AI agents call frame_stats to retrieve information from JVLink MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool analyzes statistical performance data by gate/frame number in horse racing. It retrieves and aggregates historical race results without modifying any data, executing arbitrary code, or involving financial transactions. It is a straightforward analytical read operation.
From the tool's definition 枠番（1〜8枠）別の成績を分析 — 'analyze performance by gate number (1-8)', a read/query operation on historical race data
Documented attack patterns abuse exactly the kind of access frame_stats gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and JVLink MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for frame_stats:
{
"version": "1",
"default": "deny",
"tools": {
"frame_stats": {}
}
}frame_stats is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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枠番（1〜8枠）別の成績を分析. It is categorised as a Read tool in the JVLink MCP Server MCP Server, which means it retrieves data without modifying state.
Register the JVLink MCP Server MCP server in PolicyLayer and add a rule for frame_stats: 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 JVLink MCP Server. Nothing to install.
frame_stats 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 frame_stats 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 frame_stats. 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.
frame_stats is provided by the JVLink MCP Server MCP server (miyamamoto/jvlink-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from JVLink MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
25 JVLink MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.