指定年の年間サマリー
AI agents call get_yearly_summary 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 tool queries and returns historical market data with no side effects. It follows the Read category pattern: retrieves information without creating, modifying, deleting, or executing operations.
From the tool's definition Tool retrieves yearly summary data for a specified year from historical market index data. Description indicates it 'gets' or 'retrieves' information ('年間サマリー' = yearly summary). No modification, deletion, or execution capabilities indicated.
Attacks that exploit this kind of access
指定年の年間サマリー. 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 get_yearly_summary: 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.
get_yearly_summary 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 get_yearly_summary 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 get_yearly_summary. 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.
get_yearly_summary 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.
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