CyberChef MCP Server

cyberchef_worker_stats

Read-onlyIdempotent

Retrieve worker thread pool statistics—thread count, utilization, and completed tasks—to monitor CyberChef performance when ENABLE_WORKERS is true.

Instructions

Get worker thread pool statistics including thread count, utilization, and completed tasks. Only available when ENABLE_WORKERS=true.

Tool call template

This tool declares no required parameters. Add optional parameters from the input schema as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {},
    "name": "cyberchef_worker_stats"
  }
}

Input Schema

Name	Required	Description	Default
No arguments

Schema Changelog

Changes observed during successful MCP inspections.

First observedv3.6.0Sep 4, 2026

TDQS

A4.5/5.0

Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already mark the tool as read-only, idempotent, and non-destructive. The description adds valuable behavioral context beyond annotations by specifying the availability condition (ENABLE_WORKERS=true) and detailing the statistics returned.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, information-dense sentence. It front-loads the core purpose and then adds the key availability constraint without any redundant filler.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a zero-parameter, read-only stats tool, the description is complete: it states what the tool does, what data it returns, and the environment flag required. No additional input or safety context is needed given the rich annotations.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

The tool has zero parameters, so the description cannot add parameter meaning beyond the schema. With no parameters, the baseline is 4, and the description appropriately focuses on output scope rather than inputs.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description uses a specific verb ('Get') and a precise resource ('worker thread pool statistics'), listing the exact data returned. This clearly distinguishes it from sibling stats tools like cache_stats and deprecation_stats.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

The description implies when to use this tool: when worker thread pool statistics are needed. It also provides a clear prerequisite and exclusion: the tool is only available when ENABLE_WORKERS=true, signaling not to use it otherwise.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.