List all 218 countries with metadata (region, income level, capital).
Part of the Statistics of the World server.
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AI agents call get_country_list to retrieve information from Statistics of the World without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though get_country_list only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"get_country_list": {}
}
}See the full Statistics of the World policy for all 7 tools.
These attack patterns abuse exactly the kind of access get_country_list gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
List all 218 countries with metadata (region, income level, capital).. It is categorised as a Read tool in the Statistics of the World MCP Server, which means it retrieves data without modifying state.
Register the Statistics of the World MCP server in PolicyLayer and add a rule for get_country_list: 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 Statistics of the World. Nothing to install.
get_country_list 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_country_list 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_country_list. 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_country_list is provided by the Statistics of the World MCP server (https://statisticsoftheworld.com/api/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 7 Statistics of the World tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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