get_weather_time_series
AI agents call get_weather_time_series 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 weather data over a time period from the JMA database. No side effects, modifications, deletions, code execution, or financial operations are implied. It is a straightforward data query operation with minimal risk even if misused by an AI agent—worst case would be excessive requests or data extraction, which is read-only.
From the tool's definition Tool name 'get_weather_time_series' indicates data retrieval. Empty description limits certainty, but context shows all sibling tools (get_current_weather, get_forecast, get_historical_weather, get_station_info, list_*, search_*) are read-only queries against…
Attacks that exploit this kind of access
get_weather_time_series. 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 get_weather_time_series: 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.
get_weather_time_series 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_weather_time_series 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_weather_time_series. 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_weather_time_series 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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