Build vs Buy: The AI Agent Decision Tree for SMBs
Should you build a custom AI receptionist or use an off-the-shelf platform? The answer depends on three variables.
The Three Variables
1. Call or chat volume per month.
2. Domain specificity (your business jargon, products, exceptions).
3. Required integrations (your CRM, calendar, telephony stack).
Off-The-Shelf Wins If
Volume is under 500 interactions per month, domain is generic (basic booking, FAQ), and integrations are standard. Platforms like PolyAI, Synthflow, Air, Vapi cover this well.
Custom Build Wins If
Volume is over 1,500 interactions per month, domain is specific enough that off-the-shelf agents misroute, or you need integrations with niche platforms (DMS, EHR, vertical-specific software).
The Hybrid Approach
We often build a custom orchestration layer (Claude + Twilio + workflow engine) on top of off-the-shelf voice and transcription services. Best of both: domain control with managed infrastructure.