What Google Alerts does and does not index
| Source | Google Alerts | discatch |
|---|---|---|
| Web pages | yes | yes (waterfall) |
| News | yes | yes (waterfall) |
| Reddit post titles | yes, with lag | yes (web index today, direct planned) |
| Reddit comments | mostly no | yes (web index today, direct planned) |
| Hacker News stories | yes, with lag | yes (official API) |
| Hacker News comments | sparse | yes (official API) |
| Discourse forums | no | yes (official API) |
| GitHub issues | no | yes (official API) |
| Stack Exchange | partial | yes (official API) |
| Bluesky | no | planned |
| Mastodon | no | planned |
Source by source
Google Alerts sources are Automatic, News, Blogs, Web, Video, Books, Discussions, and Finance. It does not have per-source pages or a source list. Coverage depends entirely on what Google’s crawler reaches and indexes.
discatch has dedicated sources reached through their official APIs (Hacker News, Discourse, GitHub, Stack Exchange) or through the waterfall (web, news). The difference is coverage of comments, forums, and developer sources that Google indexes late or not at all.
For an agent
Google Alerts has no agent surface. No API, no webhooks, no MCP, no llms.txt. The only programmatic access is parsing email or polling RSS. discatch’s REST API and trial keys work today. Catches push to a webhook, a command, or a todo.
The Reddit gap
You can set up a Google Alert for site:reddit.com and your brand name. It will catch some post titles that Google indexes. It will miss most comments, and delivery lags by hours or days. Two editorial pages exist for this query: one by RedShip (2026-03-14) and one by ChatterSift (2026-05-17). Both reach the same conclusion: Google Alerts does not work for Reddit monitoring.
discatch reaches Reddit through the web index today, which covers what web crawlers can see. A direct Reddit source is reserved until a cleared path exists. Free Reddit alerts are planned.