java_class_histogram
AI agents call java_class_histogram to retrieve information from Heap Seance without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Class histograms are read-only diagnostic queries into running Java process memory. They retrieve and report data about heap object distribution without modifying, executing code, or deleting anything. The empty description lowers confidence slightly, but the server context and tool name strongly indicate a passive introspection capability typical of JVM diagnostic tools like jmap -histo.
From the tool's definition Tool name 'java_class_histogram' combined with server context describing 'Class histograms' as part of memory leak investigation tooling. Class histograms are diagnostic snapshots that report object counts and memory usage by class type.
Attacks that exploit this kind of access
java_class_histogram. It is categorised as a Read tool in the Heap Seance MCP Server, which means it retrieves data without modifying state.
Register the Heap Seance MCP server in PolicyLayer and add a rule for java_class_histogram: 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 Heap Seance. Nothing to install.
java_class_histogram 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 java_class_histogram 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 java_class_histogram. 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.
java_class_histogram is provided by the Heap Seance MCP server (segfaultsorcerer/heap-seance). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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