AI agents call listKeywords to retrieve information from MCP-RSS-Crawler without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves stored keyword data without side effects. It does not create, modify, delete, or execute any operations. The blast radius of misuse is minimal—an agent could only learn what keywords exist in the system, posing no risk to data integrity or external systems.
From the tool's definition Tool name 'listKeywords' and description 'Get a list of all user interest keywords' indicate a retrieval operation with no modification, deletion, or execution of external processes. The verb 'Get' and 'list' are characteristic of Read operations.
Risk signalsBulk/mass operation — affects multiple targets
Documented attack patterns abuse exactly the kind of access listKeywords gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and MCP-RSS-Crawler, and nothing reaches the server without passing your rules. This is the rule we recommend for listKeywords:
{
"version": "1",
"default": "deny",
"tools": {
"listKeywords": {}
}
}listKeywords is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get a list of all user interest keywords. It is categorised as a Read tool in the MCP-RSS-Crawler MCP Server, which means it retrieves data without modifying state.
Register the MCP-RSS-Crawler MCP server in PolicyLayer and add a rule for listKeywords: 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-Crawler. Nothing to install.
listKeywords 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 listKeywords 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 listKeywords. 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.
listKeywords is provided by the MCP-RSS-Crawler MCP server (mshk/mcp-rss-crawler). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from MCP-RSS-Crawler, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
18 MCP-RSS-Crawler tools catalogued and risk-classified — across an index of 43,000+ MCP servers.