What is Bugsnag script fetcher?
Bugsnag script fetcher is a bot operated by Bugsnag, an error monitoring and reporting platform for software applications. This bot fetches JavaScript source files and source maps from websites to help developers debug errors by providing readable stack traces. Agent Analytics can track when it visits your website.
Overview
| Operated By | Bugsnag |
| Expected To Follow Robots.txt | No |
| Insights Last Updated | August 11, 2026 |
Do you operate this agent? Contact us to suggest an update.
Category
Expected Behavior
Bugsnag script fetcher's traffic often follows fixed intervals like a cron job. Activity may consist of short recurring checks or occasional intensive bursts, but it usually remains limited to a specific set of pages or endpoints.
How To Block Bugsnag script fetcher With Robots.txt
Add this rule to your robots.txt file to request that Bugsnag script fetcher not access your website, or use Automatic Robots.txt to request the same of all developer helpers at once. You can customize which pages are blocked by swapping out / for a different path.
User-agent: Bugsnag script fetcher # https://knownagents.com/agents/bugsnag-script-fetcher
Disallow: /Global Statistics for Bugsnag script fetcher
As of August 11, 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 Blocked Percentage
Country of Origin
Robots.txt Blocking Trend
0% of top websites block Bugsnag script fetcher in their robots.txt files.
Overall Developer Helper Traffic
0.3% of all web traffic came from developer helpers.
Frequently Asked Questions
Should I Block Bugsnag script fetcher?
Only if no one on your team relies on it. Bugsnag script fetcher may support uptime monitoring, performance tests, or audits. Blocking it without checking first can silently disrupt those workflows. Almost none of the top websites we track currently have robots.txt rules for Bugsnag script fetcher.
Does Bugsnag script fetcher Follow Robots.txt Rules?
No. Bugsnag script fetcher is not expected to follow robots.txt directives, so a disallow rule only communicates your preference. Enforce the block with firewall or server rules, then use Agent Analytics to verify that its requests stop.
Does Bugsnag script fetcher Access Private Content?
Only when configured with access. A team may grant Bugsnag script fetcher credentials to monitor staging sites or private health endpoints. Without those credentials, it sees only public pages.
Why Is Bugsnag script fetcher Visiting My Website?
Someone, most likely on your own team, configured Bugsnag script fetcher to check your site. Uptime monitors, performance testers, and audit tools visit only the sites or endpoints they are told to watch.
How Can I Tell if Bugsnag script fetcher Is Visiting My Website?
Agent Analytics tracks Bugsnag script fetcher visits in real time alongside every other known AI agent, crawler, and scraper. You can also check your server logs for requests whose user-agent string contains "Bugsnag script fetcher". Look for repeated checks of the same pages or endpoints at regular intervals. Because Bugsnag script fetcher does not publish a verification method, any client can claim its identity and a log match is only a clue.