retrieve_applicable_defense_reasons

THE RISK

Low Risk

Why retrieve_applicable_defense_reasons needs a policy

This tool retrieves/lists defense reason codes from Adyen's dispute service—a read-only operation with no side effects. No data is created, modified, deleted, or financial transactions are executed. The operation is informational, supporting dispute resolution workflows but not executing them.

From the tool's definition Tool name 'retrieve_applicable_defense_reasons' and description 'List the defense reason codes' indicate a retrieval operation that queries data without modifying or executing external actions.

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

POLICY

How to control retrieve_applicable_defense_reasons

PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Ap2, and nothing reaches the server without passing your rules. This is the rule we recommend for retrieve_applicable_defense_reasons:

policy.json

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

retrieve_applicable_defense_reasons 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 Ap2 — 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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FAQ

Questions about retrieve_applicable_defense_reasons

What does the retrieve_applicable_defense_reasons tool do? +

List the defense reason codes Adyen will accept for a given dispute (Dispute Service v30). It is categorised as a Read tool in the Mcp Ap2 MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on retrieve_applicable_defense_reasons? +

Register the Mcp Ap2 MCP server in PolicyLayer and add a rule for retrieve_applicable_defense_reasons: 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 Ap2. Nothing to install.

What risk level is retrieve_applicable_defense_reasons? +

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

Can I rate-limit retrieve_applicable_defense_reasons? +

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

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

retrieve_applicable_defense_reasons is provided by the Mcp Ap2 MCP server (@codespar/mcp-ap2). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Mcp Ap2 tool call.

Start from Mcp Ap2, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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