gns3_delete_link

THE RISK

Critical Risk

Why gns3_delete_link needs a policy

Deleting a link between nodes in a GNS3 simulation is a destructive action that cannot be automatically undone—it permanently removes the connection configuration. While the impact is scoped to a simulation project, the irreversible nature of deletion and the potential to break network topology designs makes this Destructive rather than Write.

From the tool's definition Tool name 'gns3_delete_link' with description 'Delete a link between nodes.' uses the verb 'Delete' which indicates irreversible removal of a network topology element.

Documented attack patterns abuse exactly the kind of access gns3_delete_link gives an agent:

POLICY

How to control gns3_delete_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_delete_link:

policy.json

{
  "version": "1",
  "default": "deny",
  "hide": [
    "gns3_delete_link"
  ]
}

gns3_delete_link disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.

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.

RESTRICT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More GNS3 Network Simulator MCP Server tools

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. Execute gns3_start_node Start a specific node.

All 42 GNS3 Network Simulator MCP Server tools →

Destructive tools on other servers

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Go deeper

Critical-risk tools in GNS3 Network Simulator MCP Server → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Blast radius → How much damage one compromised or confused agent can do — and how to bound it.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about gns3_delete_link

What does the gns3_delete_link tool do? +

Delete a link between nodes. It is categorised as a Destructive tool in the GNS3 Network Simulator MCP Server MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.

How do I enforce a policy on gns3_delete_link? +

Register the GNS3 Network Simulator MCP Server MCP server in PolicyLayer and add a rule for gns3_delete_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_delete_link? +

gns3_delete_link is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit gns3_delete_link? +

Yes. Add a rate_limit block to the gns3_delete_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_delete_link completely? +

Set action: deny in the PolicyLayer policy for gns3_delete_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_delete_link? +

gns3_delete_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 →