AI agents call news_check to retrieve information from Open Proxy without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Based on context, this tool likely retrieves or checks news/disclosure data related to Korean stocks and governance. No description provided limits confidence, but the tool name 'check' (passive verification), server purpose (providing data access), and sibling tools (all read-oriented data providers) suggest it performs queries or retrieval without creating, modifying, or deleting data.
From the tool's definition Tool named 'news_check' on a server focused on providing 'easy access to agm & governance related disclosures' for Korean stocks. The naming convention matches sibling tools (agm_*, news_*) that appear to retrieve/query financial disclosure data.
Documented attack patterns abuse exactly the kind of access news_check gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Open Proxy, and nothing reaches the server without passing your rules. This is the rule we recommend for news_check:
{
"version": "1",
"default": "deny",
"tools": {
"news_check": {}
}
}news_check is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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news_check. It is categorised as a Read tool in the Open Proxy MCP Server, which means it retrieves data without modifying state.
Register the Open Proxy MCP server in PolicyLayer and add a rule for news_check: 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 Open Proxy. Nothing to install.
news_check 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 news_check 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 news_check. 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.
news_check is provided by the Open Proxy MCP server (marcoyou/open-proxy-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Open Proxy, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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54 Open Proxy tools catalogued and risk-classified — across an index of 43,000+ MCP servers.