Retrieves the fully name of a class by its ID
AI agents call get_class_full_name_by_id 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 performs a simple lookup/retrieval operation on code metadata. It returns information about a class name given an identifier, with no side effects, no code execution, and no data modification. It fits the 'Read' category as it queries data without side effects.
From the tool's definition Tool name 'get_class_full_name_by_id' and description 'Retrieves the fully name of a class by its ID' indicate a read-only query operation that fetches metadata about code structure without modifying or executing anything.
Documented attack patterns abuse exactly the kind of access get_class_full_name_by_id 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_class_full_name_by_id:
{
"version": "1",
"default": "deny",
"tools": {
"get_class_full_name_by_id": {}
}
}get_class_full_name_by_id is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Retrieves the fully name of a class by its ID. 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_class_full_name_by_id: 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_class_full_name_by_id 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_class_full_name_by_id 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_class_full_name_by_id. 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_class_full_name_by_id 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.