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Corey Haines d36433703b feat: add sms skill + 5 SMS platform integration docs (#307 )

New skill: skills/sms/
- SKILL.md (336 lines, under 500 limit): strategy, when SMS beats email,
  compliance overview, sequence types, copy guidelines, platform selection,
  measurement, common mistakes
- references/compliance.md: TCPA, A2P 10DLC, EU GDPR, CASL, Australia,
  opt-in disclosure templates, STOP/HELP response templates, audit checklist
- references/sequence-templates.md: full copy templates with character
  counts for welcome, abandoned cart, browse abandonment, post-purchase,
  win-back, promotional, transactional, re-engagement, replenishment, VIP
- references/platforms.md: platform deep-dives across Klaviyo SMS,
  Postscript, Attentive, Twilio, Plivo, AudienceTap, Brevo, SimpleTexting,
  Customer.io
- evals/evals.json: 6 evals covering getting started, abandoned cart,
  TCPA compliance, opt-out diagnosis, A2P throughput, emoji segment cost

New integration docs:
- tools/integrations/twilio.md
- tools/integrations/postscript.md
- tools/integrations/attentive.md
- tools/integrations/plivo.md
- tools/integrations/audiencetap.md

Registry + marketplace wiring:
- tools/REGISTRY.md: 5 new entries + new SMS / Messaging category section
- .claude-plugin/marketplace.json: bumped to 2.1.0, SMS added to plugin description
- VERSIONS.md: sms 1.0.0 + 2.1.0 changelog entry
- README.md: skill table re-sorted via sync-skills.js, sms added to ASCII flow

All 41 skills pass validation. sync-skills.js is idempotent on current state.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

2026-05-21 16:44:47 -07:00

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Postscript

SMS marketing platform built for Shopify direct-to-consumer brands. Deepest Shopify integration of any SMS platform.

Capabilities

Integration	Available	Notes
API	✓	REST API
MCP	-	Not available
CLI	-	None
SDK	-	Use API directly

Authentication

Type: API Key
Header: Authorization: Bearer {api_key} or X-Postscript-Api-Key: {api_key}
Get key: Postscript dashboard → Settings → API
Note: Keys are scoped per shop

Common Agent Operations

Search subscribers

GET https://api.postscript.io/api/v2/subscribers?phone_number=%2B15551234567

Create subscriber (opt-in)

POST https://api.postscript.io/api/v2/subscribers

{
  "phone_number": "+15551234567",
  "email": "user@example.com",
  "first_name": "Jane",
  "subscribed_at": "2026-05-15T10:00:00Z",
  "opt_in_source": "checkout_keyword"
}

Must include valid opt-in metadata for TCPA compliance.

Unsubscribe

DELETE https://api.postscript.io/api/v2/subscribers/{subscriberId}/subscription

List keywords (e.g., JOIN, SAVE)

GET https://api.postscript.io/api/v2/keywords

Send transactional message

POST https://api.postscript.io/api/v2/transactional/sms

{
  "phone_number": "+15551234567",
  "message": "Your order #1234 shipped. Track at https://..."
}

Transactional requires separate enablement; counts under transactional consent.

List campaigns

GET https://api.postscript.io/api/v2/campaigns

List automations (flows)

GET https://api.postscript.io/api/v2/automations

Webhooks

Subscribe to events: subscriber.created, subscriber.unsubscribed, message.delivered, message.failed, conversion.attributed.

API Pattern

REST + JSON. Standard Bearer auth. Pagination via cursor and limit (max 100).

Key Features

Native Shopify integration: purchases, abandoned carts, browse, product catalog auto-sync
Strong abandoned cart and browse abandonment automation builders
AI Reply (auto-reply trained on brand voice)
Conversational SMS / live agent for two-way
Opt-in tools: popups, keyword opt-in, checkout opt-in
A2P 10DLC managed in-platform
Reporting: revenue, click-through, conversion attribution, opt-out rate

Pricing

Plans: Starter (free, 1K msgs/mo), Growth ($100+/mo), Professional, Enterprise
Per-send pricing on top: ~$0.015 SMS, ~$0.04 MMS
Annual contracts standard at Growth+
Pricing scales meaningfully past 50K subscribers

When to Use

Shopify DTC brand wanting SMS-specific tooling (vs combined email/SMS)
Need deep abandoned cart, browse abandonment, post-purchase automation out of the box
Want managed A2P 10DLC + compliance tools
Mid-size DTC brand (10K–500K SMS subscribers)

When NOT to Use

Non-Shopify ecom — integration is shallow
Already on Klaviyo for email and SMS is secondary — Klaviyo SMS is simpler
Mid-market/enterprise needing concierge support — Attentive
Custom platform or B2B SaaS — Twilio

Relevant Skills

sms
emails (run alongside via Klaviyo or similar)
churn-prevention (win-back flows)
onboarding (post-purchase activation)

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