Update node settings and properties.
AI agents use gns3_update_node 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.
This tool modifies node configuration reversibly within a network simulation. While changes to node properties could affect simulation behavior, they are not destructive (data can be reverted), not financial, and not code execution—they represent standard configuration updates. The blast radius is contained to the simulation context and changes are reversible, justifying Write category with medium severity.
From the tool's definition Tool name 'gns3_update_node' and description 'Update node settings and properties' indicate modification of existing configuration data within a GNS3 simulation.
Documented attack patterns abuse exactly the kind of access gns3_update_node gives an agent:
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_update_node:
{
"version": "1",
"default": "deny",
"tools": {
"gns3_update_node": {
"limits": [
{
"counter": "gns3_update_node_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}gns3_update_node 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.
Free to start. No card required.
Update node settings and properties. 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.
Register the GNS3 Network Simulator MCP Server MCP server in PolicyLayer and add a rule for gns3_update_node: 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.
gns3_update_node is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the gns3_update_node 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 gns3_update_node. 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.
gns3_update_node 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.
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.
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.