IMPROVEMENT Passthrough kwargs in runnable lambda (#13405)

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libs/langchain/langchain/schema/runnable/base.py

@@ -2437,8 +2437,11 @@ class RunnableLambda(Runnable[Input, Output]):
         input: Input,
         run_manager: CallbackManagerForChainRun,
         config: RunnableConfig,
+        **kwargs: Any,
     ) -> Output:
-        output = call_func_with_variable_args(self.func, input, config, run_manager)
+        output = call_func_with_variable_args(
+            self.func, input, config, run_manager, **kwargs
+        )
         # If the output is a runnable, invoke it
         if isinstance(output, Runnable):
             recursion_limit = config["recursion_limit"]
@@ -2461,9 +2464,10 @@ class RunnableLambda(Runnable[Input, Output]):
         input: Input,
         run_manager: AsyncCallbackManagerForChainRun,
         config: RunnableConfig,
+        **kwargs: Any,
     ) -> Output:
         output = await acall_func_with_variable_args(
-            self.afunc, input, config, run_manager
+            self.afunc, input, config, run_manager, **kwargs
         )
         # If the output is a runnable, invoke it
         if isinstance(output, Runnable):
@@ -2509,6 +2513,7 @@ class RunnableLambda(Runnable[Input, Output]):
                 self._invoke,
                 input,
                 self._config(config, self.func),
+                **kwargs,
             )
         else:
             raise TypeError(
@@ -2528,6 +2533,7 @@ class RunnableLambda(Runnable[Input, Output]):
                 self._ainvoke,
                 input,
                 self._config(config, self.afunc),
+                **kwargs,
             )
         else:
             # Delegating to super implementation of ainvoke.