Get the parent classes of a class
AI agents call get_parent_classes_by_class_full_name to retrieve information from Joern MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves structural information about code (parent class relationships) without modifying any data, executing code, or triggering external operations. It is a simple query operation analogous to inspecting metadata. No side effects or irreversible actions are possible.
From the tool's definition Tool name 'get_parent_classes_by_class_full_name' and description 'Get the parent classes of a class' indicate data retrieval with no modification or side effects.
Documented attack patterns abuse exactly the kind of access get_parent_classes_by_class_full_name gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Joern MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get_parent_classes_by_class_full_name:
{
"version": "1",
"default": "deny",
"tools": {
"get_parent_classes_by_class_full_name": {}
}
}get_parent_classes_by_class_full_name is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Get the parent classes of a class. It is categorised as a Read tool in the Joern MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Joern MCP Server MCP server in PolicyLayer and add a rule for get_parent_classes_by_class_full_name: 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 Joern MCP Server. Nothing to install.
get_parent_classes_by_class_full_name 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_parent_classes_by_class_full_name 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_parent_classes_by_class_full_name. 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_parent_classes_by_class_full_name is provided by the Joern MCP Server MCP server (sfncat/mcp-joern). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 21 Joern MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
21 Joern MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.