{
  "id": "CMP-010",
  "slug": "cmp-010",
  "title": "HELP and STOP replies should fit in a single 160-character segment",
  "statement": "The HELP and opt-out reply bodies should each fit within 160 characters.",
  "rationale": "A HELP or STOP reply over 160 characters is delivered as a multi-part message, and the parts can arrive out of order or be dropped independently — so the recipient asking for help receives half an answer, or an opt-out confirmation that reads as a fresh marketing message. The 320-character general bound tempts authors into two segments for replies that gain nothing from the extra room.",
  "layer": "CAMPAIGN",
  "layerSlug": "campaign",
  "object": "campaign.help_message + campaign.optout_message",
  "severity": "MEDIUM",
  "detectability": [
    "DETERMINISTIC"
  ],
  "failureClass": "RETRY_FIELD",
  "authorities": [
    "AWS"
  ],
  "applicabilityText": "Applies to every 10DLC registration.",
  "universal": true,
  "remediation": "Cut the reply to one segment by dropping the marketing sentence rather than the disclosures — the brand name, the contact route and the STOP instruction all have to stay. Done when both replies are at or under 160 characters.",
  "example": "help_message: \"Acme Coffee Rewards: for help email support@acmecoffee.com or call 415-555-0134. Reply STOP to unsubscribe.\" (110 characters)",
  "notes": "AWS's registration form enforces 160 on these two bodies, tighter than the 320 that CMP-AUTOREPLY-LEN applies from Twilio and Bandwidth. Graded MEDIUM and worded as a fit-in-one-segment rule because the 320 bound is what most providers reject on; this one catches the message that will be split in delivery.",
  "catalogIds": [
    "MSG-013",
    "MSG-016"
  ],
  "phase": "approval",
  "automated": true,
  "url": "https://ekas.io/rules/10dlc/campaign/cmp-010/",
  "markdown": "https://ekas.io/rules/10dlc/campaign/cmp-010.md",
  "registry": "https://ekas.io/rules/10dlc/",
  "updated": "2026-07-25",
  "licence": "CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/"
}