// MCP TOOL REFERENCE

retry_transaction

Retry a failed, expired, or rejected workflow execution. Creates a new workflow execution on the same account, optionally re-using the original workflow definition and customer references.

ServerMcp Ap2
CategoryFinancial

How to control retry_transaction ↓

WHAT IT DOES

What retry_transaction does on Mcp Ap2

AI agents use retry_transaction to commit financial operations through Mcp Ap2 — usually the final step of a payment, billing, or trading workflow. A call moves real money.

THE RISK

Critical Risk

Why retry_transaction needs a policy

This tool operates within a payment protocol (AP2) and explicitly creates a new workflow execution, which in this context means initiating a new financial transaction attempt. Retrying a payment directly triggers financial obligations, placing it in the Financial category. Misuse could result in duplicate charges or unauthorized payment retries, making severity critical.

From the tool's definition retry_transaction — 'Creates a new workflow execution on the same account' for a payment protocol (AP2 — Google's Agent-to-Agent Payment Protocol). Retrying a failed/expired/rejected transaction initiates a new financial workflow execution.

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

POLICY

How to control retry_transaction

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 retry_transaction:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "retry_transaction": {
      "deny_if": [
        {
          "conditions": [],
          "on_deny": "Requires human approval."
        }
      ]
    }
  }
}

Any call to retry_transaction is blocked until a human approves it. The rest of the server keeps working.

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

Related tools and policies

More Mcp Ap2 tools

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All 1300 Mcp Ap2 tools →

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Go deeper

Critical-risk tools in Mcp Ap2 → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Human-in-the-loop → When a tool call should wait for a person — and when policy can decide alone.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
How to Add Spending Controls to Any MCP Agent →
Rate Limiting MCP Tool Calls: A Practical Guide →

FAQ

Questions about retry_transaction

What does the retry_transaction tool do? +

Retry a failed, expired, or rejected workflow execution. Creates a new workflow execution on the same account, optionally re-using the original workflow definition and customer references. It is categorised as a Financial tool in the Mcp Ap2 MCP Server, which means it involves financial transactions. Block by default and require explicit approval.

How do I enforce a policy on retry_transaction? +

Register the Mcp Ap2 MCP server in PolicyLayer and add a rule for retry_transaction: 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 retry_transaction? +

retry_transaction is a Financial tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit retry_transaction? +

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

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

retry_transaction 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.

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