What is ProjectShield-UrlCheck?
ProjectShield-UrlCheck is a security scanner that monitors websites protected by Google's Project Shield service, checking for malicious traffic and DDoS attacks to ensure continuous protection. You can set up Agent Analytics to see when ProjectShield-UrlCheck visits your website.
Category
| Example User Agent | Mozilla/5.0 (compatible; ProjectShield-UrlCheck; +http://g.co/projectshield) |
| Operated By | |
| Source | Official Website |
| Triggered By | Scheduled or requested scan |
| Used for AI Model Training | Not expected |
| Affects AI Chat & Search Visibility | Not directly |
| Expected To Follow Robots.txt | Yes |
Why Is ProjectShield-UrlCheck Visiting My Website?
ProjectShield-UrlCheck is scanning your site for vulnerabilities, either as part of an internet-wide sweep or because someone requested an assessment of your domain. Recurring visits often indicate that a monitoring service has added your site to its checks.
Should I Block ProjectShield-UrlCheck?
Usually not, unless you already run your own security scans and want cleaner logs. ProjectShield-UrlCheck checks for exposed vulnerabilities, and some services report their findings to site owners at no cost. For context, 7% of the top websites we track currently have robots.txt rules for ProjectShield-UrlCheck.
How Do I Block ProjectShield-UrlCheck Using Robots.txt?
Add this rule to your robots.txt file to block ProjectShield-UrlCheck from accessing your website, or use Automatic Robots.txt to block all security scanners at once. You can customize which pages are blocked by swapping out / for a different path.
User-agent: ProjectShield-UrlCheck # https://knownagents.com/agents/projectshield-urlcheck
Disallow: /Insights for ProjectShield-UrlCheck
As of October 29, 2026, this data reflects agent visits measured across thousands of websites using Agent Analytics, combined with daily scans of the top 1000 websites and their robots.txt files.
Robots.txt Compliance
Country of Origin
Robots.txt Blocked Percentage
ProjectShield-UrlCheck Traffic
Frequently Asked Questions
What Traffic Patterns Should I Expect From ProjectShield-UrlCheck?
ProjectShield-UrlCheck's cadence depends on how the scan is configured. Continuous monitoring may run daily or hourly, while a one-time or internet-wide scan may sweep once and disappear.
Does ProjectShield-UrlCheck Follow Robots.txt Rules?
ProjectShield-UrlCheck is expected to follow robots.txt rules, so a disallow rule is the appropriate first step if you want to block it. Automatic Robots.txt can add and maintain that rule, while Agent Analytics lets you verify whether ProjectShield-UrlCheck respects it.
Is ProjectShield-UrlCheck Used for AI Model Training?
Not ordinarily. ProjectShield-UrlCheck is not categorized as an AI training scraper or data provider, so AI model training is not its expected purpose.
Does Blocking ProjectShield-UrlCheck Affect AI Search or Citations?
Not directly. ProjectShield-UrlCheck's expected purpose is not to supply an AI search index or retrieve pages for AI-generated answers.
Does ProjectShield-UrlCheck Access Private Content?
It deliberately looks for exposed private content. ProjectShield-UrlCheck tests login pages, admin panels, and API endpoints for vulnerabilities. Probing does not mean it gained access, but you should expect requests to sensitive paths in your logs.
How Can I Verify a Request From ProjectShield-UrlCheck?
Agent Analytics tracks ProjectShield-UrlCheck visits in real time. You can also check your server logs for requests whose user-agent string contains "ProjectShield-UrlCheck". Look for bursts of requests to uncommon paths that ordinary visitors rarely access. Because ProjectShield-UrlCheck does not publish a verification method, any client can claim its identity and a log match is only a clue.
How Is ProjectShield-UrlCheck Different From Other Google Agents?
Google operates separate agents for different purposes, so each agent should be evaluated and controlled independently.
- Google-Agent: Google-Agent is used by agents hosted on Google infrastructure to navigate the web and perform actions upon user request.
- GoogleAgent-Mariner: GoogleAgent-Mariner is an AI agent created by Google that can use a web browser. It can intelligently navigate and interact with websites to complete multi-step tasks on …
- Gemini-Deep-Research: Gemini-Deep-Research is the agent responsible for collecting and scanning resources used in Google Gemini's Deep Research feature, which acts as a personal research assis…
- Google-NotebookLM: Google-NotebookLM is an AI-powered research and note-taking assistant that helps users synthesize information from uploaded sources like documents, transcripts, or web co…
- GoogleAgent-URLContext: GoogleAgent-URLContext is a web fetcher operated by Google that retrieves web content on behalf of Gemini API users. When a developer provides a URL as context in a Gemin…