What does the `STABLY-...` value mean?

It is Stably's default user-agent format, with a unique identifier appended. A workspace can replace that value with a custom user agent.

Why can one test create many requests?

The headless browser follows the test flow and loads each page's resources. It may also call application endpoints as the flow moves through the interface.

Does Stably respect robots.txt?

The bot record marks robots support, but Stably's public documentation does not explain that behavior. A custom user agent may also prevent the `Stably` rule from matching.

Is Stably an AI crawler?

No. Stably can use AI inside its testing browser, but it is not documented as collecting pages for AI search or model training.

Stably: What It Is & How to Handle It

What is Stably?

Stably traffic comes from an automated end-to-end test aimed at a website or web application. A Stably user defines the flow so the browser can check that it still works after a change.

The test runs in a headless browser. One execution can request several pages, application endpoints, and the resources those pages load. Those requests belong to the chosen test flow rather than a crawler discovering content for a public index.

Stably's documented default user agent is STABLY-{unique-identifier}. A workspace can replace it with a standard browser string or another custom value, so some Stably runs will not carry the recognizable token. The documentation covers custom headers and IP allowlisting; Cloudflare Zero Trust setups can use a service token.

Stably may use AI to operate its testing browser, but its visits are not documented as input to AI search or model training. The traffic exists to test a user flow for the Stably customer. Allowing it has no direct effect on whether an AI system discovers or cites the site.

Not relevant for AI search

Is Stably relevant for AI search?

No. Stably is not part of AI search or training, so allowing or blocking it does not change your AI visibility.

Stably runs synthetic monitoring or uptime checks on a schedule. It is not collecting content for any index or model, so it has no bearing on search rankings or AI answers. You usually see it because your own team or a service you use set up a check.

How to handle Stably

Allow the browser on the environments and routes where your team expects Stably tests. When a WAF or access layer rejects it, use the configured user agent, a dedicated header or service token, or Stably's current IP allowlist. Keep any exception limited to the test environment and required paths.

The recorded token permits a robots rule such as:

User-agent: Stably
Disallow: /

The bot record says Stably respects robots.txt, but the operator documentation reviewed for this entry does not describe robots handling. Workspaces can also hide the token behind a custom user agent. Pause or remove the test in Stably when you need a dependable stop; a robots rule may only catch runs that retain the recognizable identity.

Examples

A checkout test opens a product page, calls the cart endpoint, loads the payment form, and reaches the confirmation page under one `STABLY-...` identifier.
A staging login test stops at a Cloudflare challenge, so the QA team adds a narrowly scoped service token in Stably's browser settings and runs it again.

Frequently asked questions about Stably

Learn about AI visibility monitoring and how Promptwatch helps your brand succeed in AI search.

A Stably user or automated test run targeted the site for browser-based QA. Check your engineering and QA projects before treating it as unsolicited crawling.