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_is_message_content_block() — langchain Function Reference

Architecture documentation for the _is_message_content_block() function in base.py from the langchain codebase.

Function python AgentOrchestration ToolInterface called by 1

Entity Profile

Dependency Diagram

graph TD
  64a8d1bb_a7d8_b2fb_33c5_60cdd93b87a6["_is_message_content_block()"]
  80cebff4_efbd_4311_85e9_de0dc81a7eee["base.py"]
  64a8d1bb_a7d8_b2fb_33c5_60cdd93b87a6 -->|defined in| 80cebff4_efbd_4311_85e9_de0dc81a7eee
  8e2aa8da_dbf5_6b94_c484_cfc2e4ce5b93["_is_message_content_type()"]
  8e2aa8da_dbf5_6b94_c484_cfc2e4ce5b93 -->|calls| 64a8d1bb_a7d8_b2fb_33c5_60cdd93b87a6
  style 64a8d1bb_a7d8_b2fb_33c5_60cdd93b87a6 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/core/langchain_core/tools/base.py lines 1298–1313

def _is_message_content_block(obj: Any) -> bool:
    """Check if object is a valid message content block.

    Validates content blocks for OpenAI or Anthropic format.

    Args:
        obj: The object to check.

    Returns:
        `True` if the object is a valid content block, `False` otherwise.
    """
    if isinstance(obj, str):
        return True
    if isinstance(obj, dict):
        return obj.get("type", None) in TOOL_MESSAGE_BLOCK_TYPES
    return False

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Frequently Asked Questions

What does _is_message_content_block() do?
_is_message_content_block() is a function in the langchain codebase, defined in libs/core/langchain_core/tools/base.py.
Where is _is_message_content_block() defined?
_is_message_content_block() is defined in libs/core/langchain_core/tools/base.py at line 1298.
What calls _is_message_content_block()?
_is_message_content_block() is called by 1 function(s): _is_message_content_type.

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