Search AMeDAS stations within a radius from given coordinates.
AI agents call search_nearby_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 queries and returns information about weather stations based on geographic parameters. It has no side effects—it does not create, modify, delete, or execute any actions. It is purely informational retrieval, fitting the 'Read' category. Severity is low because misuse would only result in accessing publicly available weather station metadata with no operational or security impact.
From the tool's definition Tool name 'search_nearby_stations' and description 'Search AMeDAS stations within a radius from given coordinates' indicate a query operation that retrieves station data without modification.
Attacks that exploit this kind of access
Search AMeDAS stations within a radius from given coordinates. 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 search_nearby_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.
search_nearby_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 search_nearby_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 search_nearby_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.
search_nearby_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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