AI agents call vercel-blob-list to retrieve information from Mcp Gmail without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and queries blob storage contents. It performs no creation, modification, deletion, or execution of arbitrary operations. The optional filtering and pagination are parameters to control what data is returned, not to modify or destroy data. This is a classic Read operation with minimal risk.
From the tool's definition Tool description explicitly states 'List blobs in Vercel Blob storage with optional filtering and pagination.' The verb 'list' and the retrieval-focused operation with filtering/pagination parameters indicate data query functionality without side effects.
Attacks that exploit this kind of access
List blobs in Vercel Blob storage with optional filtering and pagination. It is categorised as a Read tool in the Mcp Gmail MCP Server, which means it retrieves data without modifying state.
Register the Mcp Gmail MCP server in PolicyLayer and add a rule for vercel-blob-list: 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 Gmail. Nothing to install.
vercel-blob-list 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 vercel-blob-list 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 vercel-blob-list. 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.
vercel-blob-list is provided by the Mcp Gmail MCP server (@monsoft/mcp-gmail). 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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