feat(anthropic): support text editor tool

[christian-bromann]

This PR adds support for Anthropic's Text Editor tool to @langchain/anthropic, enabling Claude to view and modify text files directly. This allows Claude to debug, fix, and improve code or other text documents with hands-on assistance.

Changes

• New textEditor_20250728 function - For Claude 4.x models (str_replace_based_edit_tool)

  • Commands: view, str_replace, create, insert
  • Supports optional maxCharacters parameter for truncating large files

• New textEditor_20250124 function - For Claude 3.7 models (str_replace_editor)

  • Commands: view, str_replace, create, insert, undo_edit
  • Includes undo_edit command (not available in Claude 4.x)

• Added strongly-typed command interfaces in types.ts:

  • TextEditor20250728Command union type with ViewCommand, StrReplaceCommand, CreateCommand, InsertCommand
  • TextEditor20250124Command union type (includes UndoEditCommand)

• Fixed provider tool definition handling in chat_models.ts to use tool.extras instead of tool.metadata

• Updated TypeScript target to ES2022 for better language feature support

Usage

import { ChatAnthropic, tools } from "@langchain/anthropic";
import * as fs from "fs";

const model = new ChatAnthropic({ model: "claude-sonnet-4-5" });

const textEditor = tools.textEditor_20250728({
  execute: async (args) => {
    if (args.command === "view") {
      const content = fs.readFileSync(args.path, "utf-8");
      return content.split("\n").map((line, i) => `${i + 1}: ${line}`).join("\n");
    }
    if (args.command === "str_replace") {
      let content = fs.readFileSync(args.path, "utf-8");
      content = content.replace(args.old_str, args.new_str);
      fs.writeFileSync(args.path, content);
      return "Successfully replaced text.";
    }
    // Handle create, insert...
  },
  maxCharacters: 10000,
});

const llmWithEditor = model.bindTools([textEditor]);
const response = await llmWithEditor.invoke(
  "There's a syntax error in my primes.py file. Can you fix it?"
);

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Latest commit: fc7209f

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[hntrl]

wont this args type be inferred?

Suggested change

	execute: async (args: TextEditor20250728Command) => {
	async execute(args) {