# anthropic-ai

> A legacy robots.txt token from before Anthropic consolidated on ClaudeBot. It is still widely present in robots.txt files and costs nothing to keep, but it is a control token rather than a bot you will see in logs.

| field | value |
|---|---|
| operator | Anthropic |
| category | AI training crawlers |
| robots.txt token | `anthropic-ai` |
| user-agent contains | `anthropic-ai` |
| robots.txt | control token only — no crawler |
| verify by | no published verification method |
| published IP ranges | none published |
| prefixes mirrored | 0 IPv4 / 0 IPv6 |
| operator docs | https://support.anthropic.com/en/articles/8896518 |
| last reviewed | 2026-09-01 |

## What blocking it costs you

None. Nothing crawls under this name today; keeping the rule is harmless insurance.

## Full user-agent string

```
(no live crawler currently identifies with this string)
```

## Block it

```
User-agent: anthropic-ai
Disallow: /
```

## Allow it

```
User-agent: anthropic-ai
Allow: /
```

JSON: https://www.pathwren.workers.dev/crawler/anthropic-ai.json · index: https://www.pathwren.workers.dev/llms.txt