AI agents invoke subtract to trigger actions in Awesome-MCP-Scaffold. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.
This tool performs arithmetic subtraction, which is a computation/execution of an operation. It has no side effects on data, files, or external systems. Severity is low as the blast radius of misuse is negligible — at worst it returns an incorrect numerical result. Confidence is moderate since the description is minimal but the intent is clear from the name and description.
From the tool's definition Subtract second number from first
Documented attack patterns abuse exactly the kind of access subtract gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Awesome-MCP-Scaffold, and nothing reaches the server without passing your rules. This is the rule we recommend for subtract:
{
"version": "1",
"default": "deny",
"tools": {
"subtract": {
"limits": [
{
"counter": "subtract_rate",
"window": "minute",
"max": 10,
"scope": "grant"
}
]
}
}
}subtract stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.
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Subtract second number from first. It is categorised as a Execute tool in the Awesome-MCP-Scaffold MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.
Register the Awesome-MCP-Scaffold MCP server in PolicyLayer and add a rule for subtract: 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 Awesome-MCP-Scaffold. Nothing to install.
subtract is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.
Yes. Add a rate_limit block to the subtract 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 subtract. 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.
subtract is provided by the Awesome-MCP-Scaffold MCP server (ww-ai-lab/awesome-mcp-scaffold). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Awesome-MCP-Scaffold, 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.
24 Awesome-MCP-Scaffold tools catalogued and risk-classified — across an index of 43,000+ MCP servers.