ChatAnthropic `ContentBlock.Tools.ServerToolCallResult` missing critical details and metadata for Web Search

Author: aaronjwhiteside-appdirectCreated Feb 2, 2026Updated Sep 8, 2026

Labelsbug

Checked other resources

This is a bug, not a usage question. For questions, please use the LangChain Forum (https://forum.langchain.com/).
I added a very descriptive title to this issue.
I searched the LangChain.js documentation with the integrated search.
I used the GitHub search to find a similar question and didn't find it.
I am sure that this is a bug in LangChain.js rather than my code.
The bug is not resolved by updating to the latest stable version of LangChain (or the specific integration package).

Example Code

typescript

import { ChatAnthropic } from "@langchain/anthropic";
import { ContentBlock, HumanMessage, SystemMessage } from "@langchain/core/messages";
import dotenv from "dotenv";

dotenv.config({ path: "xxxxx/.env" });

const main = async () => {
  const model = new ChatAnthropic({
    model: "claude-sonnet-4-5",
    apiKey: process.env.ANTHROPIC_API_KEY!,
    clientOptions: {
      fetch: async (url: string | RequestInfo | URL, init?: RequestInit) => {
        console.log("request", init?.body);
        return fetch(url, init);
      },
    },
  });
  const modelWithTools = model.bindTools([
    {
      type: "web_search_20250305",
      name: "web_search",
      max_uses: 5,
    },
  ]);

  const messages = [
    new SystemMessage({
      content: "You are a helpful assistant that answers questions about the world.",
    }),
    new HumanMessage({
      contentBlocks: [{ type: "text", text: "latest news in Melbourne Australia" } satisfies ContentBlock.Text],
    }),
  ];

  const response = await modelWithTools.invoke(messages);
  console.log("content", JSON.stringify(response.content));
  console.log("contentBlocks", JSON.stringify(response.contentBlocks));
};

void main();

Error Message and Stack Trace (if applicable)

contentBlock contains

json

  {
    "type": "server_tool_call_result",
    "name": "web_search",
    "toolCallId": "srvtoolu_01KjdakV81yBhF3deU73QGkP",
    "status": "success",
    "output": {
      "urls": [
        "https://news.google.com/home?hl=en-AU&gl=AU&ceid=AU%3Aen",
        "https://www.melbourne.vic.gov.au/melbourne-news",
        "https://au.news.yahoo.com/vic/",
        "https://ausopen.com/",
        "https://www.cnn.com/world/australia",
        "https://www.police.vic.gov.au/breaking-news",
        "https://10.com.au/news/melbourne",
        "https://www.sbs.com.au/news",
        "https://x.com/9NewsMelb",
        "https://www.unimelb.edu.au/newsroom"
      ]
    }
  },

while content contains:

json

{
    "type": "web_search_tool_result",
    "tool_use_id": "srvtoolu_01KjdakV81yBhF3deU73QGkP",
    "content": [
      {
        "type": "web_search_result",
        "title": "Google News",
        "url": "https://news.google.com/home?hl=en-AU&gl=AU&ceid=AU%3Aen",
        "encrypted_content": "Eu4CCioIDBgCIiRmMDJhMDM2My03NWIzLTRjYzMtYTVkZC03YTRiNTYzY2YwYjkSDOTHgIvJxp5rz46UvhoM8D8M2JqnhuF0KGHcIjBMWkOZyxn5kixdTsoIjIGDEHwUZnaJu1jQX38KB0DIk1+mK7GlPJQObqWKFTQLz8sq8QFnqiKgTm/IEVW0hSNAq7iYy40R2sHQ81DfJpe7S6n+bjaI0E4VMGx1A5rymnDqzmTMLDaRlVLnbbS6GkPzwkeRuZ+1LkJb0duuyr6NHTJMCOuYaJsYJbpOhFtvDVABwIwAyOiOIR/4NPE5OLRGO35hlaPaQvD/Hji2Lxl80jtI5PRvyN/7rmGoYGFtrDAFCRlvY5tADM0ajoOwp3PA1ppwX3ibDBuu/jJDrAiC+OOvcqdbiBsyWZC0tuI4TmWRZBSz/guDd4OogKg8fZRjJZQBV3ldJnrcckjS5LacFK3lEGhZE6DG6SrivDEUfg+iWhUJGAM=",
        "page_age": "5 hours ago"
      },
      {
        "type": "web_search_result",
        "title": "Melbourne News | City of Melbourne",
        "url": "https://www.melbourne.vic.gov.au/melbourne-news",
        "encrypted_content": "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",
        "page_age": "2 weeks ago"
      },
      {
        "type": "web_search_result",
        "title": "Melbourne News | Breaking News from Victoria",
        "url": "https://au.news.yahoo.com/vic/",
        "encrypted_content": "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",
        "page_age": "December 9, 2025"
      },
      {
        "type": "web_search_result",
        "title": "Home | AO",
        "url": "https://ausopen.com/",
        "encrypted_content": "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",
        "page_age": "2 hours ago"
      },
      {
        "type": "web_search_result",
        "title": "Australia - breaking news, video, headlines and opinion | CNN",
        "url": "https://www.cnn.com/world/australia",
        "encrypted_content": "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",
        "page_age": "December 31, 2025"
      },
      {
        "type": "web_search_result",
        "title": "Breaking news | Victoria Police",
        "url": "https://www.police.vic.gov.au/breaking-news",
        "encrypted_content": "EsgBCioIDBgCIiRmMDJhMDM2My03NWIzLTRjYzMtYTVkZC03YTRiNTYzY2YwYjkSDJuCZVb+4jochRH0hhoMpy/ED3E1tEbAbxYCIjDII/ROMGM5DptyO96mzKmat//jLLJyvuxX0coZVnQxfApeIXaK4XNG6MVoQsV868MqTOA2OAULD8VR3/MhsGZZ4i2o2AVo6KALv1/E4XqgZltnFqx3rKU84ZP2IKJgVmv7nSQWdLFD3t+we+I8FTNqyQWwGLHB5AEkZzJ8rdgYAw==",
        "page_age": "2 weeks ago"
      },
      {
        "type": "web_search_result",
        "title": "Melbourne - 10 News - Network Ten",
        "url": "https://10.com.au/news/melbourne",
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        "page_age": "3 hours ago"
      },
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        "type": "web_search_result",
        "title": "9News Melbourne (@9NewsMelb) / X",
        "url": "https://x.com/9NewsMelb",
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Source: langchain-ai/langchainjs

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