Compare specific CDC PLACES measures across multiple counties. Returns a side-by-side comparison of selected health measures for the given counties. Useful for benchmarking one county against peers. Args: fips_list: List of 5-digit county FIPS codes (e.g. ['53033', '53053', '06037']). Maximum 10 ...
Part of the CDC PLACES Health Data server.
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AI agents call compare_counties to retrieve information from CDC PLACES Health Data 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 compare_counties 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": {
"compare_counties": {}
}
}See the full CDC PLACES Health Data policy for all 5 tools.
These attack patterns abuse exactly the kind of access compare_counties 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.
Compare specific CDC PLACES measures across multiple counties. Returns a side-by-side comparison of selected health measures for the given counties. Useful for benchmarking one county against peers. Args: fips_list: List of 5-digit county FIPS codes (e.g. ['53033', '53053', '06037']). Maximum 10 counties per request. measures: List of PLACES measure IDs to compare (e.g. ['DIABETES', 'OBESITY']). Maximum 10 measures per request.. It is categorised as a Read tool in the CDC PLACES Health Data MCP Server, which means it retrieves data without modifying state.
Register the CDC PLACES Health Data MCP server in PolicyLayer and add a rule for compare_counties: 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 CDC PLACES Health Data. Nothing to install.
compare_counties 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 compare_counties 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 compare_counties. 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.
compare_counties is provided by the CDC PLACES Health Data MCP server (https://mcp.olyport.com/cdc-places/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 5 CDC PLACES Health Data tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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