make_app_closeout_txn

THE RISK

Medium Risk

Why make_app_closeout_txn needs a policy

This tool creates (Write) rather than executes arbitrary code (Execute), and does not irreversibly destroy data (Destructive). Creating a closeout transaction modifies the user's blockchain state and application account bindings. While the operation itself is recorded on-chain and cannot be undone once confirmed, the tool itself only creates the transaction object—signing and submission are separate steps.

From the tool's definition The tool creates a transaction that closes out an application. The verb "Create" and action "close out" indicate it modifies blockchain state by finalizing an application relationship, which is a reversible write operation (the application can be reopened or…

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

POLICY

How to control make_app_closeout_txn

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

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "make_app_closeout_txn": {
      "limits": [
        {
          "counter": "make_app_closeout_txn_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

make_app_closeout_txn 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.

Create a free account and register Algorand MCP — 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

Govern customer-ops agents → PII redaction, approval on external messages, and no-bulk-delete rules on the records agents change.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Argument validation → Checking tool call arguments against schema and policy before they run.
Scoped token → Per-person credentials that grant a defined subset of servers and tools.
Rate Limiting MCP Tool Calls: A Practical Guide →
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PolicyLayer vs alternatives → How deterministic, per-call MCP policy compares with gateways, identity layers, and authorisation platforms.

FAQ

Questions about make_app_closeout_txn

What does the make_app_closeout_txn tool do? +

Create an application close out transaction. It is categorised as a Write tool in the Algorand MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on make_app_closeout_txn? +

Register the Algorand MCP server in PolicyLayer and add a rule for make_app_closeout_txn: 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 Algorand MCP. Nothing to install.

What risk level is make_app_closeout_txn? +

make_app_closeout_txn is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit make_app_closeout_txn? +

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

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

make_app_closeout_txn is provided by the Algorand MCP server (goplausible/algorand-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Algorand MCP tool call.

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

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