Get a statistical summary of expenses (count per category) for all users.
AI agents call get_expense_stats to retrieve information from Identity-Aware MCP Server with Azure Cosmos DB without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This is primarily a Read operation (retrieves/queries data without modification). However, it aggregates sensitive financial data across all users, which elevates severity to medium due to potential information disclosure risks. If access control is not properly enforced based on Entra group membership, this could expose financial information about other users.
From the tool's definition Tool description states 'Get a statistical summary of expenses' which is a retrieval operation with no side effects. However, the key qualifier is 'for all users' - this retrieves aggregated data across the entire user base, not just the caller's own data.
Risk signalsBulk/mass operation — affects multiple targets
Documented attack patterns abuse exactly the kind of access get_expense_stats gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Identity-Aware MCP Server with Azure Cosmos DB, and nothing reaches the server without passing your rules. This is the rule we recommend for get_expense_stats:
{
"version": "1",
"default": "deny",
"tools": {
"get_expense_stats": {}
}
}get_expense_stats is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Get a statistical summary of expenses (count per category) for all users. It is categorised as a Read tool in the Identity-Aware MCP Server with Azure Cosmos DB MCP Server, which means it retrieves data without modifying state.
Register the Identity-Aware MCP Server with Azure Cosmos DB MCP server in PolicyLayer and add a rule for get_expense_stats: 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 Identity-Aware MCP Server with Azure Cosmos DB. Nothing to install.
get_expense_stats 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 get_expense_stats 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 get_expense_stats. 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.
get_expense_stats is provided by the Identity-Aware MCP Server with Azure Cosmos DB MCP server (pamelafox/azure-cosmosdb-identity-aware-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Identity-Aware MCP Server with Azure Cosmos DB, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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3 Identity-Aware MCP Server with Azure Cosmos DB tools catalogued and risk-classified — across an index of 43,000+ MCP servers.