check_calendar_availability_tool
AI agents call check_calendar_availability_tool to retrieve information from IMAP MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Despite the empty description limiting confidence, the tool name strongly suggests querying/checking calendar availability rather than modifying, executing code, deleting, or financial actions. Calendar availability checks retrieve information without side effects.
From the tool's definition Tool name 'check_calendar_availability_tool' indicates a calendar availability check, which is a read operation on calendar data.
Documented attack patterns abuse exactly the kind of access check_calendar_availability_tool gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and IMAP MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for check_calendar_availability_tool:
{
"version": "1",
"default": "deny",
"tools": {
"check_calendar_availability_tool": {}
}
}check_calendar_availability_tool is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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check_calendar_availability_tool. It is categorised as a Read tool in the IMAP MCP Server MCP Server, which means it retrieves data without modifying state.
Register the IMAP MCP Server MCP server in PolicyLayer and add a rule for check_calendar_availability_tool: 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 IMAP MCP Server. Nothing to install.
check_calendar_availability_tool 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 check_calendar_availability_tool 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 check_calendar_availability_tool. 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.
check_calendar_availability_tool is provided by the IMAP MCP Server MCP server (non-dirty/imap-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 16 IMAP MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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16 IMAP MCP Server tools catalogued and risk-classified — across an index of 42,500+ MCP servers.