AI agents call list_call_stack to retrieve information from Node Js Debugger MCP without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool retrieves the current call stack during debugging—a non-destructive, non-executable query operation. It provides visibility into program execution state without modifying code, state, or triggering side effects. No execution, data modification, or resource consumption occurs beyond inspection.
From the tool's definition Tool name 'list_call_stack' from a debugging server context; sibling tools like 'get_pause_info', 'inspect_scopes', 'get_script_source', and 'get_object_properties' are all information-retrieval operations.
Documented attack patterns abuse exactly the kind of access list_call_stack gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Node Js Debugger MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for list_call_stack:
{
"version": "1",
"default": "deny",
"tools": {
"list_call_stack": {}
}
}list_call_stack is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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list_call_stack. It is categorised as a Read tool in the Node Js Debugger MCP MCP Server, which means it retrieves data without modifying state.
Register the Node Js Debugger MCP server in PolicyLayer and add a rule for list_call_stack: 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 Node Js Debugger MCP. Nothing to install.
list_call_stack 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 list_call_stack 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 list_call_stack. 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.
list_call_stack is provided by the Node Js Debugger MCP server (scriptedalchemy/devtools-debugger-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 21 Node Js Debugger MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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21 Node Js Debugger MCP tools catalogued and risk-classified — across an index of 42,500+ MCP servers.