crow_miniflux_add_feed

THE RISK

Medium Risk

Why crow_miniflux_add_feed needs a policy

This tool creates a new data record (RSS/Atom feed subscription) in the system, making it a Write operation. The severity is medium because while subscription creation is reversible, subscribing to malicious or unwanted feeds could lead to resource consumption, information injection, or phishing attempts through feed content, but the blast radius is limited to the feed subscription system itself and does not…

From the tool's definition The tool description explicitly states it will "Subscribe to a new RSS/Atom feed" which creates a new entry in the feed subscription system.

Documented attack patterns abuse exactly the kind of access crow_miniflux_add_feed gives an agent:

POLICY

How to control crow_miniflux_add_feed

PolicyLayer is an MCP gateway — it sits between your AI agents and Crow, and nothing reaches the server without passing your rules. This is the rule we recommend for crow_miniflux_add_feed:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "crow_miniflux_add_feed": {
      "limits": [
        {
          "counter": "crow_miniflux_add_feed_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

crow_miniflux_add_feed stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

Create a free account and register Crow — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about crow_miniflux_add_feed

What does the crow_miniflux_add_feed tool do? +

Subscribe to a new RSS/Atom feed by URL. It is categorised as a Write tool in the Crow MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on crow_miniflux_add_feed? +

Register the Crow MCP server in PolicyLayer and add a rule for crow_miniflux_add_feed: 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 Crow. Nothing to install.

What risk level is crow_miniflux_add_feed? +

crow_miniflux_add_feed is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit crow_miniflux_add_feed? +

Yes. Add a rate_limit block to the crow_miniflux_add_feed 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.

How do I block crow_miniflux_add_feed completely? +

Set action: deny in the PolicyLayer policy for crow_miniflux_add_feed. 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.

What MCP server provides crow_miniflux_add_feed? +

crow_miniflux_add_feed is provided by the Crow MCP server (kh0pper/crow). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Crow tool call.

Start from Crow, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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