AI agents call evidence 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.
Without a description, confidence is reduced. However, the server's stated purpose is providing 'easy access to agm & governance related disclosures,' and all sibling tools are read-only data retrieval. The name 'evidence' most likely refers to retrieving or querying evidence documents rather than creating, modifying, deleting, or executing operations.
From the tool's definition Tool name 'evidence' with empty description. Context suggests this server provides read-only access to AGM (Annual General Meeting) and governance disclosures for Korean stocks.
Documented attack patterns abuse exactly the kind of access evidence 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 evidence:
{
"version": "1",
"default": "deny",
"tools": {
"evidence": {}
}
}evidence is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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evidence. 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 evidence: 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.
evidence 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 evidence 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 evidence. 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.
evidence 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.