combinator-tool

A tool testing nested combinators (anyOf with allOf and not)

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/combinator-tool.md

WHAT IT DOES

What combinator-tool does on Frontmcp

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

RISK

Why combinator-tool is rated Low

The description indicates this is a testing tool for nested schema combinators (anyOf, allOf, not), which are JSON Schema constructs. There is no evidence of data reads, writes, execution of code, destructive actions, or financial operations. It appears to be a framework-level validation/testing utility. Confidence is low because the description is vague and does not clarify what the tool actually does at runtime.

From the tool's definition 'A tool testing nested combinators (anyOf with allOf and not)' — describes a testing/validation utility for schema combinators

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs combinator-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 combinator-tool, this is the rule to start with:

combinator-tool Rate-limited

combinator-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": {
    "combinator-tool": {
      "limits": [
        {
          "counter": "combinator-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 combinator-tool call is checked against it from then on.

FAQ

Questions about combinator-tool

What does the combinator-tool tool do? +

A tool testing nested combinators (anyOf with allOf and not). 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 combinator-tool? +

Register the Front MCP server in PolicyLayer and add a rule for combinator-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 combinator-tool? +

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

Can I rate-limit combinator-tool? +

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

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

combinator-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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