利用可能シンボル一覧。group はワイルドカードフィルタ（例 "*USD*"）。
AI agents call mt5_symbols_list to retrieve information from MT5 MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a query/list operation that retrieves market symbol data without side effects. It enables discovery of available instruments on MetaTrader 5 but does not create, modify, delete, or execute any trading actions. The wildcard filtering capability is purely for search refinement, not for data manipulation.
From the tool's definition Tool name 'mt5_symbols_list' and description indicate it retrieves/lists available trading symbols with wildcard filtering. The description states '利用可能シンボル一覧' (list of available symbols) with group parameter supporting wildcard filters like '*USD*'.
Attacks that exploit this kind of access
利用可能シンボル一覧。group はワイルドカードフィルタ（例 "*USD*"）。. It is categorised as a Read tool in the MT5 MCP Server MCP Server, which means it retrieves data without modifying state.
Register the MT5 MCP Server MCP server in PolicyLayer and add a rule for mt5_symbols_list: 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 MT5 MCP Server. Nothing to install.
mt5_symbols_list 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 mt5_symbols_list 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 mt5_symbols_list. 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.
mt5_symbols_list is provided by the MT5 MCP Server MCP server (junmt/mt5-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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