Explore the inheritance and interface implementation tree for a class or interface. Returns ancestors (parent classes / implemented interfaces) and descendants (subclasses / implementors). Use before modifying a base class to understand the full blast radius across the hierarchy.
AI agents call get_hierarchy to retrieve information from GraphHub without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
get_hierarchy retrieves and displays structural information about class inheritance relationships. It performs no write, delete, or code execution operations. While the description mentions use-cases for understanding blast radius before modifications, the tool itself only reads and presents existing hierarchy data. This is a straightforward semantic search/exploration capability with no side effects.
From the tool's definition Tool description states 'Explore the inheritance and interface implementation tree' and 'Returns ancestors...and descendants'. The verb 'explore' and 'returns' indicate querying/retrieval operations with no modification of data.
Documented attack patterns abuse exactly the kind of access get_hierarchy gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and GraphHub, and nothing reaches the server without passing your rules. This is the rule we recommend for get_hierarchy:
{
"version": "1",
"default": "deny",
"tools": {
"get_hierarchy": {}
}
}get_hierarchy is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Explore the inheritance and interface implementation tree for a class or interface. Returns ancestors (parent classes / implemented interfaces) and descendants (subclasses / implementors). Use before modifying a base class to understand the full blast radius across the hierarchy. It is categorised as a Read tool in the GraphHub MCP Server, which means it retrieves data without modifying state.
Register the GraphHub MCP server in PolicyLayer and add a rule for get_hierarchy: 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 GraphHub. Nothing to install.
get_hierarchy 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 get_hierarchy 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 get_hierarchy. 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.
get_hierarchy is provided by the GraphHub MCP server (slnquangtran/graph-hub). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from GraphHub, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
32 GraphHub tools catalogued and risk-classified — across an index of 43,000+ MCP servers.