The honest version of "does it integrate with my software." These are the systems this industry actually runs on, and what each one means for a build.
ProcoreProject management
The system of record on most commercial work — drawings, RFIs, submittals, daily logs, change orders, and increasingly the financials. It has a real API and a permission model, which makes it the natural place for an agent to read and write, and the natural place to hit the question of what a vendor account is allowed to see.
Autodesk Build / ACCProject management
The other side of the market, strong where the design team is already in Autodesk. Similar shape for integration purposes; the differences that matter are in how issues and submittals are modeled, not in whether you can reach them.
Sage 300 CRE / Foundation / ViewpointConstruction accounting
Job cost, AIA billing, retainage and payroll. These are where the actual profitability lives and they rarely agree with the project management platform without someone reconciling them. Integration ranges from good to a nightly file, so this is the end to verify before scoping.
Textura / GCPaySubcontractor payment and compliance
Where lien waivers and sub payment applications flow on larger projects. Where it is in use it owns the waiver workflow; where it is not, that workflow is email and a spreadsheet, which is the version an agent helps most.
Certificate trackingInsurance compliance
Sometimes a dedicated service, more often a folder of PDFs and a spreadsheet. Either way the underlying job — read the certificate, check it against what the subcontract actually requires, chase the agent for a corrected one — is manual almost everywhere.
BluebeamDrawings and markup
Where takeoffs, markups and much of the document review actually happen. Less an integration target than a source of PDFs that other agents read.
Egnyte / SharePointDocument storage
The project file. Usually the real answer to "where is that document," and usually organized by convention rather than by structure — which makes it readable but means an agent needs the naming convention explained to it.
Building Connected / SmartBidBid management
Invitations, bid packages and subcontractor coverage. The place preconstruction chases responses from, and a natural home for follow-up.
Payroll and certified payrollPayroll
On public work, certified payroll reporting is a weekly recurring document with penalties attached to getting it wrong. Frequently produced by hand from timecards even where payroll itself is automated.