get-catalog-nodes

THE RISK

Low Risk

Why get-catalog-nodes needs a policy

This tool queries and retrieves node information from Consul's catalog. The verb 'Get' and the retrieval-only nature of catalog queries classify this as a Read operation. Exposure of node information has minimal security impact compared to other Consul operations (write, delete, execute) available on this server.

From the tool's definition Tool name 'get-catalog-nodes' and description 'Get nodes from the catalog' indicate a retrieval operation with no modification or side effects.

Documented attack patterns abuse exactly the kind of access get-catalog-nodes gives an agent:

POLICY

How to control get-catalog-nodes

PolicyLayer is an MCP gateway — it sits between your AI agents and Consul MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for get-catalog-nodes:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "get-catalog-nodes": {}
  }
}

get-catalog-nodes 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 Consul 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.

CAP THIS TOOL →

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EXPLORE

Related tools and policies

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All 25 Consul MCP Server tools →

Read 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.
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-catalog-nodes

What does the get-catalog-nodes tool do? +

Get nodes from the catalog. It is categorised as a Read tool in the Consul MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get-catalog-nodes? +

Register the Consul MCP Server MCP server in PolicyLayer and add a rule for get-catalog-nodes: 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 Consul MCP Server. Nothing to install.

What risk level is get-catalog-nodes? +

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

Can I rate-limit get-catalog-nodes? +

Yes. Add a rate_limit block to the get-catalog-nodes 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-catalog-nodes completely? +

Set action: deny in the PolicyLayer policy for get-catalog-nodes. 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-catalog-nodes? +

get-catalog-nodes is provided by the Consul MCP Server MCP server (kocierik/consul-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 Consul MCP Server tool call.

Start from Consul 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 →