AI agents call find_shortest_paths_to_tier_zero to retrieve information from BloodHound MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries BloodHound's Active Directory attack graph to identify paths to privileged Tier 0 accounts. It retrieves information without modifying data. Severity is high because revealing attack paths to critical infrastructure could enable privilege escalation attacks, but it remains a Read operation.
From the tool's definition Tool name 'find_shortest_paths_to_tier_zero' indicates querying/searching BloodHound graph data for attack paths. Sibling tools like 'find_all_domain_admins' and 'find_asreproast_users' are clearly read-only queries. Description is empty, limiting specificity.
Documented attack patterns abuse exactly the kind of access find_shortest_paths_to_tier_zero gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and BloodHound MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for find_shortest_paths_to_tier_zero:
{
"version": "1",
"default": "deny",
"tools": {
"find_shortest_paths_to_tier_zero": {}
}
}find_shortest_paths_to_tier_zero is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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find_shortest_paths_to_tier_zero. It is categorised as a Read tool in the BloodHound MCP MCP Server, which means it retrieves data without modifying state.
Register the BloodHound MCP server in PolicyLayer and add a rule for find_shortest_paths_to_tier_zero: 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 BloodHound MCP. Nothing to install.
find_shortest_paths_to_tier_zero 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_shortest_paths_to_tier_zero 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_shortest_paths_to_tier_zero. 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_shortest_paths_to_tier_zero is provided by the BloodHound MCP server (mordavid/bloodhound-mcp-ai). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from BloodHound MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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75 BloodHound MCP tools catalogued and risk-classified — across an index of 43,000+ MCP servers.