AI agents call list_inbox_access to retrieve information from Frontapp MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and displays information about user access permissions to an inbox. It performs a read-only query with no side effects, no code execution, no data modification, and no destructive actions. The low severity reflects minimal blast radius—even if misused by an agent, listing access permissions cannot harm data or trigger unintended operations.
From the tool's definition Tool name 'list_inbox_access' and description 'List all teammates with access to an inbox' indicate a retrieval operation that queries existing access permissions without modifying or executing any actions.
Documented attack patterns abuse exactly the kind of access list_inbox_access gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Frontapp MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_inbox_access:
{
"version": "1",
"default": "deny",
"tools": {
"list_inbox_access": {}
}
}list_inbox_access is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all teammates with access to an inbox. It is categorised as a Read tool in the Frontapp MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Frontapp MCP Server MCP server in PolicyLayer and add a rule for list_inbox_access: 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 Frontapp MCP Server. Nothing to install.
list_inbox_access 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 list_inbox_access 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 list_inbox_access. 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.
list_inbox_access is provided by the Frontapp MCP Server MCP server (zqushair/frontapp-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Frontapp MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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151 Frontapp MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.