__call__() — langchain Function Reference
Architecture documentation for the __call__() function in test_tool_retry.py from the langchain codebase.
Entity Profile
Dependency Diagram
graph TD 3d016a54_d4ea_ddef_e2d2_8a841962e009["__call__()"] d303b4e8_4b2c_6f16_ce41_c54b9e9fbbe0["TemporaryFailureTool"] 3d016a54_d4ea_ddef_e2d2_8a841962e009 -->|defined in| d303b4e8_4b2c_6f16_ce41_c54b9e9fbbe0 style 3d016a54_d4ea_ddef_e2d2_8a841962e009 fill:#6366f1,stroke:#818cf8,color:#fff
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Source Code
libs/langchain_v1/tests/unit_tests/agents/middleware/implementations/test_tool_retry.py lines 46–62
def __call__(self, value: str) -> str:
"""Execute the tool.
Args:
value: Input string.
Returns:
Success message if attempt >= fail_count.
Raises:
ValueError: If attempt < fail_count.
"""
self.attempt += 1
if self.attempt <= self.fail_count:
msg = f"Temporary failure {self.attempt}"
raise ValueError(msg)
return f"Success after {self.attempt} attempts: {value}"Domain
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Frequently Asked Questions
What does __call__() do?
__call__() is a function in the langchain codebase, defined in libs/langchain_v1/tests/unit_tests/agents/middleware/implementations/test_tool_retry.py.
Where is __call__() defined?
__call__() is defined in libs/langchain_v1/tests/unit_tests/agents/middleware/implementations/test_tool_retry.py at line 46.
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