Plain-terms companion to integration-architecture.md: Automation Hub as the
internal action warehouse, Tool Hub as the smart front desk (progressive
disclosure + per-user permission filtering + audit) running as a central
service, and where the MCP Gateway (Arcade, per-user OAuth for outside tools)
and AI Gateway (config-only model toll booth) plug into existing seams.
Source-verified against servicetitan/tool-hub + automation-hub @ master.
Tejus Rachakonda
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