invalid-tool

THE RISK

Low Risk

Why invalid-tool needs a policy

The tool name 'invalid-tool' and the minimal description 'Short' provide no meaningful information about what this tool does. It cannot be confidently classified into any functional category. Confidence is very low due to the lack of descriptive content.

From the tool's definition Tool name is 'invalid-tool' and description is only 'Short', which is uninformative and does not describe any clear action or functionality.

Documented attack patterns abuse exactly the kind of access invalid-tool gives an agent:

POLICY

How to control invalid-tool

PolicyLayer is an MCP gateway — it sits between your AI agents and Tally MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for invalid-tool:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "invalid-tool": {
      "limits": [
        {
          "counter": "invalid-tool_rate",
          "window": "minute",
          "max": 60,
          "scope": "grant"
        }
      ]
    }
  }
}

invalid-tool gets a rate cap, and everything else on the server is denied unless you say otherwise.

Create a free account and register Tally MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

SET A RULE FOR THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Tool risk categories → How PolicyLayer classifies MCP tools by what they can do.
MCP tool → What an MCP tool is and how clients discover and call it.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about invalid-tool

What does the invalid-tool tool do? +

Short. It is categorised as a Other tool in the Tally MCP MCP Server, which means it performs auxiliary operations.

How do I enforce a policy on invalid-tool? +

Register the Tally MCP server in PolicyLayer and add a rule for invalid-tool: 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 Tally MCP. Nothing to install.

What risk level is invalid-tool? +

invalid-tool is a Other tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit invalid-tool? +

Yes. Add a rate_limit block to the invalid-tool 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.

How do I block invalid-tool completely? +

Set action: deny in the PolicyLayer policy for invalid-tool. 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.

What MCP server provides invalid-tool? +

invalid-tool is provided by the Tally MCP server (learnwithcc/tally-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Tally MCP tool call.

Start from Tally MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →