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Delx MCP Server

Delx MCP Server

by davidmosiah
OverviewSchemaSourceRelated ServersDiscussionsAdmin
JavaScript
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Cron Describe

util_cron_describe
Read-onlyIdempotent

Validates a cron expression and describes it in plain English, listing the next 5 scheduled run times.

Instructions

Validate and describe a cron expression in plain English. Shows next 5 scheduled runs. Delx Agent Utilities are separate from the free witness protocol and may expose x402 utility pricing.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "expression": "<expression>"
    },
    "name": "util_cron_describe"
  }
}

Input Schema

NameRequiredDescriptionDefault
expressionYesCron expression (5 fields: min hour dom month dow)

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.2.8

TDQS

A4/5.0
Behavior4/5

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

Annotations already indicate readOnly, idempotent, and non-destructive behavior. The description adds that it shows next 5 runs and mentions x402 utility pricing and protocol separation, providing useful context beyond annotations.

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?

Two sentences, front-loaded with the primary purpose and output. The second sentence adds relevant context about pricing without redundancy.

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 simple utility with one parameter, the description adequately covers purpose, output (next runs), and behavioral notes (pricing). Lack of output schema is compensated by stating output is in plain English and includes next runs.

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

Parameters3/5

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

The parameter 'expression' is fully described in the schema. The description repeats 'cron expression' without adding new format or constraint details, meeting the baseline for high schema coverage.

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 clearly states the tool validates and describes a cron expression in plain English and shows next 5 scheduled runs. It uses specific verbs and resource, distinguishing it from sibling utility tools.

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

Usage Guidelines3/5

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

Usage is implied by the description (use when needing to understand a cron expression), but no explicit guidance on when to use vs alternatives or when not to use is provided.

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

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