CyberChef MCP Server

cyberchef_cache_stats

Read-onlyIdempotent

Retrieve cache statistics for hits, misses, size, and items to assess cache efficiency and diagnose issues.

Instructions

Get cache statistics including hits, misses, size, and items.

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_cache_stats"
  }
}

Input Schema

Name	Required	Description	Default
No arguments

Schema Changelog

Changes observed during successful MCP inspections.

First observedv3.6.0Sep 4, 2026

TDQS

A3.8/5.0

Behavior3/5

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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint, and the description is consistent with them. It adds the list of reported metrics but does not disclose extra behavioral details such as whether statistics are cumulative or reset by cache_clear.

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 efficient sentence with no filler; every word contributes to meaning and the key scoping phrase 'cache statistics' is front-loaded.

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

Completeness4/5

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

For a zero-parameter read-only utility the description is nearly complete, listing the essential output fields. It falls slightly short of 5 because it does not clarify units or semantics for 'size,' which could mean bytes, entries, or another measure.

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 and schema coverage is 100%, so there is nothing for the description to clarify. The baseline of 4 applies because no parameter semantics are needed.

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 resource ('cache statistics') and enumerates the exact metrics returned (hits, misses, size, items). This clearly distinguishes it from siblings like cyberchef_cache_clear (mutation) and cyberchef_worker_stats (different resource).

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

Usage Guidelines2/5

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

No guidance is given about when to prefer this tool over alternatives or when not to use it. While the name and read-only annotations imply it is for inspection, the description does not state exclusions or mention cache_clear/worker_stats as alternatives.

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