AI agents call getAttachmentsId to retrieve information from Mcp Upbank without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves attachment data without side effects. It is a standard read operation on banking data. Severity is low because attachments are typically supporting documents with limited sensitive content compared to transaction details, and the operation cannot modify or delete data.
From the tool's definition Tool name 'getAttachmentsId' and description 'Retrieve attachment' indicate a retrieval operation. Server description explicitly states 'read-only mode'. No modification, deletion, execution, or financial operations are performed.
Documented attack patterns abuse exactly the kind of access getAttachmentsId gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Upbank, and nothing reaches the server without passing your rules. This is the rule we recommend for getAttachmentsId:
{
"version": "1",
"default": "deny",
"tools": {
"getAttachmentsId": {}
}
}getAttachmentsId is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Retrieve attachment. It is categorised as a Read tool in the Mcp Upbank MCP Server, which means it retrieves data without modifying state.
Register the Mcp Upbank MCP server in PolicyLayer and add a rule for getAttachmentsId: 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 Upbank. Nothing to install.
getAttachmentsId is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the getAttachmentsId 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.
Set action: deny in the PolicyLayer policy for getAttachmentsId. 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.
getAttachmentsId is provided by the Mcp Upbank MCP server (sirmews/mcp-upbank). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Mcp Upbank, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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13 Mcp Upbank tools catalogued and risk-classified — across an index of 43,000+ MCP servers.