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_build_final_ai_message_content() — langchain Function Reference

Architecture documentation for the _build_final_ai_message_content() function in tool_call_limit.py from the langchain codebase.

Function python LangChainCore MessageInterface called by 2

Entity Profile

Dependency Diagram

graph TD
  5ac56516_2d78_c12c_204e_15f599bbc7f4["_build_final_ai_message_content()"]
  4eaf9f24_fce9_0af1_80e1_f2e4f9935aeb["tool_call_limit.py"]
  5ac56516_2d78_c12c_204e_15f599bbc7f4 -->|defined in| 4eaf9f24_fce9_0af1_80e1_f2e4f9935aeb
  700c6d44_38e2_8aac_1a33_3a6737757799["__init__()"]
  700c6d44_38e2_8aac_1a33_3a6737757799 -->|calls| 5ac56516_2d78_c12c_204e_15f599bbc7f4
  2d4474df_60a6_0dd0_a7de_afbe664f4896["after_model()"]
  2d4474df_60a6_0dd0_a7de_afbe664f4896 -->|calls| 5ac56516_2d78_c12c_204e_15f599bbc7f4
  style 5ac56516_2d78_c12c_204e_15f599bbc7f4 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/langchain_v1/langchain/agents/middleware/tool_call_limit.py lines 70–101

def _build_final_ai_message_content(
    thread_count: int,
    run_count: int,
    thread_limit: int | None,
    run_limit: int | None,
    tool_name: str | None,
) -> str:
    """Build the final AI message content for `'end'` behavior.

    This message is displayed to the user, so it should include detailed information
    about which limits were exceeded.

    Args:
        thread_count: Current thread tool call count.
        run_count: Current run tool call count.
        thread_limit: Thread tool call limit (if set).
        run_limit: Run tool call limit (if set).
        tool_name: Tool name being limited (if specific tool), or `None` for all tools.

    Returns:
        A formatted message describing which limits were exceeded.
    """
    tool_desc = f"'{tool_name}' tool" if tool_name else "Tool"
    exceeded_limits = []

    if thread_limit is not None and thread_count > thread_limit:
        exceeded_limits.append(f"thread limit exceeded ({thread_count}/{thread_limit} calls)")
    if run_limit is not None and run_count > run_limit:
        exceeded_limits.append(f"run limit exceeded ({run_count}/{run_limit} calls)")

    limits_text = " and ".join(exceeded_limits)
    return f"{tool_desc} call limit reached: {limits_text}."

Domain

Subdomains

Defined In

Called By

Source

Frequently Asked Questions

What does _build_final_ai_message_content() do?
_build_final_ai_message_content() is a function in the langchain codebase, defined in libs/langchain_v1/langchain/agents/middleware/tool_call_limit.py.
Where is _build_final_ai_message_content() defined?
_build_final_ai_message_content() is defined in libs/langchain_v1/langchain/agents/middleware/tool_call_limit.py at line 70.
What calls _build_final_ai_message_content()?
_build_final_ai_message_content() is called by 2 function(s): __init__, after_model.

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