get_post_comments

THE RISK

Low Risk

Why get_post_comments needs a policy

This tool retrieves publicly available data (Reddit post comments) through RSS feeds without authentication. It performs a query operation that returns information without modifying any state, creating dependencies, or performing destructive actions.

From the tool's definition The tool 'reads user comments on a Reddit post via RSS' — the primary verb is 'read', indicating data retrieval with no side effects.

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

POLICY

How to control get_post_comments

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_post_comments": {}
  }
}

get_post_comments is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

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

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More Reddit Rss tools

Read browse_subreddit Fetch posts from a subreddit via RSS (no API key). Returns title, author, link, date, exce Read search_reddit Search Reddit posts via RSS (no API key). Optionally restrict to one subreddit.

All 3 Reddit Rss tools →

Read tools on other servers

M-Team MCP Server get_torrent_detail YouTube MCP Server search_channel Android Forensics ADB MCP Server parse_browser_history 0xarchive web3_challenge

Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about get_post_comments

What does the get_post_comments tool do? +

Read the user comments on a Reddit post via RSS (no API key). Pass the post URL/permalink. It is categorised as a Read tool in the Reddit Rss MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_post_comments? +

Register the Reddit Rss MCP server in PolicyLayer and add a rule for get_post_comments: 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 Reddit Rss. Nothing to install.

What risk level is get_post_comments? +

get_post_comments is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit get_post_comments? +

Yes. Add a rate_limit block to the get_post_comments 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 get_post_comments completely? +

Set action: deny in the PolicyLayer policy for get_post_comments. 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 get_post_comments? +

get_post_comments is provided by the Reddit Rss MCP server (ninjackster/reddit-rss-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Reddit Rss tool call.

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

CHECK YOUR STACK →