What Is an AI Crawler Access Checker?

At a glance

Types of AI Crawler Access Checker

How it works

1. 1

   Fetch and parse robots.txt. The tool grabs the site's /robots.txt and works through each user-agent block, matching entries against a maintained roster of known AI crawler names — GPTBot and ChatGPT-User (OpenAI), ClaudeBot and Claude-User (Anthropic), PerplexityBot, OAI-SearchBot, Google-Extended, CCBot, Applebot-Extended, and others.

2. 2

   Sort each bot by what it's actually for. Some bots — GPTBot, Google-Extended, ClaudeBot — mainly feed AI model training, while others — OAI-SearchBot, PerplexityBot, Claude-SearchBot — power live answer and citation lookups. The tool keeps 'blocked from training' separate from 'blocked from citation,' because a site might reasonably want one and not the other.

3. 3

   Send live test requests. Reading the file only tells you what it says, so the checker also fires real HTTP requests using each bot's actual user-agent string, since CDN or WAF-level bot management can silently override robots.txt — and some crawlers just ignore the file altogether.

4. 4

   Cross-reference with server logs, where it can. More advanced tools compare stated permissions against actual access logs or CDN analytics, catching real crawl activity (or its conspicuous absence) so you can see whether a permitted bot is actually showing up.

5. 5

   Flag the contradictions. The tool surfaces conflicts — robots.txt says allow, a WAF rule says no — and gaps, like a newer AI crawler that never got mentioned in the file and is therefore allowed by default, whether or not anyone meant that.

6. 6

   Generate a directive report. You get a per-bot allow/block table plus suggested robots.txt lines to add or edit so the file actually matches what the site intends.

Why it matters

Robots.txt is the main lever sites have over AI crawler access, and it's remarkably easy to get wrong in either direction: one overly broad Disallow rule can accidentally lock out bots you wanted, like OAI-SearchBot or PerplexityBot, which power live citations — while a missing rule leaves training crawlers free to help themselves by default. With AI Overviews now appearing in roughly 50% of US Google searches by Google's own count, and engines like ChatGPT and Perplexity citing sources directly in their answers, getting blocked from the citation-focused crawlers specifically can mean quietly vanishing from a discovery channel that matters more every quarter — and plenty of sites haven't touched their robots.txt since before these bots had names.

What to look for

• Maintains an up-to-date crawler list — new AI bots show up on a regular basis, so the tool's bot database needs ongoing upkeep, not a list someone compiled once and forgot.
• Distinguishes training bots from search/citation bots — sites often want different rules for each, and a tool that lumps them together can't help you make that call.
• Tests live server response, not just the robots.txt file — CDN/WAF blocks are invisible to a file-only check, which means a file-only check can tell you everything's fine while it isn't.
• Gives copy-pasteable directive suggestions — a report that just says 'blocked' and stops there is a lot less useful than one handing you the exact line to paste in.
• Covers your specific CDN/hosting stack — bot-management behavior differs by provider (Cloudflare, Akamai, Fastly), so provider-specific guidance is a genuine plus.
• Re-checks or monitors over time — crawler lists and site configs both drift, so a one-and-done scan is stale the moment a new bot ships.

How to actually use one

1. Enter your domain into the checker and let it fetch and parse your current robots.txt.
2. Work through the per-bot table and decide, one bot at a time, whether you want it allowed or blocked — factoring in whether it's a training bot or a citation/search bot.
3. Run the live-request test, if the tool offers one, to confirm your intended rules actually hold up at the server or CDN level and aren't just wishful thinking on a text file.
4. Apply the suggested robots.txt edits, or go adjust CDN/WAF bot-management settings if that's where the real block is happening.
5. Re-run the check after you publish changes, to confirm the new rules are live and matched to the bots you actually meant.
6. Set a recurring reminder — quarterly is reasonable — since new AI crawlers keep showing up uninvited.

Common mistakes

• Blocking anything matching 'GPT' or 'AI' with one wildcard rule — a move that can take out citation-focused bots like OAI-SearchBot right alongside training bots like GPTBot, when you probably only meant to block one of them.
• Assuming robots.txt alone fully controls access — it's a voluntary convention, and CDN/WAF-level blocks (or a bot that just doesn't care what the file says) can override or sidestep it entirely.
• Never revisiting robots.txt after the day it was written, which quietly leaves out newer crawlers like OAI-SearchBot or Claude-SearchBot that didn't exist when the file was last touched.
• Confusing 'blocked from training' with 'blocked from citation' and applying one blanket rule to both, when the two usually deserve separate decisions.

Tools that offer this

Links go live as each review publishes.

Related concepts

Frequently asked questions