gns3_add_link · GNS3 Network Simulator MCP Server MCP

WHAT IT DOES

What gns3_add_link does on GNS3 Network Simulator MCP Server

AI agents use gns3_add_link to create or update resources in GNS3 Network Simulator MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your GNS3 Network Simulator MCP Server environment.

THE RISK

Medium Risk

Why gns3_add_link needs a policy

This tool performs a reversible create/modify operation on network topology data within the GNS3 simulation environment. It does not execute arbitrary commands, delete data, or cause financial impact.

From the tool's definition Tool creates a link between nodes in a network topology. The description states it will 'Create a link' which is a reversible modification operation. The action modifies the network simulation state by adding a connection between two nodes.

Documented attack patterns abuse exactly the kind of access gns3_add_link gives an agent:

POLICY

How to control gns3_add_link

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_add_link:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "gns3_add_link": {
      "limits": [
        {
          "counter": "gns3_add_link_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

gns3_add_link stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. 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.

LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More GNS3 Network Simulator MCP Server tools

Destructive gns3_delete_link Delete a link between nodes. Destructive gns3_delete_node Delete a node from the project. Destructive gns3_delete_project Permanently delete a project and all its files. Destructive gns3_delete_snapshot Delete a snapshot permanently. Destructive gns3_restore_snapshot Restore a project from a snapshot. Execute gns3_reload_node Reload a node (restart without stopping). Execute gns3_start_all_nodes Start all nodes in a project. Execute gns3_start_capture Start packet capture on a link.

All 42 GNS3 Network Simulator MCP Server tools →

Write tools on other servers

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about gns3_add_link

What does the gns3_add_link tool do? +

Create a link between two nodes. It is categorised as a Write tool in the GNS3 Network Simulator MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on gns3_add_link? +

Register the GNS3 Network Simulator MCP Server MCP server in PolicyLayer and add a rule for gns3_add_link: 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_add_link? +

gns3_add_link is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit gns3_add_link? +

Yes. Add a rate_limit block to the gns3_add_link 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_add_link completely? +

Set action: deny in the PolicyLayer policy for gns3_add_link. 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_add_link? +

gns3_add_link 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.

CHECK YOUR STACK →

Free to start. No card required.

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