gns3_get_idle_pc_values

WHAT IT DOES

What gns3_get_idle_pc_values does on GNS3 Network Simulator MCP Server

AI agents call gns3_get_idle_pc_values to retrieve information from GNS3 Network Simulator MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

THE RISK

Low Risk

Why gns3_get_idle_pc_values needs a policy

This tool retrieves idle-pc configuration values from Dynamips routers for optimization purposes. It performs data retrieval without modifying, deleting, or executing any operations. There is no possibility of data loss, financial impact, or execution of arbitrary code. The tool only queries existing idle-pc values to help reduce CPU usage, making it a straightforward Read category tool with low severity.

From the tool's definition Tool name 'gns3_get_idle_pc_values' and description 'Get idle-pc values for Dynamips routers to reduce CPU usage' indicate a retrieval/query operation with no side effects. The word 'Get' explicitly signals a read-only action.

Documented attack patterns abuse exactly the kind of access gns3_get_idle_pc_values gives an agent:

POLICY

How to control gns3_get_idle_pc_values

PolicyLayer is an MCP gateway — it sits between your AI agents and GNS3 Network Simulator MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for gns3_get_idle_pc_values:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "gns3_get_idle_pc_values": {}
  }
}

gns3_get_idle_pc_values is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register GNS3 Network Simulator MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

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EXPLORE

Related tools and policies

More GNS3 Network Simulator MCP Server tools

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about gns3_get_idle_pc_values

What does the gns3_get_idle_pc_values tool do? +

Get idle-pc values for Dynamips routers to reduce CPU usage. It is categorised as a Read tool in the GNS3 Network Simulator MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on gns3_get_idle_pc_values? +

Register the GNS3 Network Simulator MCP Server MCP server in PolicyLayer and add a rule for gns3_get_idle_pc_values: 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 GNS3 Network Simulator MCP Server. Nothing to install.

What risk level is gns3_get_idle_pc_values? +

gns3_get_idle_pc_values is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit gns3_get_idle_pc_values? +

Yes. Add a rate_limit block to the gns3_get_idle_pc_values 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.

How do I block gns3_get_idle_pc_values completely? +

Set action: deny in the PolicyLayer policy for gns3_get_idle_pc_values. 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.

What MCP server provides gns3_get_idle_pc_values? +

gns3_get_idle_pc_values is provided by the GNS3 Network Simulator MCP Server MCP server (wael-rd/gns3-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every GNS3 Network Simulator MCP Server tool call.

Start from GNS3 Network Simulator MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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42 GNS3 Network Simulator MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.