List inbox app installations. Requires a registered third-party system (FUB_SYSTEM + FUB_SYSTEM_KEY). On unregistered accounts FUB returns 404.
AI agents call listInboxAppInstallations to retrieve information from Follow Up Boss MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves a list of inbox app installations without creating, modifying, deleting, or executing any operations. It is a pure read operation that returns data to the caller. The requirement for proper credentials (FUB_SYSTEM + FUB_SYSTEM_KEY) is a standard access control measure and does not elevate the risk category.
From the tool's definition The tool name is 'listInboxAppInstallations' and the description states 'List inbox app installations', which is a retrieval operation with no side effects.
Attacks that exploit this kind of access
List inbox app installations. Requires a registered third-party system (FUB_SYSTEM + FUB_SYSTEM_KEY). On unregistered accounts FUB returns 404. It is categorised as a Read tool in the Follow Up Boss MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Follow Up Boss MCP Server MCP server in PolicyLayer and add a rule for listInboxAppInstallations: 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 Follow Up Boss MCP Server. Nothing to install.
listInboxAppInstallations 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 listInboxAppInstallations 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 listInboxAppInstallations. 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.
listInboxAppInstallations is provided by the Follow Up Boss MCP Server MCP server (nerdsnipe-inc/follow-up-boss-mcp). 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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