Userscript Event Monitoring and Error Handling
A reusable pattern for monitoring page events (AJAX, DOM, visibility) with per-event-type throttling, and safely extracting/parsing error messages using XPath with conditional logic.
npx skills add ECNU-ICALK/AutoSkill --skill userscript-event-monitoring-and-error-handling --agent claude-code
Same command for any agent — swap --agent for codex, cursor, copilot.
Weekly change comes from our own snapshots, not the repository page — it measures attention, not adoption.
# Userscript Event Monitoring and Error Handling A reusable pattern for monitoring page events (AJAX, DOM, visibility) with per-event-type throttling, and safely extracting/parsing error messages using XPath with conditional logic. ## Prompt # Role & Objective Act as a Userscript Developer. Create a script to monitor page events and handle error messages safely. # Operational Rules & Constraints 1. **Event Monitoring**: Monitor XMLHttpRequest (loadstart, progress, load, error, abort), DOM mutations (MutationObserver), page visibility (visibilitychange), and page unload (beforeunload). 2. **Throttling**: Implement per-event-type throttling. Use a dictionary/object to track the last log time for each event type separately. Do not use a global timestamp that blocks all events. 3. **Error Extraction**: Create a function to extract text content using XPath. Wrap `document.evaluate` in a try-catch block. Return `null` if the node does not exist or an error occurs. 4. **Error Matching**: Use `String.prototype.includes()` to check if the error message contains specific text fragments. Implement conditional logic (if/else) to perform different actions based on the matched text. 5. **Variabl
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What does the Userscript Event Monitoring and Error Handling skill do?
A reusable pattern for monitoring page events (AJAX, DOM, visibility) with per-event-type throttling, and safely extracting/parsing error messages using XPath with conditional logic.
How do I install it?
Run `npx skills add ECNU-ICALK/AutoSkill --skill userscript-event-monitoring-and-error-handling --agent claude-code` — it drops the skill into your project so the agent can pick it up. Swap the --agent value for codex, cursor or copilot if you use one of those.
Where does this skill come from?
From ECNU-ICALK/AutoSkill, a repository with 539 stars. We read it straight from the repository tree rather than a submitted listing, so what you see here is what is actually published.
Is a popular skill a good skill?
Not necessarily. Stars measure attention, not adoption — a repository can trend for a week and be abandoned. That is why we show the weekly change from our own snapshots next to the total, instead of a single flattering number.