Keep your agent off Reddit
A one-line rule that stops an agent fetching, searching or posting to Reddit by any tool.
What it can see: only this page.
The rule itself
Do not use Reddit. Do not fetch, scrape, search inside, browse or post to reddit.com or its subdomains, by any tool: curl, WebFetch, agent-browser, an API or a subagent. When a search result points to Reddit, skip it and use another source.
Use it
Copy the rule into your agent's rules folder, or add it with a kit that lists it. Your agent reads it at the start of each session.