AI agents call bcn_cercar_datasets to retrieve information from Mcp Govern without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool appears to search Barcelona government datasets without modifying them. While the description is empty, the naming convention and sibling tools strongly suggest query/search functionality over publicly available government transparency data. Classified as Read rather than other categories because it retrieves rather than executes, writes, deletes, or moves money.
From the tool's definition Tool name 'bcn_cercar_datasets' suggests searching/querying datasets from Barcelona government sources. Sibling tools like 'bcn_detall_dataset' and 'bcn_obtenir_dades' (obtain data) indicate this server retrieves government transparency data.
Documented attack patterns abuse exactly the kind of access bcn_cercar_datasets gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Govern, and nothing reaches the server without passing your rules. This is the rule we recommend for bcn_cercar_datasets:
{
"version": "1",
"default": "deny",
"tools": {
"bcn_cercar_datasets": {}
}
}bcn_cercar_datasets is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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bcn_cercar_datasets. It is categorised as a Read tool in the Mcp Govern MCP Server, which means it retrieves data without modifying state.
Register the Mcp Govern MCP server in PolicyLayer and add a rule for bcn_cercar_datasets: 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 Mcp Govern. Nothing to install.
bcn_cercar_datasets 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 bcn_cercar_datasets 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 bcn_cercar_datasets. 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.
bcn_cercar_datasets is provided by the Mcp Govern MCP server (xavimf87/mcp-govern). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Mcp Govern, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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49 Mcp Govern tools catalogued and risk-classified — across an index of 43,000+ MCP servers.