Total inventory value (Σ available × variant.price) optionally scoped to a location. Variants without price data are reported under missing_price_count.
AI agents call inventory_value to retrieve information from Sapo without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves and aggregates existing inventory data (available quantities multiplied by variant prices) without modifying state, executing commands, or triggering side effects. It is a straightforward query/calculation operation that reads inventory metrics from the system.
From the tool's definition Tool description states it calculates 'Total inventory value' and reports metrics; uses passive language ('are reported') indicating data retrieval with no creation, modification, deletion, or execution of external operations.
Documented attack patterns abuse exactly the kind of access inventory_value gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Sapo, and nothing reaches the server without passing your rules. This is the rule we recommend for inventory_value:
{
"version": "1",
"default": "deny",
"tools": {
"inventory_value": {}
}
}inventory_value is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Total inventory value (Σ available × variant.price) optionally scoped to a location. Variants without price data are reported under missing_price_count. It is categorised as a Read tool in the Sapo MCP Server, which means it retrieves data without modifying state.
Register the Sapo MCP server in PolicyLayer and add a rule for inventory_value: 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 Sapo. Nothing to install.
inventory_value 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 inventory_value 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 inventory_value. 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.
inventory_value is provided by the Sapo MCP server (nguyennguyenit/sapo-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Sapo, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
93 Sapo tools catalogued and risk-classified — across an index of 43,000+ MCP servers.