Check for new items in a feed since a specific time or last check
AI agents call monitor_feed_updates to retrieve information from Mcp Rss without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves or queries feed data to detect new items. It performs no modification, deletion, or execution of external operations. While it monitors for updates, the monitoring itself is a read-only check that produces no side effects on the feed or any external system.
From the tool's definition Tool description states 'Check for new items in a feed since a specific time or last check' — a retrieval operation with no side effects. The server explicitly provides RSS feed fetching and monitoring capabilities focused on reading and parsing feeds.
Documented attack patterns abuse exactly the kind of access monitor_feed_updates gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Rss, and nothing reaches the server without passing your rules. This is the rule we recommend for monitor_feed_updates:
{
"version": "1",
"default": "deny",
"tools": {
"monitor_feed_updates": {}
}
}monitor_feed_updates is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Check for new items in a feed since a specific time or last check. It is categorised as a Read tool in the Mcp Rss MCP Server, which means it retrieves data without modifying state.
Register the Mcp Rss MCP server in PolicyLayer and add a rule for monitor_feed_updates: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Mcp Rss. Nothing to install.
monitor_feed_updates is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the monitor_feed_updates rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for monitor_feed_updates. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
monitor_feed_updates is provided by the Mcp Rss MCP server (missionsquad/mcp-rss). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Mcp Rss, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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6 Mcp Rss tools catalogued and risk-classified — across an index of 43,000+ MCP servers.