---
title: "Claude in Chrome: user agent and token | Agent Ready Crawlers"
description: "Claude in Chrome from Anthropic: no robots.txt token, task agent purpose and what a site can check; no exact user-agent string is published. Read 2026-11-04."
canonical: https://agentreadycrawlers.com/crawlers/claude-in-chrome
site: "Agent Ready Crawlers"
last_updated: 2026-11-04
section: "Crawlers"
---

# Claude in Chrome: user agent and token | Agent Ready Crawlers

> Claude in Chrome from Anthropic: no robots.txt token, task agent purpose and what a site can check; no exact user-agent string is published. Read 2026-11-04.

Source: https://agentreadycrawlers.com/crawlers/claude-in-chrome
Site: Agent Ready Crawlers
Last reviewed: 2026-11-04

Browsing agent from Anthropic

# Claude in Chrome

In short

Claude in Chrome is Anthropic's browsing agent. Claude in Chrome has no robots.txt token, so robots.txt cannot address it and the crawl cannot measure a block rate. The operator publishes nothing a site can check. Browser extension; Anthropic documents user-side controls only. No robots.txt behaviour or site-side opt-out is documented on the Anthropic pages read (checked 2026-11-04).

Operator

[Anthropic](https://agentreadycrawlers.com/crawlers/operator/anthropic/) Vendor profile: [Anthropic](https://agentreadycrawlers.com/vendors/anthropic/)

Purpose

Task agent [All task agent rows](https://agentreadycrawlers.com/crawlers/purpose/task-agent/). A browsing agent that clicks, fills forms and finishes a job for a person.

User-agent string

No exact string is published. What the operator or a third party says: The user's own Chrome user agent; no agent token

robots.txt token

None. No robots.txt line can address this agent.

Respects robots.txt

No statement

No robots.txt behaviour or site-side opt-out is documented on the Anthropic pages read (checked 2026-11-04). [Source](https://claude.com/docs/third-party/claude-desktop/browser), read 2026-11-04.

Verification

Nothing published

The operator publishes no list, reverse DNS pattern or key directory a site owner can check. [Documentation](https://support.claude.com/en/articles/12012173-getting-started-with-claude-in-chrome), read 2026-11-04.

IP ranges

Not published.

Rate behaviour

Runs in the user's browser with the user's tabs, sign-ins and IP address.

Block rate

None: the agent has no token, so a robots.txt block rate does not exist.

Documentation

[claude.com](https://claude.com/docs/third-party/claude-desktop/browser), read 2026-11-04.

Note. Browser extension; Anthropic documents user-side controls only. Third-party detection vendors flag it by behaviour, not identity (https://www.centinelanalytica.com/blog/ai-browser-agents).

## Allow and refuse lines

This agent has no robots.txt token, so there are no lines to copy. Without a token, a published list or a signature, a site owner cannot tell it from an ordinary visitor by request alone.

Refusing or allowing in robots.txt states a preference. For this row the operator or its documentation says robots.txt may not govern the fetch, so enforcement belongs in your WAF.

## Anthropic in the Verification Ledger

One shared IP list for all three bots; no key directory at claude.ai or claude.com (404, 2026-11-04); nothing for Claude in Chrome. [All operators](https://agentreadycrawlers.com/verification/).

IP lists

-   [claude.com/crawling/bots.json](https://claude.com/crawling/bots.json)

Reverse DNS

publishes nothing

Key directory

publishes nothing

Cloudflare

not confirmed on Radar (directory slug not found, 2026-11-04)

Visa TAP registry

no public operator-level registration found (checked 2026-11-04)

Mastercard Agent Pay

no public operator-level registration found (checked 2026-11-04)

## Other Anthropic rows

-   [ClaudeBot](https://agentreadycrawlers.com/crawlers/claudebot/) Training token ClaudeBot
-   [Claude-User](https://agentreadycrawlers.com/crawlers/claude-user/) Live answer fetch token Claude-User
-   [Claude-SearchBot](https://agentreadycrawlers.com/crawlers/claude-searchbot/) Search index token Claude-SearchBot
-   [anthropic-ai (legacy token)](https://agentreadycrawlers.com/crawlers/anthropic-ai/) Training token anthropic-ai
-   [Claude Duet cloud browser](https://agentreadycrawlers.com/crawlers/claude-duet/) Task agent token Claude-Agent
-   [Claude computer use (API tool)](https://agentreadycrawlers.com/crawlers/claude-computer-use/) Task agent no token

## Sources

-   [claude.com: browser](https://claude.com/docs/third-party/claude-desktop/browser) read 2026-11-04
-   [support.claude.com: 12012173 getting started with claude in chrome](https://support.claude.com/en/articles/12012173-getting-started-with-claude-in-chrome) read 2026-11-04
-   [Does Anthropic crawl data from the web, and how can site owners block the crawler?](https://support.claude.com/en/articles/8896518-does-anthropic-crawl-data-from-the-web-and-how-can-site-owners-block-the-crawler) read 2026-11-04

Last reviewed 2026-11-04