AI agents call ownership_major 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.
The tool name and server purpose indicate this retrieves governance/ownership disclosure data for investors. The absence of description lowers confidence slightly, but the pattern of sibling tools all being read-only data accessors strongly suggests this is a Read operation with no side effects. No evidence of modification, deletion, code execution, or financial transactions.
From the tool's definition Tool name 'ownership_major' suggests retrieving major ownership information. No description provided, but given the server context (investor/stewardship data for Korean stocks) and sibling tools that are all read-only data retrieval functions (agm_agenda_xml,…
Documented attack patterns abuse exactly the kind of access ownership_major 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 ownership_major:
{
"version": "1",
"default": "deny",
"tools": {
"ownership_major": {}
}
}ownership_major is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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ownership_major. 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 ownership_major: 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.
ownership_major 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 ownership_major 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 ownership_major. 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.
ownership_major 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.