.
Integration packages may use this field to assign the system message role if it
contains a recognized value.
@ -637,7 +640,7 @@ class SystemMessage:
def text(self) -> str:
"""Extract all text content from the system message."""
return "".join(
block["text"] for block in self.content if block["type"] == "text"
block["text"] for block in self.content if block.get("type") == "text"
)
@ -649,12 +652,12 @@ class ToolMessage:
including the result data and execution status.
Attributes:
type: Message type identifier, always ``'tool'``.
id: Unique identifier for the message.
tool_call_id: ID of the tool call this message responds to.
content: The result content from tool execution.
artifact: Optional app-side payload not intended for the model.
status: Execution status ("success" or "error").
type: Message type identifier, always "tool".
"""
id: str
@ -713,7 +716,7 @@ class ToolMessage:
id: Optional unique identifier for the message.
name: Optional human-readable name for the message.
artifact: Optional app-side payload not intended for the model.
status: Execution status ("success" or "error").
status: Execution status (``'success'`` or ``'error'``).
"""
self.id = _ensure_id(id)
self.tool_call_id = tool_call_id
@ -729,7 +732,7 @@ class ToolMessage:
def text(self) -> str:
"""Extract all text content from the tool message."""
return "".join(
block["text"] for block in self.content if block["type"] == "text"
block["text"] for block in self.content if block.get("type") == "text"
)
def __post_init__(self) -> None: