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Agent skill

Sms

by coreyhaines31 in coreyhaines31/marketingskills

When the user wants to plan, build, or optimize SMS, MMS, or WhatsApp marketing — including welcome flows, abandoned cart texts, post-purchase, win-back, promotional sends, or transactional/auth SMS.

MITAuto-check passedMarketing & SEO

Install Sms

skills CLI
$ npx skills add coreyhaines31/marketingskills --skill sms -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install coreyhaines31/marketingskills sms --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/coreyhaines31/marketingskills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/sms .claude/skills/sms && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
sms
GitHub stars
54k
Used in
1 other repo
Token cost
~4.6k tokens
SKILL.md length
2,177 words
Files
6 (incl. references)
Skills in repo
21
Repo updated
First seen
Licence
MIT

At a glance

When the user wants to plan, build, or optimize SMS, MMS, or WhatsApp marketing — including welcome flows, abandoned cart texts, post-purchase, win-back, promotional sends, or transactional/auth SMS.

  • Works in 10 steps: Business Type → Current State → Compliance Posture → …
  • WhatsApp marketing — including welcome flows
  • SKILL.md covers Before Starting, When SMS Beats Email, WhatsApp and Compliance — Read First, plus 4 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Sms is an agent skill from coreyhaines31/marketingskills. When the user wants to plan, build, or optimize SMS, MMS, or WhatsApp marketing — including welcome flows, abandoned cart texts, post-purchase, win-back, promotional sends, or transactional/auth SMS. Also use when the user mentions "SMS marketing," "text message campaigns," "SMS sequence," "SMS automation," "abandoned cart text," "post-purchase SMS," "Klaviyo SMS," "Postscript," "Attentive," "Twilio," "A2P 10DLC," "TCPA," "SMS compliance," "short code," "toll-free SMS," "MMS campaign," "should I do SMS," "SMS vs…

Its SKILL.md is about 4.6k tokens, which your agent loads only when the skill is triggered. The skill folder holds 7 other files, including reference files (for example `evals/evals.json`, `references/compliance.md` and `references/platforms.md`).

It sits in Marketing & SEO, covering Email marketing, Messaging and chat bots and Copywriting. It works with WhatsApp and Twilio. The repository describes itself as: Marketing skills for Claude Code and AI agents. CRO, copywriting, SEO, analytics, and growth engineering. The licence is MIT.

When your agent uses it

  • WhatsApp marketing — including welcome flows
  • Abandoned cart texts
  • Promotional sends
  • Transactional/auth SMS

Example prompts

  • “SMS marketing,”
  • “text message campaigns,”
  • “SMS sequence,”
  • “/sms”

Workflow steps

10 steps, taken from the step headings in SKILL.md.

  1. Business Type
  2. Current State
  3. Compliance Posture
  4. Goal
  5. Every send has a real cost
  6. Opt-in is your most valuable asset
  7. Each message must justify itself
  8. Brevity + clarity
  9. One CTA, one link
  10. Sender identity, every send

What it can do on your machine

Read from SKILL.md and the folder at commit b9ba399. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Sms loads about 4.6k tokens when it runs, and up to ~15k if it reads all its reference files. Until then it costs about 188 tokens; SKILL.md has 2,177 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~188
When it runs · the whole SKILL.md, loaded when a task matches
~4.6k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~15k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from coreyhaines31/marketingskills at commit b9ba399, republished under its MIT licence (© coreyhaines31). 2,177 words, ~4,574 tokens.

Download SKILL.mdSave it as .claude/skills/sms/SKILL.md (or your agent's skills folder). This skill also uses 5 other files; get the full folder from GitHub.
name
sms
description
When the user wants to plan, build, or optimize SMS, MMS, or WhatsApp marketing — including welcome flows, abandoned cart texts, post-purchase, win-back, promotional sends, or transactional/auth SMS. Also use when the user mentions "SMS marketing," "text message campaigns," "SMS sequence," "SMS automation," "abandoned cart text," "post-purchase SMS," "Klaviyo SMS," "Postscript," "Attentive," "Twilio," "A2P 10DLC," "TCPA," "SMS compliance," "short code," "toll-free SMS," "MMS campaign," "should I do SMS," "SMS vs email," "WhatsApp marketing," "WhatsApp Business API," "WhatsApp templates," or "click-to-WhatsApp." For email sequences, see emails. For SMS copy framing, see copywriting. For opt-in popups that capture phone numbers, see popups.
metadata.version
1.1.0

SMS Marketing

You are an expert in SMS and MMS marketing for direct-to-consumer brands, mobile apps, and SaaS products with high-engagement use cases. Your goal is to help plan, build, and optimize SMS programs that drive measurable revenue or activation while staying fully compliant with TCPA and carrier rules.

Before Starting

Check for product marketing context first: If .agents/product-marketing.md exists (or .claude/product-marketing.md, or the legacy product-marketing-context.md filename, in older setups), read it before asking questions. Use that context and only ask for information not already covered or specific to this task.

Gather this context (ask if not provided):

1. Business Type
  • B2C ecom / DTC, B2B SaaS, mobile app, services, fintech
  • Order volume or list size (SMS economics depend on scale)
  • Geographic mix (US, EU, both — compliance differs dramatically)
2. Current State
  • Existing SMS program (platform, list size, opt-in rate, opt-out rate, revenue/send)
  • Email program (SMS works best as a layer on top, not a replacement)
  • Phone number type: short code, toll-free, long code (10DLC)
3. Compliance Posture
  • US: A2P 10DLC registration complete? (Required since 2022 — without it, your messages get filtered)
  • Opt-in mechanism in use? (Checkbox, keyword opt-in, double opt-in)
  • Privacy policy + terms include SMS disclosures?
4. Goal
  • Drive revenue (promotional, cart recovery, post-purchase)
  • Drive activation (welcome, onboarding, milestone nudges)
  • Transactional (order updates, auth codes, alerts)

When SMS Beats Email

SMS is not "another email." Use it where the channel's properties win:

Use CaseSMS or Email?Why
Abandoned cart recoverySMS first98% open rate within 3 min vs 20% for email in 24h
Order/shipping updatesSMSCustomers want it now, on their phone
Flash sale / limited dropSMSUrgency channel; immediate read
Auth codes / 2FASMS (or app)Latency-sensitive, must arrive in seconds
Welcome seriesEmail primary, SMS layerEmail carries the long-form content
Educational nurtureEmailToo much text for SMS, costs add up
NewsletterEmailWrong channel for SMS
Win-back lapsed customersBothSMS for the strong nudge, email for the offer detail
Post-purchase upsellSMSHigh open rate, ride the purchase momentum

General rule: SMS earns the right to interrupt because of opt-in. Use it for messages that genuinely benefit from immediacy. If it could wait 24 hours, send it via email.

WhatsApp

If most customers are outside the US (LATAM, Europe, Africa, Middle East, India, Southeast Asia), WhatsApp often beats SMS for the same flows. It runs on different rules:

  • 24-hour window: free-form messages only within 24 hours of the customer's last message. Outside it, send a Meta-approved template.
  • Template categories: marketing, utility, authentication. Cart reminders and anything promotional are marketing.
  • Per-message pricing (since July 2025): every marketing template is charged. From October 2026, service replies and in-window utility messages are charged too.
  • Quality rating and messaging limits: blocks and reports lower your rating and can shrink how many people you can message per day.
  • US caveat: Meta currently doesn't deliver marketing templates to US numbers. Keep SMS for US marketing.

For the 24-hour window, templates, opt-in, quality and tiers, pricing, click-to-WhatsApp ads, and WhatsApp playbooks: see references/whatsapp.md.

Compliance — Read First

Compliance is the foundation, not an afterthought. A single TCPA class-action settlement runs $5M–$40M. The basics:

US — TCPA (Telephone Consumer Protection Act)
  1. Express written consent required for marketing SMS. Implied consent doesn't count.
  2. Clear disclosure at opt-in must include: program name, frequency expectation ("up to 4 msgs/month"), STOP/HELP instructions, "Msg & data rates may apply," link to terms.
  3. Honor STOP/UNSUBSCRIBE within seconds, every time, no exceptions, on every keyword variant (STOP, END, CANCEL, UNSUBSCRIBE, QUIT).
  4. Honor HELP with a response containing brand name + STOP info + support contact.
  5. Quiet hours: no marketing sends before 8am or after 9pm in the recipient's local time. Carrier rules and state laws (e.g., Florida, Oklahoma, Washington) are stricter than federal — default to 9am–8pm recipient-local.
  6. Keep written consent records with timestamp, opt-in source, and exact disclosure text shown. Auditable.
US — A2P 10DLC Registration (required since 2022)

Application-to-Person 10-digit long codes must be registered through The Campaign Registry (TCR) via your SMS platform. Without registration:

  • Throughput is throttled (or zero)
  • Carriers filter your messages
  • You'll see "delivered" status but recipients won't get them

Registration covers: brand identity verification, campaign use case (marketing, account notification, OTP, etc.), sample messages, opt-in mechanism, opt-out language. Sample message text from registration must match what you actually send.

  • Explicit opt-in required (no pre-checked boxes)
  • Right to withdraw consent must be as easy as giving it
  • Data subject access requests apply to SMS records
  • ePrivacy Directive layered on top of GDPR
Canada — CASL
  • Express consent + sender identification + unsubscribe in every message
  • Implied consent allowed for existing business relationships within 24 months
  • Penalties up to CAD $10M per violation

For full compliance details, edge cases, opt-in copy templates, and STOP/HELP response templates: see references/compliance.md.

Phone Number Types (US)

TypeThroughputCostUse CaseTrust
Short code (5-6 digit)100+ msg/sec$500–$1,000/mo + setupHigh-volume marketingHighest (carrier-vetted)
Toll-free (1-8XX)~3 msg/sec$10–$30/moMid-volume, B2C supportMedium-high (carrier-verified)
10DLC (regular long code)1–250 msg/sec$2–$10/moSMB, conversational, transactionalMedium (requires A2P 10DLC reg)

Rule of thumb: list <10K = 10DLC. List 10K–100K = toll-free. List 100K+ = short code.

Core Principles

1. Every send has a real cost

SMS isn't free. At $0.0075–$0.04 per send + carrier fees, a 100K send costs $750–$4,000. This forces relevance — you can't "blast." Segment hard.

2. Opt-in is your most valuable asset

Opt-in rate from email → SMS is typically 5–25%. A high-quality SMS list of 10K beats a low-quality list of 100K. Optimize opt-in quality, not volume.

3. Each message must justify itself

The recipient gave you their phone number. Every send should pass: "would I be glad I got this text?" If no, don't send.

4. Brevity + clarity

160 GSM-7 characters = 1 SMS segment. 161+ chars = 2 segments (you're billed for 2). Emojis force UCS-2 encoding (70 chars per segment). Plan for segment count.

Short links are mandatory (klvy.co, txt.attn.tv, branded short domain). Track UTM params on every link.

6. Sender identity, every send

"From [Brand]:" or branded short code at the start of every message. Even on automated flows. Recipients can't see "from" address — they need it inline.

SMS Sequence Types

Welcome / Opt-In Confirmation (immediate)

Send 1: Confirmation + reward (immediate)

From Acme: Thanks for joining! Here's 10% off: ACME10. Use at checkout: acme.co/sale. Reply STOP to opt out.

Optional Send 2 (24h later): Reminder + best-seller showcase

Abandoned Cart (highest-ROI flow for ecom)
  • Send 1 (30 min after abandon): "Forget something? Your cart's still here: [short link]"
  • Send 2 (4 hours later): Soft urgency + social proof
  • Send 3 (24 hours later, optional): Discount offer (only if margin allows)

Note: Discount on first message trains customers to abandon. Reserve discount for Send 2 or 3.

Browse Abandonment
  • Send 1 (1 hour after browse): Product + "Thinking it over?" + link
Post-Purchase
  • Send 1 (immediate): Order confirmation + delivery ETA (transactional, separate consent OK)
  • Send 2 (after delivery + 2 days): "How are you liking [product]?" + review prompt + cross-sell
Win-Back (lapsed)
  • Send 1 (60–90 days after last purchase): "We miss you" + curated picks
  • Send 2 (14 days later): Discount offer
  • Send 3 (final, 14 days later): Opt-out warning + last chance
Promotional / Campaign Sends
  • Flash sales, drops, launches, BFCM
  • 1–2 sends max per campaign
  • Stack against email send schedule to avoid same-day double-tap
Transactional (separate compliance bucket)
  • Order updates, shipping, delivery, auth codes, account alerts
  • Generally OK without separate marketing consent if directly related to a transaction the user initiated
  • Still subject to A2P 10DLC registration in US

For full sequence templates with copy and timing: see references/sequence-templates.md.

SMS Copy Guidelines

Structure
  1. Sender ID ("From Acme:" or brand short code) — required
  2. Hook — first 5 words decide if they read on
  3. Value — what's in it for them, specifically
  4. CTA + short link — single action, single URL
  5. Compliance footer — "Reply STOP to opt out" (required on opt-in confirmation and at least quarterly thereafter; carrier-recommended on every promotional message)
Show full SKILL.md (857 more words)Show less
Length
  • 160 chars (GSM-7) = 1 segment. Aim here.
  • 70 chars (UCS-2) if you use emojis, accented characters, or curly quotes — you'll pay for more segments.
  • 161–306 chars = 2 segments (concatenated SMS). Acceptable for richer messages, but you're paying double per send.
  • MMS (image + up to 1,600 chars) = 3–5× the SMS cost. Use sparingly for high-impact moments.
Voice
  • Conversational, not corporate. SMS feels personal — write like you're texting a friend.
  • No subject line, no formatting, no marketing-speak.
  • Emojis are fine in moderation (one per message, situationally).
  • ALL CAPS reads as shouting. Avoid except for explicit codes (e.g., "Use ACME10").
Personalization
  • First name token if available (boosts CTR ~20%)
  • Recent product/category browse-based
  • Location-based offers (where applicable)
  • Don't fake intimacy ("Hey friend!") — it backfires

For complete copy patterns by sequence type with character counts: see references/sequence-templates.md.

Platform Selection

PlatformBest ForNative MCPCost Tier
Klaviyo SMSDTC ecom already on Klaviyo email✓$$
PostscriptDTC Shopify ecom, deep integration-$$
AttentiveMid-market+ ecom, full-service-$$$
TwilioCustom builds, transactional, devs-$ (raw API)
Brevo SMSEU-focused, email + SMS combo✓$
SimpleTextingSMB, simple needs, ease of use-$
Customer.ioBehavior-based automation + SMS-$$

Quick picks:

  • Already on Klaviyo for email + DTC/ecom → Klaviyo SMS (no second platform to learn)
  • Shopify ecom, want deeper SMS-specific features → Postscript
  • Building custom SMS into a product → Twilio
  • B2B SaaS doing transactional/auth → Twilio or Customer.io

For platform deep-dives (features, pricing, integration paths, A2P registration): see references/platforms.md.

Measurement

Key Metrics
MetricWhat it tells youHealthy range (ecom DTC)
Opt-in rateTop of funnel health5–25% of email subscribers
CTRMessage relevance8–15% (vs ~3% email)
Conversion rate (per send)Revenue impact1–5% per promotional send
Revenue per send (RPS)Channel economics$0.20–$2.00
Opt-out rate per sendAudience fatigue<2% per send, <0.5% for promotional
Cost per sendChannel cost discipline$0.0075–$0.04
List growth rateAudience momentum5–15%/month early, 1–3% steady-state
What to track in analytics
  • UTM tag every link: utm_source=sms&utm_medium=sms&utm_campaign=[campaign-name]
  • Conversion attribution: SMS-driven sessions, last-click revenue, assisted conversions
  • LTV impact: SMS subscribers vs email-only subscribers (typically 1.5–3× LTV for SMS opt-ins)
What to A/B test
  • Send time (afternoon vs evening, local time)
  • Copy length (short SMS vs MMS with image)
  • Discount amount and trigger (immediate vs delayed)
  • Personalization tokens (with first name vs without)
  • CTA copy ("Shop now" vs "See it" vs "Last chance")

Cross-reference ab-testing skill for proper test design and analytics for attribution setup.

Output Format

When the user asks for an SMS plan, return:

  1. Compliance check: Are they registered for A2P 10DLC (if US)? Is the opt-in mechanism compliant? Flag blockers first.
  2. Strategy: Which SMS flows to build first, ranked by ROI for their business model.
  3. Sequence designs: For each priority flow, specify trigger, delay, copy with character counts, CTA, segmentation.
  4. Platform recommendation: Based on stack, list size, and complexity.
  5. Measurement plan: KPIs, benchmarks, A/B test queue.
  6. Compliance footer: Required disclosures, STOP/HELP response templates.

Keep recommendations specific. Don't say "send an SMS at the right time" — say "send 30 min after cart abandon, 4 hours later if no purchase, 24 hours later with discount."

Task-Specific Questions

  1. Are you US, EU, or both? (Changes compliance approach entirely.)
  2. Is A2P 10DLC registration complete (US)?
  3. What platform are you on or considering?
  4. Email list size and SMS opt-in rate (if any)?
  5. What sequences do you already have running?
  6. Are you DTC ecom, mobile app, B2B SaaS, services?
  7. What's the primary goal: revenue, activation, retention, or transactional?

Common Mistakes

  1. Skipping A2P 10DLC registration — your messages get filtered into oblivion. Register first, send second.
  2. Treating SMS like email — sending daily promotional blasts. Opt-out rates spike, list dies.
  3. Discount on first abandoned cart message — trains customers to always abandon. Reserve for second or third send.
  4. Generic "From: [shortcode]" — recipients need brand name in the message itself.
  5. Forgetting quiet hours — sending at 6 AM local time gets opt-outs and TCPA complaints.
  6. No STOP/HELP handling — non-negotiable. Every platform handles this; verify yours does.
  7. Emojis everywhere — pushes you into UCS-2 encoding, halves segment size, doubles cost.
  8. Mismatching A2P sample messages and actual sends — carriers flag and block.
  9. Not tracking conversions — you can't justify channel ROI without attribution.
  10. No throttling on bulk sends — burst sends trigger carrier filtering. Use platform throttling.

Tool Integrations

For implementation, see the tools registry. Key SMS tools:

ToolBest ForMCPGuide
KlaviyoE-commerce email + SMS combined✓klaviyo.md
PostscriptShopify DTC SMS, deepest Shopify integration-postscript.md
AttentiveMid-market+ DTC SMS, full-service-attentive.md
TwilioRaw API for custom builds, transactional, dev-first-twilio.md
PlivoTwilio alternative, lower per-send cost-plivo.md
AudienceTapAI-forward DTC, on-pack QR opt-in-audiencetap.md
BrevoEU email + SMS, SMB-friendly✓brevo.md
Customer.ioBehavior-based SMS automation-customer-io.md
  • emails: Sister channel — almost always run together. Email carries the long-form content; SMS carries the urgent nudges.
  • copywriting: For SMS copy at scale and the longer-form pages/emails that SMS links to.
  • popups: For phone number capture popups on-site.
  • churn-prevention: For win-back flows that combine SMS + email.
  • onboarding: For post-signup SMS milestone nudges.
  • analytics: For attribution and RPS measurement.
  • ab-testing: For SMS-specific test design.
  • lead-magnets: For incentivizing opt-in (the "10% off for joining" offer).

© coreyhaines31, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 5 other files (references) in skills/sms of coreyhaines31/marketingskills.

  • SKILL.md
  • evals/evals.json
  • references/compliance.md
  • references/platforms.md
  • references/sequence-templates.md
  • references/whatsapp.md

Open the folder on GitHubat commit b9ba399

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in coreyhaines31/marketingskills, which our catalogue first saw on October 8, 2026.

Compare with similar skills

Sms next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Sms compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Sms this skillcoreyhaines31/marketingskills54k1 repos~4.6kAutomated safety check: PassMIT
Marketing Growthinfometa/workbuddyskills344—~956Automated safety check: PassNone
Marketing OsYuzzyuk/marketing-os536—~2.5kAutomated safety check: PassMIT
Autoresearchericosiu/ai-marketing-skills3.6k2 repos~2.2kAutomated safety check: PassMIT
Marketing Campaignsanthropics/commerce-agents3.2k—~1kAutomated safety check: PassApache-2.0
Marketing Campaignaffaan-m/ECC275k1 repos~1.3kAutomated safety check: PassMIT

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Works with

Categories

Questions about Sms

What does Sms do?

When the user wants to plan, build, or optimize SMS, MMS, or WhatsApp marketing — including welcome flows, abandoned cart texts, post-purchase, win-back, promotional sends, or transactional/auth SMS. Sms is an agent skill from coreyhaines31/marketingskills. When the user wants to plan, build, or optimize SMS, MMS, or WhatsApp marketing — including welcome flows, abandoned cart texts, post-purchase, win-back, promotional sends, or transactional/auth SMS.

When should I use Sms?

Sms fits situations like: whatsApp marketing — including welcome flows; abandoned cart texts; promotional sends; transactional/auth SMS.

How do I install Sms in Claude Code?

Run `npx skills add coreyhaines31/marketingskills --skill sms -a claude-code`. Or copy the skill folder (skills/sms in coreyhaines31/marketingskills) into .claude/skills/sms in your project. Claude Code loads it when a task matches its description.

How do I install Sms in Codex?

Run `npx skills add coreyhaines31/marketingskills --skill sms -a codex`. Or copy the skill folder (skills/sms in coreyhaines31/marketingskills) into .agents/skills/sms in your project. Codex loads it when a task matches its description.

Can I use Sms in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add coreyhaines31/marketingskills --skill sms -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/sms, .gemini/skills/sms, .github/skills/sms and .opencode/skills/sms in your project.

What does Sms need to run?

SKILL.md names no scripts, command-line tools or credentials: Sms is instructions for the agent only.

Does Sms access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Sms safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Sms use?

Sms is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Sms use?

About 4.6k tokens (SKILL.md is roughly 18k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 10k tokens, read only when the agent opens those files.

What are the alternatives to Sms?

Skills that share tags, products or a category with Sms: Marketing Growth (infometa/workbuddyskills, 344 stars), Marketing Os (Yuzzyuk/marketing-os, 536 stars), Autoresearch (ericosiu/ai-marketing-skills, 3.6k stars) and Marketing Campaigns (anthropics/commerce-agents, 3.2k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Sms?

coreyhaines31 (a GitHub user) maintains it in coreyhaines31/marketingskills, which has 53,618 GitHub stars. The repository holds 21 skills in this directory. The repository was last updated on October 8, 2026.

Source: coreyhaines31/marketingskills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.