Update stock for a product at a warehouse
AI agents use update_stock to create or update resources in Mcp Ap2 — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Mcp Ap2 environment.
This tool modifies inventory records, which is a reversible write operation. It affects stock levels but does not delete data or commit financial transactions. The high severity reflects that incorrect stock updates could cascade through supply chain operations, orders, and fulfillment processes, potentially causing significant business disruption.
From the tool's definition Tool description states 'Update stock for a product at a warehouse' — a direct modification operation that changes inventory data.
Documented attack patterns abuse exactly the kind of access update_stock gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Ap2, and nothing reaches the server without passing your rules. This is the rule we recommend for update_stock:
{
"version": "1",
"default": "deny",
"tools": {
"update_stock": {
"limits": [
{
"counter": "update_stock_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}update_stock stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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Update stock for a product at a warehouse. It is categorised as a Write tool in the Mcp Ap2 MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Mcp Ap2 MCP server in PolicyLayer and add a rule for update_stock: 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 Mcp Ap2. Nothing to install.
update_stock is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the update_stock 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 update_stock. 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.
update_stock is provided by the Mcp Ap2 MCP server (@codespar/mcp-ap2). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Mcp Ap2, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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