fix(agent): make responseFormat.strict configurable to allow optional tool params

Author: Nitinref

libs/langchain/src/agents/nodes/AgentNode.ts

@@ -794,7 +794,6 @@ export class AgentNode<
           (remainingSteps < 2 && hasToolCalls(state.messages.at(-1))))
     );
   }
-
   async #bindTools(
     model: LanguageModelLike,
     preparedOptions: ModelRequest | undefined,
@@ -823,6 +822,15 @@ export class AgentNode<
       preparedOptions?.toolChoice ||
       (structuredTools.length > 0 ? "any" : undefined);
 
+    /**
+     * Allow configuring the strict flag via responseFormat.
+     * If not provided, default to true (existing behavior).
+     */
+    const responseFormatStrict =
+      (this.#options.responseFormat as any)?.strict;
+    const strict =
+      typeof responseFormatStrict === "boolean" ? responseFormatStrict : true;
+
     /**
      * check if the user requests a native schema output
      */
@@ -833,7 +841,8 @@ export class AgentNode<
           structuredResponseFormat.strategy.schema
         ),
         schema: structuredResponseFormat.strategy.schema,
-        strict: true,
+        // This controls JSON schema strictness
+        strict,
       };
 
       Object.assign(options, {
@@ -845,7 +854,8 @@ export class AgentNode<
           kwargs: { method: "json_schema" },
           schema: structuredResponseFormat.strategy.schema,
         },
-        strict: true,
+        // This controls provider-level strict mode (e.g. OpenAI)
+        strict,
       });
     }
 
@@ -869,16 +879,4 @@ export class AgentNode<
 
     return modelRunnable;
   }
-
-  getState(): {
-    messages: BaseMessage[];
-  } {
-    const state = super.getState();
-    const origState = state && !(state instanceof Command) ? state : {};
-
-    return {
-      messages: [],
-      ...origState,
-    };
-  }
-}
+}