get_global_topology

THE RISK

Low Risk

Why get_global_topology needs a policy

This is a read-only operation that retrieves and queries data about projects and their topology. The tool returns information (project lists, statistics, subgraph details) without creating, modifying, deleting, or executing operations.

From the tool's definition Tool performs 'project list + stats' retrieval and 'detailed subgraph' queries with optional projectId parameter. No modification, deletion, or execution described.

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

POLICY

How to control get_global_topology

PolicyLayer is an MCP gateway — it sits between your AI agents and N2n Nexus, and nothing reaches the server without passing your rules. This is the rule we recommend for get_global_topology:

policy.json

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

get_global_topology 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 N2n Nexus — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

More N2n Nexus tools

Destructive cancel_task Cancel pending/running task. Destructive host_delete_project [ASYNC][Host] Delete project. Irreversible. Returns taskId. Destructive host_maintenance [Host] Manage logs: Execute start_meeting Start new meeting session. Returns meeting ID. Write archive_meeting [Host] Archive closed meeting. Read-only after. Write create_task [ASYNC] Create background task. Returns taskId for polling. Write end_meeting [Host] End active meeting. Locks history. Write register_session_context Declare active project. Format: [prefix]_[name] (e.g.,

All 22 N2n Nexus 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 get_global_topology

What does the get_global_topology tool do? +

Default: project list + stats. With projectId: detailed subgraph. It is categorised as a Read tool in the N2n Nexus MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_global_topology? +

Register the N2n Nexus MCP server in PolicyLayer and add a rule for get_global_topology: 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 N2n Nexus. Nothing to install.

What risk level is get_global_topology? +

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

Can I rate-limit get_global_topology? +

Yes. Add a rate_limit block to the get_global_topology 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 get_global_topology completely? +

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

get_global_topology is provided by the N2n Nexus MCP server (n2ns/n2n-nexus). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every N2n Nexus tool call.

Start from N2n Nexus, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →