Loads a memory heapsnapshot and returns instances of a specific class with their stable IDs.
AI agents call get_nodes_by_class to retrieve information from Opera DevTools MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs memory inspection and data retrieval only. It queries heap snapshot data to find class instances and their IDs, which is purely informational. No data is modified, deleted, or code executed. The operation has no side effects beyond returning diagnostic information, making it a Read operation with low severity—even if misused, an AI agent could only extract memory information, not cause damage.
From the tool's definition Tool 'loads a memory heapsnapshot and returns instances' — retrieves data from heap memory without modification. The verb 'returns' indicates a query/retrieval operation with no side effects.
Attacks that exploit this kind of access
Loads a memory heapsnapshot and returns instances of a specific class with their stable IDs. It is categorised as a Read tool in the Opera DevTools MCP MCP Server, which means it retrieves data without modifying state.
Register the Opera DevTools MCP server in PolicyLayer and add a rule for get_nodes_by_class: 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 Opera DevTools MCP. Nothing to install.
get_nodes_by_class 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_nodes_by_class 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_nodes_by_class. 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_nodes_by_class is provided by the Opera DevTools MCP server (operasoftware/opera-devtools-mcp). 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.
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