Find public facilities near GPS coordinates in Seoul, sorted by distance. Args: lat: Latitude of the search center point (Seoul range: ~37.4 to ~37.7). lng: Longitude of the search center point (Seoul range: ~126.7 to ~127.2). radius_m: Search radius in meters (100-5000, default 500). type: Optio...
Part of the Seoul Essentials server.
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AI agents call find_nearby to retrieve information from Seoul Essentials 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 find_nearby 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": {
"find_nearby": {}
}
}See the full Seoul Essentials policy for all 4 tools.
These attack patterns abuse exactly the kind of access find_nearby 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.
Find public facilities near GPS coordinates in Seoul, sorted by distance. Args: lat: Latitude of the search center point (Seoul range: ~37.4 to ~37.7). lng: Longitude of the search center point (Seoul range: ~126.7 to ~127.2). radius_m: Search radius in meters (100-5000, default 500). type: Optional filter by facility type — "toilet", "pharmacy", "wifi", "aed", or "tourist_info". limit: Maximum number of results to return (1-20, default 5). Returns: A list of nearby places sorted by distance, with distance_m field indicating meters from the search point.. It is categorised as a Read tool in the Seoul Essentials MCP Server, which means it retrieves data without modifying state.
Register the Seoul Essentials MCP server in PolicyLayer and add a rule for find_nearby: 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 Seoul Essentials. Nothing to install.
find_nearby 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 find_nearby 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 find_nearby. 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.
find_nearby is provided by the Seoul Essentials MCP server (do-droid/seoul-essentials). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 4 Seoul Essentials tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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