Get metadata about an attachment (filename, size, MIME type)
AI agents call gmail.getAttachmentMetadata to retrieve information from Gmail MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool only queries and returns information about attachment properties without altering, executing, or deleting any data. The metadata retrieved (filename, size, MIME type) is informational only. No side effects or irreversible actions are possible through this tool's invocation.
From the tool's definition Tool retrieves metadata about an attachment (filename, size, MIME type) with no modification, deletion, or execution capability. Matches 'get' pattern in Read category: 'retrieves or queries data; no side effects (search, list, get, fetch)'.
Attacks that exploit this kind of access
Get metadata about an attachment (filename, size, MIME type). It is categorised as a Read tool in the Gmail MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Gmail MCP Server MCP server in PolicyLayer and add a rule for gmail.getAttachmentMetadata: 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 Gmail MCP Server. Nothing to install.
gmail.getAttachmentMetadata 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 gmail.getAttachmentMetadata 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 gmail.getAttachmentMetadata. 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.
gmail.getAttachmentMetadata is provided by the Gmail MCP Server MCP server (shcallaway/gmail-mcp-server). 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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