What happens if the user cancels the add-on now: addon size vs plan quota, over-quota delta, sample of largest at-risk files, 7-day grace note. Read-only.
AI agents call drive_addon_cancellation_preview to retrieve information from TrekMail MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool only previews the consequences of a cancellation (quota deltas, at-risk files, grace period info) without actually executing any cancellation. It is explicitly described as read-only, making it a pure data retrieval/query operation with minimal risk.
From the tool's definition 'What happens if the user cancels the add-on now' and explicitly 'Read-only' — retrieves preview/simulation data with no side effects
Attacks that exploit this kind of access
What happens if the user cancels the add-on now: addon size vs plan quota, over-quota delta, sample of largest at-risk files, 7-day grace note. Read-only. It is categorised as a Read tool in the TrekMail MCP Server MCP Server, which means it retrieves data without modifying state.
Register the TrekMail MCP Server MCP server in PolicyLayer and add a rule for drive_addon_cancellation_preview: 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 TrekMail MCP Server. Nothing to install.
drive_addon_cancellation_preview 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 drive_addon_cancellation_preview 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 drive_addon_cancellation_preview. 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.
drive_addon_cancellation_preview is provided by the TrekMail MCP Server MCP server (trekmail/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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