list_organisations

THE RISK

Low Risk

Why list_organisations needs a policy

This tool only queries and returns metadata about organisations (name, currency, country, fiscal year, tax settings, edition). No data is created, modified, deleted, or executed. The information retrieved is configuration metadata that does not grant control over financial transactions.

From the tool's definition Tool name is 'list_organisations' and description states 'Retrieve the Xero organisation(s)' — explicitly a retrieval/query operation with no modification or side effects.

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

POLICY

How to control list_organisations

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

policy.json

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

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

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EXPLORE

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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 list_organisations

What does the list_organisations tool do? +

Retrieve the Xero organisation(s) the access token has access to — returns name, base currency, country, fiscal year start, tax settings, and edition. It is categorised as a Read tool in the Mcp Afip MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_organisations? +

Register the Mcp Afip MCP server in PolicyLayer and add a rule for list_organisations: 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 Mcp Afip. Nothing to install.

What risk level is list_organisations? +

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

Can I rate-limit list_organisations? +

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

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

list_organisations is provided by the Mcp Afip MCP server (codespar/mcp-dev-latam). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Mcp Afip tool call.

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

CHECK YOUR STACK →