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Local trades and home servicesGrok Bot

Have Grok Bot run a subcontractor’s back office: invoices, inboxes, timesheets and contract review

Picked and checked by Olga Pearson, host of The Practical AI Show · Published

Result

self-reported

Four days in, Grok Bot was filing and printing vendor invoices, sweeping 3 inboxes, prepping ClockShark timesheets, reviewing contracts and catching vendor pricing misses. They’ve since tested AI takeoffs on 3 past bids and now use it for spec and plan reviews and RFIs before they bid.

Monica Thomas co-owns a commercial interiors subcontractor (drywall, framing, ceilings, flooring). They had no plan reviews before, so even with their own estimators doing takeoffs, an agent that reviews specs and plans and drafts RFIs before a bid is a big deal. They’re now comparing old estimates with the crew hours actually logged, so the estimating bot can flag a bid that looks light before it goes out.

Who did it

Monica Thomas (@mthomas_99og)Commercial interiors subcontractor (drywall, framing, ceilings, flooring)Monica Thomas on X · Oct 10, 2026

Try it now

  1. Connect Grok Bot to your office inboxes, your accounting system and your timesheet app (ClockShark or similar).
  2. Have it file vendor invoices, check each price against the PO or quote, and flag any mismatch.
  3. Have it prep timesheets for payroll and list anything missing before the deadline.
  4. Give it every new contract and spec set: it lists risky clauses, scope gaps and questions for an RFI.
  5. Compare past estimates with the crew hours you actually logged, so it can flag a bid that looks light.
Copy-paste prompt
You are the back-office assistant for [company], a [trade] subcontractor. Each morning: (1) sweep [inboxes] and file vendor invoices, checking each line against the PO or quote and listing any price that doesn’t match; (2) list missing or odd entries in this week’s [timesheet app] before payroll; (3) for any new contract or spec set, list risky clauses (pay terms, retainage, backcharges, scope), plan conflicts, and draft RFI questions. Don’t send or sign anything. Give me one short list to approve.

Make it run every week

A play works once. Turn it into a routine in three small steps:

  1. Run it once and check the result yourself.
  2. Give your AI a schedule. Tell it when to run this play (every week, or every month) and to message you with what it found before you act.
  3. Keep a log. One line per run: what was checked, anything flagged, what you did.

See how owners turn plays into systems →

What to watch out for

Self-reported from her own posts, early days. Have a person check every pricing flag and RFI before it goes to a GC, and keep the final bid number with your estimator. AI takeoffs are still being tested against past jobs. Build it with Page: a capabilities page GCs can check before they invite you to bid.

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