ToolVet
80trust / 100

Dev Cron Describe

by AgentTools in Developer tools

x402 APIPassing, checked 3 h ago

Turn a cron expression into plain English, validate it, and compute the exact next execution times. Deterministic — the answer to 'when does this cron actually fire?' without guessing. Use this when an agent needs to explain a cron expression and compute the next runs.

GET https://agentstoolshub.com/api/v1/dev/cron-describe

Last 30 days

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Status and outage history · Atom feed

Uptime
100%
Response time
151 ms typical, 204 ms slowest 5%
Last check
3 h ago
Next check
any minute now

How to call it

GET https://agentstoolshub.com/api/v1/dev/cron-describe

Each call costs $0.002 in USDC on Base, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

GET https://agentstoolshub.com/api/v1/dev/cron-describe?expr=0+9+*+*+1-5&ref=2026-10-01T09%3A00%3A00Z

Parameters

ParameterTypeRequiredDescription
exprstringYes5 fields: minute hour day month weekday
refstringNoReference date (optional)

Example response

The provider's example. We can't check it without paying.

Example response, 51 lines
{
  "result": {
    "answer": "At 09:00 AM, Monday through Friday",
    "answerLabel": "\"0 9 * * 1-5\"",
    "details": [
      {
        "label": "Fields",
        "value": "5 (minute hour day month weekday)"
      },
      {
        "label": "Reference",
        "value": "2026-10-01T09:00:00.000Z"
      }
    ],
    "steps": [
      "Validate 5-field cron syntax",
      "Render plain-English description",
      "Iterate the schedule 5 times from the reference moment"
    ],
    "table": {
      "columns": [
        "#",
        "Next execution (UTC)"
      ],
      "rows": [
        [
          1,
          "2026-10-02T09:00:00.000Z"
        ],
        [
          2,
          "2026-10-05T09:00:00.000Z"
        ],
        [
          3,
          "2026-10-06T09:00:00.000Z"
        ],
        [
          4,
          "2026-10-07T09:00:00.000Z"
        ],
        [
          5,
          "2026-10-08T09:00:00.000Z"
        ]
      ]
    },
    "value": null
  },
  "tool": "cron-describe"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.002.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://agentstoolshub.com/api/v1/dev/cron-describe?expr=0+9+*+*+1-5&ref=2026-10-01T09%3A00%3A00Z'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - 'https://agentstoolshub.com/api/v1/dev/cron-describe?expr=0+9+*+*+1-5&ref=2026-10-01T09%3A00%3A00Z' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.002 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.002" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.002 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fagentstoolshub.com%2Fapi%2Fv1%2Fdev%2Fcron-describe
const res = await pay("https://agentstoolshub.com/api/v1/dev/cron-describe?expr=0+9+*+*+1-5&ref=2026-10-01T09%3A00%3A00Z");
console.log(res.status, await res.text());
Python: pay and call
# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.002 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.002"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://agentstoolshub.com/api/v1/dev/cron-describe?expr=0+9+*+*+1-5&ref=2026-10-01T09%3A00%3A00Z")
    print(res.status_code, res.text)

Security scan

  • No findings. We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.

Recent checks

WhenResultHTTPTimePrice
3 h agoPassed402183 ms$0.002
7 h agoPassed402388 ms$0.002
11 h agoPassed402165 ms$0.002
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2 days agoPassed402135 ms$0.002