Key Takeaways
- MCP vs REST is how your agent calls the Android SMS gateway — not a different SMS network.
- MCP tools wrap the same HTTPS/JSON. Keys stay in env. Never echo OTP.
- Prefer REST for tight services; MCP when an IDE/agent host needs tool calls.
- This page is prompt + decision table. Live fields live in Developer Center. No MCP source dump.
- Phones, pairing, and operator airtime still dominate reliability.
- You bring the Android and operator credit. We meter devices and send volume.
Interface choice, same radio
MCP server vs REST API — example agent prompt helps the model explain (and choose) the interface without inventing a new SMS product. Overview: MCP overview. API cornerstone: Android SMS Gateway API.
MCP does not make the phone faster. It makes the agent able to call the same send you already had over HTTPS.
Example agent prompt
“Explain MCP as a tool wrapper over our REST gateway. Do not claim MCP replaces devices or airtime. Prefer REST for backend services; MCP for IDE/agent hosts. Keys in env. Never echo OTP. list_devices before send.” Spec: MCP specification. Fields: Developer Center.
MCP vs REST
| Dimension | REST | MCP tools |
|---|---|---|
| Caller | Your service / SDK-less HTTPS | Agent host (Cursor, Claude Desktop, …) |
| Contract | Paths + JSON fields | Tool names + args → same paths |
| Secrets | Env / vault in app | Env injected into MCP process |
| Radio | Paired Android | Same paired Android |
When to prefer which
Production OTP backends usually stay on REST (or both: REST core + MCP for ops assistants). Do not let an agent invent endpoints — confirm in Developer Center.
Cost
You bring the Android and operator SMS credit. Interface choice does not change metering. Free: 1 device / 300 SMS lifetime / 300 contacts. See device and SMS volume pricing.
Checklist
- No “MCP replaces REST” claim.
- No plugin SKU claim.
- Keys in env.
- OTP never in chat.
- list_devices before send.
- Developer Center for live fields.
- No MCP source dump.
- Pricing = devices + volume + BYO airtime.
Next steps
No-code contrast: MCP vs Zapier prompt. Primer: What is MCP for SMS.
Related product pages
Jump to the live product docs for this topic—not another long-form article.
- SMS API documentationLive endpoint reference
- device and SMS volume pricingPlans and allowances
- Twilio vs Android SMS gatewayCloud vs own-SIM cost model
- Android SMS gateway product guideDefinition, product, and how to buy
