failing-tool

A tool that always fails (for testing error handling)

SERVERFrontmcp SOURCEagentfront/frontmcp

Low RISK CLASS

Category Other

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/frontmcp/failing-tool.md

WHAT IT DOES

What failing-tool does on Frontmcp

AI agents call failing-tool as a supporting operation in Frontmcp workflows.

RISK

Why failing-tool is rated Low

This is a test/diagnostic tool explicitly designed to always fail for error handling testing purposes. It does not read, write, execute, delete, or move money — it simply throws an error. Any misuse by an AI agent would result in a failure with no side effects, making it effectively inert in terms of data or system impact.

From the tool's definition A tool that always fails (for testing error handling)

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs failing-tool safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Frontmcp, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For failing-tool, this is the rule to start with:

failing-tool Rate-limited

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

View as policy code

policy.json

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

SET A RULE FOR THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Frontmcp, apply this rule, and every failing-tool call is checked against it from then on.

FAQ

Questions about failing-tool

What does the failing-tool tool do? +

A tool that always fails (for testing error handling). It is categorised as a Other tool in the Frontmcp MCP Server, which means it performs auxiliary operations.

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

Register the Front MCP server in PolicyLayer and add a rule for failing-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 Frontmcp. Nothing to install.

What risk level is failing-tool? +

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

Can I rate-limit failing-tool? +

Yes. Add a rate_limit block to the failing-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 failing-tool completely? +

Set action: deny in the PolicyLayer policy for failing-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 failing-tool? +

failing-tool is provided by the Front MCP server (agentfront/frontmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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