Subscribe to an RSSHub feed. Add a route to your subscription list for easy access later.
AI agents use subscribe to create or update resources in RSSHub MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your RSSHub MCP Server environment.
The tool modifies user data by adding a feed subscription to a list. This is a non-destructive write operation: subscriptions can be removed later (as evidenced by the sibling 'unsubscribe' tool). There are no financial obligations, data deletion, code execution, or irreversible consequences. The blast radius is minimal — at worst, a user accumulates unwanted feed subscriptions, which is easily remedied.
From the tool's definition Tool description states 'Subscribe to an RSSHub feed. Add a route to your subscription list' — this creates a new subscription record, which is a reversible write operation.
Documented attack patterns abuse exactly the kind of access subscribe gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and RSSHub MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for subscribe:
{
"version": "1",
"default": "deny",
"tools": {
"subscribe": {
"limits": [
{
"counter": "subscribe_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}subscribe 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.
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Subscribe to an RSSHub feed. Add a route to your subscription list for easy access later. It is categorised as a Write tool in the RSSHub MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the RSSHub MCP Server MCP server in PolicyLayer and add a rule for subscribe: 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 RSSHub MCP Server. Nothing to install.
subscribe is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the subscribe 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 subscribe. 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.
subscribe is provided by the RSSHub MCP Server MCP server (panxiande/rsshub-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from RSSHub MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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5 RSSHub MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.