SMS Assist

SMS Assist (rebranded as Lessen) is a facilities maintenance, repair, and work-order management company. Its "One" Platform coordinates reactive and recurrent maintenance, turn/renovation projects, invoices, proposals, assets, and a nationwide vendor network for residential and commercial properties. Lessen exposes the platform through the One Open API v2 — a GraphQL API split into a Client surface (property owners/managers create and track work orders, residents, locations, invoices, and Turn/Reno projects) and a Vendor surface (affiliate technicians manage assets, communications, and work orders) — plus a rich webhook event catalog, SSO/SCIM provisioning, and isolated sandbox and production environments. The legacy REST Open API v1 and Affiliate API v1 were sunset in favor of the v2 GraphQL platform.

Kin Score

This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.

How we profile SMS Assist

Each block below is one kind of artifact we hold for SMS Assist. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.

APIs 2

Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.

Individual APIs this provider publishes, each with its own machine-readable definition.

One Open API v2 - Client

GraphQL API for clients (property owners and managers) to create and track reactive and recurrent work orders, residents, locations, service requests, invoices, proposals, Turn/...

One Open API v2 - Vendor

GraphQL/HTTP API for vendors and affiliate technicians to manage assets (service and location assets), attachments, communications and messages, client lists, employees, locatio...

MCP Servers 1

Model Context Protocol servers expose these APIs directly to AI agents. We profile them because agent-native access is the fastest-growing way this provider's capabilities actually get used.

Model Context Protocol servers that expose these APIs to AI agents.

sms-assist-mcp.yml

MCP SERVER

Event Specifications 1

Not every API is request/response. AsyncAPI describes the event-driven and streaming side — the webhooks and channels — so the asynchronous half of the interface is documented the same way the synchronous half is.

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Sms Assist Webhooks

ASYNCAPI

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Sms Assist Authentication

http/oauth2 · 2 schemes

SECURITY

Sms Assist Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Every other property we hold for SMS Assist — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.

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