利用可能な銘柄一覧を取得
AI agents call list_symbols to retrieve information from Market Index MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is a pure query/list operation that retrieves metadata about available symbols without modifying data, executing commands, or creating side effects. It poses minimal risk—an AI agent misusing it can only waste API quota or learn which symbols exist, neither of which causes harm.
From the tool's definition Tool name 'list_symbols' and description 'get list of available symbols' indicate a retrieval operation with no modification or execution. The server provides read-only access to historical market data; this tool simply enumerates available index symbols.
Attacks that exploit this kind of access
利用可能な銘柄一覧を取得. It is categorised as a Read tool in the Market Index MCP MCP Server, which means it retrieves data without modifying state.
Register the Market Index MCP server in PolicyLayer and add a rule for list_symbols: 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 Market Index MCP. Nothing to install.
list_symbols 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 list_symbols 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 list_symbols. 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.
list_symbols is provided by the Market Index MCP server (tamappe/market-index-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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