anthropic[minor]: Allow different tool types to be bound (#6712)

libs/langchain-anthropic/src/chat_models.ts

@@ -14,7 +14,6 @@ import {
 import {
   type StructuredOutputMethodOptions,
   type BaseLanguageModelInput,
-  type ToolDefinition,
   isOpenAITool,
 } from "@langchain/core/language_models/base";
 import { zodToJsonSchema } from "zod-to-json-schema";
@@ -682,45 +681,41 @@ export class ChatAnthropicMessages<
    *
    * @param {ChatAnthropicCallOptions["tools"]} tools The tools to format
    * @returns {AnthropicTool[] | undefined} The formatted tools, or undefined if none are passed.
-   * @throws {Error} If a mix of AnthropicTools and StructuredTools are passed.
    */
   formatStructuredToolToAnthropic(
     tools: ChatAnthropicCallOptions["tools"]
   ): AnthropicTool[] | undefined {
     if (!tools || !tools.length) {
       return undefined;
     }
-
-    // eslint-disable-next-line @typescript-eslint/no-explicit-any
-    if ((tools as any[]).every((tool) => isAnthropicTool(tool))) {
-      // If the tool is already an anthropic tool, return it
-      return tools as AnthropicTool[];
-    }
-
-    // eslint-disable-next-line @typescript-eslint/no-explicit-any
-    if ((tools as any[]).every((tool) => isOpenAITool(tool))) {
-      // Formatted as OpenAI tool, convert to Anthropic tool
-      return (tools as ToolDefinition[]).map((tc) => ({
-        name: tc.function.name,
-        description: tc.function.description,
-        input_schema: tc.function.parameters as AnthropicTool.InputSchema,
-      }));
-    }
-
-    // eslint-disable-next-line @typescript-eslint/no-explicit-any
-    if ((tools as any[]).some((tool) => isAnthropicTool(tool))) {
-      throw new Error(`Can not pass in a mix of tool schemas to ChatAnthropic`);
-    }
-
-    if (tools.every(isLangChainTool)) {
-      return tools.map((t) => ({
-        name: t.name,
-        description: t.description,
-        input_schema: zodToJsonSchema(t.schema) as AnthropicTool.InputSchema,
-      }));
-    }
-
-    throw new Error("Unsupported tool type passed to ChatAnthropic");
+    return tools.map((tool) => {
+      if (isAnthropicTool(tool)) {
+        return tool;
+      }
+      if (isOpenAITool(tool)) {
+        return {
+          name: tool.function.name,
+          description: tool.function.description,
+          input_schema: tool.function.parameters as AnthropicTool.InputSchema,
+        };
+      }
+      if (isLangChainTool(tool)) {
+        return {
+          name: tool.name,
+          description: tool.description,
+          input_schema: zodToJsonSchema(
+            tool.schema
+          ) as AnthropicTool.InputSchema,
+        };
+      }
+      throw new Error(
+        `Unknown tool type passed to ChatAnthropic: ${JSON.stringify(
+          tool,
+          null,
+          2
+        )}`
+      );
+    });
   }
 
   override bindTools(

libs/langchain-anthropic/src/tests/chat_models-tools.int.test.ts

@@ -461,3 +461,30 @@ test("streaming with structured output", async () => {
   }
   expect(typeof finalChunk2).toEqual("object");
 });
+
+test("Can bound and invoke different tool types", async () => {
+  const langchainTool = {
+    name: "get_weather_lc",
+    description: "Get the weather of a specific location.",
+    schema: zodSchema,
+  };
+  const openaiTool = {
+    type: "function",
+    function: {
+      name: "get_weather_oai",
+      description: "Get the weather of a specific location.",
+      parameters: zodToJsonSchema(zodSchema),
+    },
+  };
+  const anthropicTool = {
+    name: "get_weather_ant",
+    description: "Get the weather of a specific location.",
+    input_schema: zodToJsonSchema(zodSchema),
+  };
+  const tools = [langchainTool, openaiTool, anthropicTool];
+  const modelWithTools = model.bindTools(tools);
+  const result = await modelWithTools.invoke(
+    "Whats the current weather in san francisco?"
+  );
+  expect(result.tool_calls?.length).toBeGreaterThanOrEqual(1);
+});