Using Claude Code's web_search Tool: What Actually Works

What is web_search in Claude Code?

Claude Code ships with a built-in web_search tool — it lets Claude search the web in real time during a coding session. Instead of having outdated training data about a library, Claude can look up the latest docs, check for breaking changes, or find Stack Overflow answers.

This isn't a plugin — it's part of Claude Code's native MCP (Model Context Protocol) tool stack.

The catch: most providers block it

Claude Code's web_search routes through Anthropic's MCP infrastructure. This requires specific account-level authorization on the upstream provider. Many API resellers route through accounts that don't have this authorization — so the tool silently fails or returns an error.

You can test it by asking Claude Code to search for something: search for the latest React 19 release notes. If web_search is working, Claude will use the tool and show you real-time results. If it's blocked, it'll either refuse or fall back to training data.

How to verify your provider supports it

> search the web for the current date and today's top news

If you get current, accurate results — it works. If Claude says something like "I don't have access to real-time information" while appearing to try a tool — it's blocked.

Why Antex supports it

Antex routes web_search requests through dedicated KIRO_DESKTOP social-login accounts that have the necessary authorization. These accounts are separate from the general chat pool — chat traffic doesn't compete with web_search traffic, so neither is affected by the other's rate limits.

web_fetch vs web_search

Claude Code exposes two web-related tools:

• web_search — queries a search engine, returns links and snippets
• web_fetch — fetches the content of a specific URL

Both are available on Antex. Some providers support search but not fetch, or vice versa.

Practical uses in Claude Code

• Looking up API documentation for a library you're using
• Checking if a package has breaking changes in a new version
• Finding GitHub issues related to an error you're seeing
• Getting the latest security advisories for a dependency
• Checking current pricing or availability for a service