Get top posts from a subreddit
AI agents call get_top_posts to retrieve information from Reddit MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries existing Reddit posts from a subreddit without creating, modifying, deleting, or executing any operations. It has no side effects and falls squarely into the Read category. Severity is low because retrieving public Reddit posts poses minimal risk even if misused by an AI agent—at worst it could be used for data aggregation or analysis of public content.
From the tool's definition Tool name 'get_top_posts' and description 'Get top posts from a subreddit' indicate data retrieval with no modification or execution capability. The verb 'get' and the read-only nature of fetching posts from a subreddit are clear indicators.
Attacks that exploit this kind of access
Get top posts from a subreddit. It is categorised as a Read tool in the Reddit MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Reddit MCP Server MCP server in PolicyLayer and add a rule for get_top_posts: 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 MCP Server. Nothing to install.
get_top_posts 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 get_top_posts 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 get_top_posts. 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.
get_top_posts is provided by the Reddit MCP Server MCP server (samy-clivolt/reddit-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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