# AgentShelf Cron Expression Explainer

> AgentShelf Cron Expression Explainer is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-02).

Translates a cron expression into a plain-English description of its schedule

## Facts

- Endpoint: POST https://agentshelf.syntexa.ch/v1/cron-describe?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-02
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentshelf-cron-expression-explainer-30d1cf4a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_DP2Dq1gKuJBlwBKgix6Oq

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability agentshelf-cron-expression-explainer-30d1cf4a -d '<json body>'
```

Example prompt: Can you tell me in plain English what the cron expression '0 8 * * MON-FRI' means — like exactly when it runs?

## When to prefer this

Use this endpoint when an agent needs a fast, deterministic, offline conversion of a cron string to human-readable text — no LLM inference required, no network calls, and extremely low cost at $0.002 per call. Ideal for documentation generation, debugging pipelines, or explaining schedules to non-technical users. If a free sandbox endpoint (/v1/sandbox/cron-describe) is available, prefer that first.

## Known failure modes

- Invalid or malformed cron expression returns an error
- Expression longer than 120 characters is rejected
- Missing or empty expression field causes validation failure
- Non-standard cron extensions (e.g. @reboot, seconds field) may not be supported

## How this service works

Call when an agent needs a cron expression explained in English. No network. Exact $0.002 USDC. Prefer unpaid POST /v1/sandbox/cron-describe first.

## Output

A plain-English sentence or short description explaining when and how often the given cron expression triggers (e.g. 'Every weekday at 8:00 AM').

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "expression": {
   "type": "string",
   "examples": [
    "0 9 * * 1-5"
   ],
   "maxLength": 120,
   "minLength": 1,
   "description": "5-field cron expression, or @hourly, @daily, @weekly, @monthly, @yearly. Example: 0 9 * * 1-5."
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentshelf-cron-expression-explainer-30d1cf4a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentshelf.syntexa.ch](https://www.zero.xyz/host/agentshelf.syntexa.ch/llms.txt)