Master Procurement · For cost control

Your batch, audited.

End-of-month batch of 1,000 lines? 1,000 workers run. Each cross-references the BOQ line, validates progress against site measurements, checks the Schedule of Rates. The industry-consensus 3–5% overbilling becomes a number you reclaim — not absorb.

Start the 15-day pilotSee the Marketplace extensions
A procurement manager's desk: invoice stacks and supplier audit binder on the left, Vonbuild's bid-rigging detection dashboard on the right

Left — the 50 invoices your junior QS samples · Right — the 1,000 Vonbuild verifies line-by-line

Who Master Procurement serves

Not just the commercial manager.

The commercial manager is the daily driver. But Master Procurement runs into every moment cost touches the supply chain — QS reconciliations, supplier qualification, category strategy, dispute support. Four roles converge.
Commercial Manager
Primary driver
Commercial Manager
Supplier audits, bid-rigging detection, category strategy, hedging.
Quantity Surveyor
Also uses
Quantity Surveyor
End-of-month invoice reconciliation, line-by-line audit.
Project Director
Also uses
Project Director
Cost-overrun chain analysis, supplier qualification.
Site Manager
Also uses
Site Manager
Delivery validation against site measurements.
Marketplace · Procurement extensions

Six patterns your firm builds.

Reusable capabilities your firm builds once. Workflows, knowledge packs, mini-apps, always-on agents, encoded processes. The six below are examples — your library grows from your protocols. DSI keeps the governance gate.
Workflow
1 wk → 4h
EXT-PRC-01

Verify the invoice batch

The signature workflow below. Per-line BOQ + Schedule of Rates verification with full evidence pack. End-of-month autopilot.
Agent
always-on
EXT-PRC-02

Supplier-anomaly sentinel

On your project, flags coordinated pricing, capacity sharing, suspicious withdrawals — drawing on the firm's full supplier history (non-sensitive). Portfolio-wide always-on monitoring = roadmap.
Process
2 wk → 1 day
EXT-PRC-03

Multi-criteria supplier qualification

Your vetting protocol, encoded — technical, financial, ESG, capacity, prior performance. Scores every prospective supplier against the house standard.
Mini-app
ad hoc
EXT-PRC-04

Check Schedule of Rates drift

Submitted rates vs your contracted SoR + market index. Flags rates that have drifted upward without contractual basis.
Knowledge pack
always-loaded
EXT-PRC-05

Steel & concrete category strategy

Hedging plans, supplier landscape, price-index tracking — your firm's category playbook, built and curated by your buyers. Available across projects (non-sensitive).
Workflow
impossible → 4h
EXT-PRC-06

Run bid-rigging forensic

Analyses 24 months of your firm's supplier responses across 30+ tenders (non-sensitive bid metadata). Coordinated pricing, capacity sharing, suspicious withdrawals — flagged with the supporting evidence.
Inside the app · Marketplace

Where your firm's procurement methods live.

Every invoice-verification protocol, every supplier qualification matrix, every category strategy your team builds — versioned, audited, available to every buyer from day one.

Extensions

Context
vonbuild·Org=design_officeFunc=engineering
Filters
Organisation:design_office×Function:engineering×Disable auto-filters
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Clear all
Plugins9— groups skills + agents + commands
Legal & Contractspluginvonbuild

Construction contract analysis, claims management and legal risk assessment

7 / 26 workspaces· Legal
1 skill
Estimation & Costingpluginvonbuild

Construction estimation — DPGF/DQE/BOQ analysis, quantity validation and unit price comparison

Active everywhere· Sales
2 skill
Site Operationspluginvonbuild

Site supervision, defect tracking, daily reports and works acceptance

7 / 26 workspaces· Ops
1 skill
Planning & Orchestrationpluginvonbuild

Multi-agent orchestration — workspace scan, document classification and execution roadmap generation

10 / 26 workspaces· Plan
1 agent
Procurement & Subcontractingpluginvonbuild

Supplier management, invoice verification, subcontract tracking

3 / 26 workspaces· Proc
1 skill
Technical Directionpluginvonbuild

Technical feasibility, pre-construction studies, engineering review (Eurocode / DTU / SIA)

3 / 26 workspaces· Tech
1 skill
Skills7— not attached to a plugin
DTU StandardsskillvonbuildFR

DTU pitfalls — installation errors causing non-conformities and insurance claims.

9 / 26 workspaces
SIA StandardsskillvonbuildCH

SIA standards — Swiss federation of engineers and architects technical norms

5 / 26 workspaces
FIDIC Contractsskillvonbuild

Standard FIDIC contracts — Red, Yellow, Silver books for international construction

5 / 26 workspaces
CCAG TravauxskillvonbuildFR

CCAG general administrative clauses for public works in France

5 / 26 workspaces
MCP3
Revit 2027mcptenant

Autodesk Revit 2027 — BIM model querying, family extraction, clash detection via Computer Use.

0 / 26 workspaces
ERP 2027mcptenant

Sage / Cegid ERP 2027 — purchase orders, supplier ledgers, situation reports.

Active everywhere
HubSpotmcptenant

HubSpot CRM — deals, contacts, pipeline sync for the Sales tower.

0 / 26 workspaces
One pattern · The 1,000-invoice batch

Verify a 1,000-invoice batch.

One pattern, many deliverables. Invoice batch today. Supplier qualification next. Bid-rigging forensic next month. Same workflow: scan in parallel, flag anomalies, attach the evidence.
invoice-batch-verifier.workflow1,000 workers · RUNNING
01Batch ingest
Pulls invoices from supplier portals (Coupa, Ariba), email attachments, ERP exports. Normalises formats.
02Line decomposition
Per-line BOQ matching, rate verification against contract, quantity check against delivery slips.
03Cross-reference
Site measurements, delivery dockets, change orders, prior progress claims — every line tied to its evidence chain.
04Flag anomalies
Overbilling. Duplicate billing. Scope creep. Rate drift. Suspicious round numbers. Each flag carries its evidence.
05Evidence pack
Per-flag: source invoice + BOQ ref + site measurement + delivery slip + recommended action. Dispute-ready.
Consolidated output · 4 hours end-to-end
1,000 invoices verified · 47 anomalies flagged · 3.7% overbilling documented · per-flag evidence pack · ERP-ready validated batch. Reclaim-ready.
1,000
Invoices processed
4 hours
vs. 1 week senior
3.7%
Overbilling found
47
Anomalies flagged
Time stats are illustrative — industry benchmarks (Monograph 2025, Part3 2025) compressed by the workforce model. Not measured Vonbuild outcomes per project.
Live process · Procurement cascade

You ask Procurement. Five agents react. One audit trail.

An invoice lands in OneDrive. Master Procurement spawns five reconciliation agents in parallel. Match, scan, audit, draft a PO — under two minutes, evidence chain attached. Stock follow-up scheduled at delivery.

Signal

An invoice lands in OneDrive at 14:32.

Any source can fire it: a file dropped in OneDrive / Google Drive / any drive, an email landing in Outlook, a scheduled task firing, or you pressing a button. In this scenario, an event arrives via ONEDRIVE.

Source: ONEDRIVE · invoice-aluFacades-441.pdf
Routing

MASTER PROCUREMENT routes.

It classifies the impact across 21 semantic categories and dispatches to the 5 specialized agents concerned. No human in the loop. No meeting scheduled.

5 specialized agents dispatched · 312 ms
Parallel reaction

5 specialized agents. In parallel.

Each agent accesses its own toolset — apps, browsers, MCP connectors, project documents and company knowledge — and produces a structured output. Concurrently, not sequentially.

AGENT
Invoice Reconciler
€428,300
matched against PO
AGENT
Supplier Scanner
4 quotes
Δ €18.2k vs baseline
AGENT
PO Generator
PO-2026-441
purchase order drafted
AGENT
Discrepancy Auditor
1 overbill
€3,840 flagged
AGENT
Stock Tracker
S355 LV-3
12 t in transit
5 outputs produced
Convergence

Outputs return. One narrative.

The 5 specialized agents return their outputs to MASTER PROCUREMENT. It reconciles them into a single decision card.

1 reconciled decision
Validation

Handed to you. One click.

Master Procurement returns the reconciliation. Invoice matched against PO, alternatives scanned, discrepancies flagged, PO drafted, stock tracked through delivery. Full evidence chain. One trace ID. Ready to post.

3 min · signal → decision
Self-scheduled trigger

T+7 DAYS LATER. The system wakes itself up.

During the parallel phase, a agent scheduled a follow-up task on its own. T+7 DAYS LATER — without you, without a meeting, without a reminder email — MASTER PROCUREMENT wakes itself, dispatches the right agent, and executes autonomously. You delegated the mental load.

T+3minT+7 DAYS LATER · auto-fired
Auto-fired · 0 human intervention
Specialization · The corpus

Built for the frameworks your contracts cite.

Pre-trained on the public and private procurement standards your work runs on, with regional variants.
Procurement frameworks
INCOTERMS 2020FIDIC procurementEU procurement directivesCCAG (FCS, Travaux)VOB/A (Germany)SIA 102 (Switzerland)World Bank SBDICC model contractsISO 20400 sustainableUK Procurement Act 2023OECD anti-collusion
Cost & supplier concepts
BOQ / Bill of QuantitiesSchedule of RatesDPGFProgress paymentFinal accountVariation orderProvisional sumMEAT scoringSupplier qualification matrixCategory strategyHedging planCoordinated biddingCapacity-share collusion
A week with Master Procurement

What changes for a quantity surveyor.

25th of the month. 1,000 invoices land. You point Procurement at the batch. Four hours later — every line verified, 47 anomalies flagged with evidence. The €180K that used to slip through the sample stays inside the firm.
Input · 25th of the month
1,000-invoice batch
~12K line items · ~30 suppliers
Output · 4 hours later
47 anomalies flagged with evidence. BOQ cross-reference complete. Schedule of Rates verified.
Input · 24 months tender data
30+ supplier responses
Coordinated pricing · capacity
Output · 4 hours
Bid-rigging patterns surfaced. Coordinated withdrawals flagged. Evidence pack assembled.
Input · Supplier qualification
12 candidates · 4 criteria
Technical · financial · ESG · capacity
Output · 1 day
Multi-criteria score per supplier. Risk flags. Top 3 ranked with audit trail.
The industry-consensus 3–5% overbilling is no longer a number you absorb. It's a number you reclaim every month.
Always on · Always aware

The project remembers itself.

Every invoice. Every delivery slip. Every supplier email. Captured the moment it lands. Connected to the BOQ. Indexed for the recovery you don't know is coming yet.
Project-centric · firm-aware on non-sensitive · sensitive stays gated
47 documents indexed
Ingestion processing 47 documents
Automatic capture

You don't upload. It sees.

Every invoice landing in the ERP. Every supplier portal update. Every delivery slip scanned on site. Every BOQ revision. Captured the instant it arrives. The cost memory grows itself.
Hidden connections

Dots you can't see, joined.

An invoice line. A BOQ row. A delivery slip from three weeks ago. A site measurement from yesterday. A change order. The system sees the chain. Ask anything across the batch — get a sourced answer.
Team-shared

Your QS sees what the controller flagged.

Cost controller sees the same supplier history the buyer worked from. Finance sees what the QS validated. Project director sees the recovery total. Same project memory, different views.
Recovery-ready

The dispute file is built before the dispute.

When the supplier disputes the withhold, the evidence is in your hands. Every overbilling instance documented. Every site measurement timestamped. Every rate cross-referenced to contract. Nothing to reconstruct.
Working into the future · Self-scheduling
Visible in your Outlook · calendar "Vonbuild"

Schedule any task — once or recurring.

The same modal your QS uses to schedule the next end-of-month batch is the engine the agent uses to schedule its own future work — autonomously, no prompt needed. Both surface in the same Outlook "Vonbuild" calendar. The agent re-runs the batch; you review the flags.
Option A · One-time
Option B · Recurring
Live demo · Computer Use on your stack

It runs inside the tools your team already uses.

No new UI for your QS team to learn. Coupa stays Coupa. SAP stays SAP. The agent operates them in the same format your team already audits.
app.coupa.com/invoices/batch-2026-05/verify
Worker · running
Batch progress
Total lines · 1,000
Verified · 487 / 1,000
Flagged · 23 (so far)
Clean · 464
Pending · 513
Worker action — line_verifier
Cross-referencing line 487 — verifying SoR rate against contract CC-2025-04
elapsed 02:14 · est. remaining 01:46 (batch)
Anomaly flagged · CC-2026-04287 line 487
BOQ ref3.2.4 · C30/37 ready-mix
Claimed qty247 m³
Site-measured229 m³ (per pour log 2026-04-12)
Rate claimed€158/m³ (contract: €152/m³)
Anomalyrate + qty overbill · €5,394
Operates inside your existing stack
SAPOracleSageCoupaAribaOutlook (web)Plus any software with MCP
Reconciliation runs in Vonbuild's built-in spreadsheet. ERP and supplier portals driven via browser or MCP — anything with an MCP server connects. ERP-ready outputs with the per-flag evidence pack attached.
Mechanism · How it works

One batch. N invoices. One verified deliverable.

01
Decompose
The batch breaks into per-line verifications — invoice line, supplier, BOQ row each get their own task.
02
Spawn workers
One worker per invoice line. 1,000-line batch, 1,000 workers. No queueing.
03
Load extensions
Marketplace extensions run — BOQ matcher, Schedule of Rates checker, supplier-anomaly detector, contract cross-reference.
04
Consolidate
Validated batch + per-flag evidence: source invoice, BOQ line, site measurement, recommended action.
Master Procurement is built for parallel volume. The 25th is no longer a week of senior QS time — it's four hours of agent execution and one hour of your review. Every flag carries source invoice, BOQ line, site measurement, recommended action. You manage exceptions, not routine.
Four routes. One promise.

How the work actually gets done.

When the agent picks up a task, it works through these four routes in order. Whatever produces a real, verifiable result, ships. If nothing does, you hear back — never with a made-up number.
01
A tool that already exists

Reach for what's on the shelf.

Your firm has built this workflow before. Or Vonbuild ships it out of the box. The agent picks the right one and runs it — like your engineer reaching for a checklist they trust.
02
A tool the agent builds

Make the missing one.

Need a calculation nobody's done in your firm yet? Hand the agent the norm — EN 13474 for glazing, Eurocode 2 punching shear, RT2020 thermal. It builds the calculator, checks it against known cases, runs your project. Next project, that calculator's already in your firm's library.
03
A tool that talks back

Connect straight through.

Some of your software — Revit, a growing list of cloud tools — lets the agent connect directly, without going through screens. No clicking, no waiting. The cleanest route when it's available.
04
A tool the agent uses like you would

Click through, like an engineer would.

Everything else — Robot, ETABS, Coupa, Procore, your supplier portals. The agent logs in with your licence and works the interface exactly as your engineer or QS would. Same software, same result, same paper trail. None of your hours.
Or — you hear back, with the reason
No made-up numbers
When none of the four routes works, the agent tells you what it tried, where it stopped, and what would unblock it. It does not invent a number to fill the gap. The output on your screen is always a real result from a real tool — or there's no output.
Polycentric model

Procurement alone, or Procurement in concert.

Procurement leads (sole driver)
  • Invoice batch verification
    End-of-month autopilot. Sole driver.
  • Supplier qualification
    Multi-criteria scoring of prospective suppliers.
  • Bid-rigging forensic analysis
    24-month coordinated-pricing detection across tenders.
  • Category strategy & hedging
    Steel, concrete, MEP — strategic context maintained continuously.
Procurement supports another lead
  • Variation impact assessment
    Engineering / Sales lead · Procurement quantifies sourcing delta
  • Subcontractor termination
    Operations leads · Procurement scopes the replacement
  • Bid response assembly
    Sales leads · Procurement validates supply assumptions
  • Supplier dispute
    Legal leads · Procurement provides commercial context
See the full polycentric model →
What this workforce guarantees

“I already feed my SAP and my own Excel. How does this connect to my cost ledger without creating a third source of truth?”

The cost ledger stays where it already lives. SAP, Oracle, Sage — your ERP holds the books. The workforce reads the invoices, checks them against the BOQ and site measurements, and pushes clean lines back in your existing upload format. Flagged anomalies surface in the Excel batch sheets your QS already opens. No parallel system to reconcile. No third place to keep in sync.
Your cost ledger stays the source of truth
SAP / Oracle / Sage holds the books. The agent verifies and feeds — never replaces, never competes. Master ledger integrity preserved.
Reconciliation in files you already open
Workers populate the Excel batch sheet your team already audits. Flags surface in the rows. No new dashboard to monitor.
Per-flag evidence pack
Every anomaly carries source invoice + BOQ line + site measurement + recommended action. Dispute-ready from line one.
ERP upload-format clean batch
Validated lines push back to SAP / Oracle / Sage in the exact upload schema your AP team already accepts. No new mapping work.
audit_trail.json
{
"batch_id": "MAY-2026-INV-1000",
"supplier": "ConcreteCorp Ltd",
"invoice_no": "CC-2026-04287",
"line_id": 487,
"boq_ref": "3.2.4 · C30/37 ready-mix",
"claimed_qty_m3": 247,
"site_measured_qty_m3": 229,
"rate_claimed": "€158/m³",
"rate_contract": "€152/m³",
"anomaly_type": "rate_overbill + qty_overstatement",
"delta_amount": "€5,394",
"evidence": [
  "delivery_slip_DS-04287.pdf",
  "site_pour_log_2026-04-12.pdf",
  "contract_CC-2025-04_§3.2.4"
],
"recommended_action": "withhold + dispute_request"
}
Live demo · Audit trail

1,000 invoices verified. Every flag evidenced.

Master Procurement → per-line worker → BOQ cross-reference + site measurement + delivery slip → flagged anomaly. The full execution graph stays visible, exportable as JSON. When the supplier disputes the withhold, the evidence is in your hands.
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Live demo · Human-in-the-loop

The agent flags. You withhold.

Every Formal Notice, every dispute request, every external send blocks for your explicit approval. The AI never sends on your behalf. Your QS sign-off stays in the audit log. Liability stays with you.
Governance

Your supplier data stays inside your tenant.

Tenant-resident inside your existing Microsoft 365 or Google Workspace. ERP credentials stay in your secret store. Supplier negotiation data — the most competitively sensitive thing you handle — never leaves your boundary. Project-scope extensions need DSI approval before tenant-wide promotion.

Full security and governance architecture →

Start with your next end-of-month batch.

The 1,000-invoice reconciliation you've been doing by sample. That's where it earns it. Upload the batch. See the flags by lunch.
Start the 15-day pilotTalk to a procurement-savvy team member
Or explore another Master
Engineering →Legal →Sales →Operations →Generalist →