Return one sub-national area: score, rank, indicator breakdown and fix. Given a region code (an EU NUTS-2 code or a Dutch municipality CBS GM-code), returns that area's composite score, its rank within its own level (regions rank against regions, municipalities against municipalities), the per-in...
Part of the The Cracks Index server.
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AI agents call region_detail to retrieve information from The Cracks Index 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 region_detail 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": {
"region_detail": {}
}
}See the full The Cracks Index policy for all 15 tools.
These attack patterns abuse exactly the kind of access region_detail 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.
Return one sub-national area: score, rank, indicator breakdown and fix. Given a region code (an EU NUTS-2 code or a Dutch municipality CBS GM-code), returns that area's composite score, its rank within its own level (regions rank against regions, municipalities against municipalities), the per-indicator breakdown and the single highest-impact improvement for the area. Read-only, no personal data.. It is categorised as a Read tool in the The Cracks Index MCP Server, which means it retrieves data without modifying state.
Register the The Cracks Index MCP server in PolicyLayer and add a rule for region_detail: 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 The Cracks Index. Nothing to install.
region_detail 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 region_detail 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 region_detail. 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.
region_detail is provided by the The Cracks Index MCP server (https://api.fynqo.app/mcp/cracks/). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 15 The Cracks Index tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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