Download a specific attachment from a feed item (transaction). Returns the attachment as base64 encoded data.
AI agents call feed_item_attachment_download to retrieve information from Starling Bank without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves an existing attachment associated with a transaction/feed item and returns it as base64-encoded data. There is no creation, modification, deletion, or execution of external operations. While the data may be sensitive (financial account attachments), the action itself is purely read-only with no blast radius beyond information disclosure.
From the tool's definition Tool description states 'Download a specific attachment from a feed item (transaction). Returns the attachment as base64 encoded data.' The verb 'download' and 'returns' indicate data retrieval with no modification or side effects.
Attacks that exploit this kind of access
Download a specific attachment from a feed item (transaction). Returns the attachment as base64 encoded data. It is categorised as a Read tool in the Starling Bank MCP Server, which means it retrieves data without modifying state.
Register the Starling Bank MCP server in PolicyLayer and add a rule for feed_item_attachment_download: 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 Starling Bank. Nothing to install.
feed_item_attachment_download 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 feed_item_attachment_download 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 feed_item_attachment_download. 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.
feed_item_attachment_download is provided by the Starling Bank MCP server (starling-bank-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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