List all AMeDAS stations (1286 stations) with pagination.
AI agents call list_stations to retrieve information from JMA Data MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and enumerates public weather station information with pagination support. It performs no data modification, deletion, code execution, or financial operations. The operation has no side effects and is purely informational. Public meteorological data exposure presents minimal security risk.
From the tool's definition Tool name 'list_stations' and description 'List all AMeDAS stations (1286 stations) with pagination' indicate a retrieval operation that queries meteorological station metadata without modifying data.
Attacks that exploit this kind of access
List all AMeDAS stations (1286 stations) with pagination. It is categorised as a Read tool in the JMA Data MCP MCP Server, which means it retrieves data without modifying state.
Register the JMA Data MCP server in PolicyLayer and add a rule for list_stations: 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 JMA Data MCP. Nothing to install.
list_stations 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_stations 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_stations. 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_stations is provided by the JMA Data MCP server (koizumikento/jma-data-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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