An AI text message generator turns a short brief ("remind Tuesday patients to confirm, keep it friendly") into a ready-to-send business text in seconds, which saves real time on reminders, promos and follow-ups. It also produces spammy phrasing, drops opt-out language and makes up offers, so every draft needs a check for carrier filters and accuracy before it goes to a list.
Speed is the easy part. Any large language model can write a cheerful 140-character promo. The hard part is that carriers filter content, not just unregistered senders, and AI models are trained on a lot of marketing copy that carriers have learned to distrust. This post covers what AI does well for SMS, the specific ways it fails, what those failures cost in segments, and how Ask AI, the assistant inside Ready, fits into a sane review process.
What an AI text message generator is good at
AI handles the repetitive parts of SMS copywriting well:
- First drafts. Getting from a blank box to something editable is the slowest step for most teams. AI removes it.
- Variations. Five versions of an appointment reminder at different tones takes one prompt, not twenty minutes.
- Length trimming. "Make this under 160 characters" is a task models handle reasonably well, though they still miscount sometimes (more on that below).
- Tone matching. A dental office and a streetwear brand need different voices, and a model can switch between them on request.
For a team sending a handful of campaigns a month plus reminder templates, that's a meaningful time saving. Copy quality is no longer the bottleneck. Accuracy and filtering become the bottleneck.
Three ways AI drafts get business texts in trouble
1. Spammy phrasing carriers already filter
Models default to high-energy marketing language because that's what they've read most of. Typical output looks like this:
🔥 HUGE SALE!!! Act NOW, 50% OFF everything! Limited time only, don't miss out! Click here: bit.ly/xyz
Nearly every element of that text matches a pattern carriers flag: all-caps words, stacked exclamation points, urgency phrases, a vague "click here" and a public link shortener. Registration doesn't protect you from content filtering. A campaign can be approved and still have individual messages blocked, which we cover in detail in the content-level blocking that registration doesn't fix. The shortener problem alone is worth reading about: shared bit.ly links get your texts silently filtered.
AI also drifts toward restricted content without being asked. Ask for a "fun promo for our bar's happy hour" and the model will write about drinks. Alcohol falls under the SHAFT categories (sex, hate, alcohol, firearms, tobacco), which carriers restrict or require age-gating for. If your registered campaign doesn't cover that content, the draft is a problem even if it reads well.
2. Missing identification and opt-out language
A model will rarely add your business name at the start of a message or "Reply STOP to opt out" at the end unless you tell it to. Both matter. Carriers expect the first message to a contact to identify the sender and explain how to opt out, and unidentified texts look like spam to recipients too, which drives complaints.
On Ready, inbound STOP and UNSUBSCRIBE replies are honored automatically and the opt-out carries across campaigns, so a contact who opts out can't be texted again from another campaign by mistake. That handles the mechanics. Including the opt-out instruction in the copy is still your job, and an AI draft won't do it reliably.
3. Made-up claims
This is the one that costs money or trust. Models fill gaps with plausible details: a "20% off" you never approved, a "today only" deadline that doesn't exist, a "free consultation" your clinic doesn't offer, or a store hour that's an hour off. A wrong reminder time sends patients to a closed office. A fake discount means honoring it or upsetting the customer. Treat every number, date, price and promise in an AI draft as unverified until a person checks it against reality.
Segment bloat: the cost nobody prompts for
AI drafts tend to run long and to include emoji. Both affect what you pay, because SMS is billed per segment:
- A plain GSM-7 segment holds 160 characters. Longer messages split into 153-character segments.
- One emoji (or any non-GSM character) switches the whole message to unicode: 70 characters for one segment, 67 per segment once it splits.
AI output is also full of curly quotes, long dashes and ellipses. On many platforms those quietly force unicode encoding too. Ready swaps them for plain characters before sending, so on Ready they never change the count. Emoji, however, are real unicode and do.
Worked example (assumptions stated): an AI writes a 175-character promo with one emoji. In unicode that's 175 ÷ 67 = 2.6, so 3 segments. You send it to 5,000 opted-in contacts on Ready's Standard rate of $0.0075/segment plus a $0.0045 carrier fee per segment:
| Version | Segments per text | Total segments | Rate cost | Carrier fees |
|---|---|---|---|---|
| AI draft, 175 chars + emoji | 3 | 15,000 | $300 | 15,000 × $0.0045 |
| Edited, 155 chars, no emoji | 1 | 5,000 | $100 | 5,000 × $0.0045 |
Cutting 20 characters and one emoji saves $200 in rate plus 10,000 carrier fees on one campaign. These figures exclude the compliance surcharge: scrubbing and landline validation are each $0.003 extra per segment when switched on for an account, and both are off by default.
The fix is simple: tell the model "under 155 characters, no emoji, plain punctuation" and then count the result yourself, because models miscount characters often.
How Ask AI drafts and checks texts in Ready
Ready has two AI tools for outbound copy, and they're built to be used together.
Ask AI, the assistant in the app, drafts a text from a short description of what you want to send. Paste the draft into the campaign or template composer, where the segment count shows as you type, so emoji and length costs show up before you send rather than on the bill.
Its spam check (ask it to check a text for spam words) reviews a draft for the kinds of content patterns that tend to get carrier-filtered, the same patterns described above: aggressive urgency, shouty formatting, risky links and similar signals. Use it on AI drafts and on hand-written copy alike. It's a risk reducer, not a guarantee. Carriers don't publish their filtering rules, and no tool can promise a message will deliver. What it does is catch the obvious problems before 5,000 contacts receive them.
Ready no longer lets accounts create AI reply agents. One set up earlier may still answer inbound texts on its own until you pause its automation in Automations, and the Take over button in the Inbox thread stops it in that conversation. On a new account, replies land in the Inbox (and in GoHighLevel for connected accounts), and a person on your team answers them. The in-app assistant can answer questions about your account and take actions when you ask, and it never sends a reply on its own.
The rest of the compliance stack runs regardless of who wrote the copy. Sends are held outside permitted local hours based on the recipient's area. Known litigator and DNC numbers can be screened out before sending. Your opt-in attestation is recorded per bulk send and per API send that sets consent_attested. That attestation records who sent, to how many and when. It isn't a per-contact consent record, so your opt-in form or store still needs to keep each contact's opt-in time, wording and page. Compliance stays the sender's responsibility. These tools reduce risk; they don't remove it. Campaigns, drip campaigns and automations wait up to 24 hours for the window; a one-to-one or API text is held only if the window opens within 6 hours, otherwise it is refused and must be resent; a one-to-one reply to someone who texted you in the last 24 hours goes out at any hour.
A review checklist for every AI draft
Before an AI-generated text goes to a list, check these points:
- Sender named in the first few words ("Bright Dental:" not "Hey!").
- Opt-out language on the first message to a contact ("Reply STOP to opt out").
- Every fact verified. Prices, discounts, dates, times, addresses and hours all match reality.
- No all-caps words, stacked "!!!" or "act now" urgency.
- No public shorteners. Use your own domain or a full URL.
- Content matches your registered campaign. A reminder campaign shouldn't send promos, and SHAFT content needs the right registration. If a campaign was rejected over sample messages, this sample-message rewrite guide shows what carriers want to see.
- Segment count checked. No emoji unless you've decided it's worth tripling the cost.
- Spam-filter check run and its flags fixed or consciously accepted.
Most problems in AI copy fall under items 3 and 4. If you're in ecommerce, the content signals that get promos filtered goes deeper on item 4.
Generating copy inside your own product
If you run a platform that texts on behalf of your customers, you may want to generate copy with your own model and send it through an API. That works on Ready. Your code writes the draft, a person (or your own rules) reviews it, and the send goes through the messages endpoint with an Idempotency-Key header so a retry never sends twice:
POST https://api.tryready.com/v1/messages
X-API-Key: <key>
Idempotency-Key: <any UUID>
{"to": "+12125550199", "body": "Bright Dental: your cleaning is Tue at 9 AM. Reply C to confirm or STOP to opt out.", "consent_attested": true}Opt-outs, numbers on your Ban list and known landlines are refused up front and not charged, and a text sent during the recipient's quiet hours is held only if the window opens within 6 hours, otherwise it is refused and your system has to resend it. A held text is charged only when it actually sends. The full reference is at docs.tryready.com/api/messages.
If an AI agent (Claude, ChatGPT, Cursor and similar) needs to send texts directly, Ready's MCP server lets it do that with a test key that simulates sends while you build. We cover the guardrails in SMS MCP server: let AI agents send texts safely.
The practical takeaway
An AI text message generator is worth using. It gets you from blank page to decent draft faster than anything else. Treat its output as a first draft from a confident intern: fluent, quick, and occasionally wrong in ways that matter. Constrain the prompt (sender name, under 155 characters, no emoji, opt-out line, no invented offers), verify every fact, run a spam-filter check and look at the segment count before you send.
If you want to try Ask AI's drafts and spam check on your own copy, sign up for Ready. The first 20 texts are free one-to-one sends (a card on file is required to send), so use them to test drafts before you pay for registration.
FAQ
What is an AI text message generator?
It's a tool that writes SMS copy from a short brief, such as an appointment reminder, promo or follow-up. It's useful for drafts and variations, but its output needs a human check for accuracy, opt-out language and filter-prone phrasing before it's sent.
Will AI-written texts get filtered by carriers?
They can. Carriers filter on content, and AI defaults to urgency phrases, all-caps, exclamation points and link shorteners, all of which are common filter triggers. Editing those out and running a spam-filter check lowers the risk, but nothing guarantees delivery.
Does Ready's AI reply to my customers automatically?
Not on a new account. Ready no longer lets accounts create AI reply agents, though one set up earlier may still answer texts until you pause its automation in Automations. Ready's AI writes and checks outbound messages, and the in-app assistant helps you run your account. On a new account, inbound replies land in your Inbox for a person to answer.
Do emoji in AI-generated texts cost more?
Often, yes. One emoji switches a message to unicode, which drops a segment from 160 characters to 70 (67 per segment when split). A 175-character text with an emoji becomes 3 billed segments instead of 2, at $0.0075/segment plus the $0.0045 carrier fee each on Ready's Standard rate.
Do I still need 10DLC registration if AI writes my texts?
Yes. Who wrote the copy doesn't change carrier requirements. Business texting over standard numbers needs brand and campaign registration, and the content you send should match the campaign you registered. On Ready, registration is handled in-app and most approvals take 2 to 7 days.