Web Change Monitor

Problem

Web pages often update silently, such as prices, stock levels, product lists, or forum posts. Manual checks are inconsistent and can miss short-lived changes. This skill turns “did this URL change?” into a repeatable monitoring task and sends Feishu notifications when a trigger occurs, which is useful for competitor launches, price tracking, inventory monitoring, and content tracking.

How It Works

The skill fetches the target page and evaluates changes by mode: hash computes MD5 over the full HTML for generic pages; keyword triggers when specified terms appear or disappear, useful for stock and price; selector compares a specific DOM element using a CSS selector, useful for product lists or search results; regex applies pattern-based conditions for more complex rules. Monitoring tasks are saved and run on schedule, while change history can be queried from the SQLite store to show time, summary, and time since last change. The implementation uses Playwright headless fetching, randomized delays, automatic retries, and supports frequencies from 15m to 24h or a custom cron expression.

Limitations

The current version does not support pages that require login; Cookie authentication is planned for a future version. URL quota, frequency, and available detection modes depend on the subscription tier. Because the skill relies on page structure and site anti-bot behavior, heavily rendered or dynamic pages may require carefully chosen selectors, keywords, or regex rules, with manual review still recommended.