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Construction AI agent · Subcontractor management

Subcontractor-Management AI Agent

Most of what goes wrong here has no cure — a missed payment schedule, an unlicensed engagement, an uninsured loss. The agent verifies and counts down; the administrator decides.

Typical delivery
4–6 weeks
Deployment
Your stack
Human decides
Evidence only
After launch
Agent Care

What this agent does

Verifies the file; it never clears the sub

In

  1. 01

    Query the issuing regulator's licence register and record status, class and expiry against the check timestamp.

  2. 02

    Query the state labour-hire register for every provider named on the engagement, and record what came back.

Reason

  1. 03

    Run the security-of-payment countdown in business days under the Act of the state that governs the claim.

  2. 04

    Run insurance-expiry countdowns, and list which endorsements are on file and which arrived as a certificate only.

  3. 05

    Assemble the prequalification pack and list every item that is missing, expired or self-declared.

Decide

  1. 06

    Assemble engagement-status indicators as evidence, recording which test the jurisdiction applies and its current status.

  2. 07

    Route the open countdowns, the failed checks and the missing endorsements to the named administrator.

Out

  1. 08

    Retain every check, timer, escalation and acknowledgement against the engagement file.

  2. 09

    Execute write actions only inside the approval boundaries agreed during implementation.

Product statement

The agent verifies and escalates; the contracts administrator issues the schedule and the commercial manager engages the sub — and a window that has closed, or an engagement already made, has no way back.

Example workflow

One engagement, register to decision

  1. 1Engagement event receivedPrequalification submission, subcontract request, progress claim or renewal notice
  2. 2Registers queriedLicence status, class and expiry, labour-hire licence, certificates and endorsements, each with its check time
  3. 3Pack assembledMissing and expired items, open countdowns, indicators and confidence
  4. 4Controls appliedRegister-freshness checks, business-day countdowns in the governing jurisdiction, endorsement checks and confidence threshold

No human action required

Stages 1 to 4 run unaided, and nobody is cleared and no schedule is issued at any of them — the agent is verifying, and the administrator's lane opens at the confidence gate.

5DecisionBranches at the confidence threshold
High confidence

Goes to the administrator to decide.

Low confidence

Adds a risk-manager read first.

Administrator decision

The pack is held with its register results, its open timers and the confidence.

Accept pack · Reject · Send to risk review

Accepted — recorded against the engagement

  1. 6Prequalification systems updatedOnly where write access and approval policy allow it
  2. 7Outcome evaluatedRegister-check freshness, escalation acknowledgements, missing-item outcomes and post-engagement findings

Rejections

Every rejection is counted in the evaluation.

What should not run autonomously

Human approval stays in control

Outside the boundary — human approval required

8 items

  • Deciding whether a worker is an employee or a contractor.
    • Telling a worker they are a contractor.
    • Issuing, approving or varying a payment schedule.
    • Clearing a subcontractor or labour-hire provider.

  • Automation boundary

    Agent acts unaided

    • ✓Query licence and labour-hire registers and timestamp the result.
    • ✓Run payment and insurance countdowns.
    • ✓Assemble the pack and list what is missing or expired.
    • ✓Compile safety metrics and incident history into a briefing pack.

    Any write happens inside the boundaries agreed at implementation, never a statutory one.

    • Accepting or waiving an insurance requirement, or confirming cover.
    • Issuing or varying a scope letter or a subcontract.
    • Conducting or attesting a right-to-work or I-9 check.
  • Issuing a default notice or a termination.

Example output

One engagement check, annotated

Everything the agent reports is attached to the register it was read from.

Verification output · single engagement

Illustrative example
Trade
Electrical sub
What was checked
Contractor licence, class and scope checked against the issuing regulator's register
Expiry
Expires in 9 days
Source register
Regulator register
Confidence
91%
Status carried
Verified — not cleared

As received

Taken from the issuing register and the documents on file — nothing on this side is written by the agent.

What was read

  • Regulator licence register
  • Labour-hire register
  • Certificate and endorsements

Why this status

The register reads current for this class today — the administrator still decides.

What the score decides

Below the threshold the pack picks up a risk-manager read before the administrator.

Action

Accept packRejectSend to risk review

Value

Where AI adds value

The same four claims, placed at the point in the workflow where each one applies.

Where the value lands

Value 01 – 04

Every engagement

From the issuing register

03Verification

Verify against the source

Licence, labour-hire and insurance status are read from the issuing register or the endorsement itself, and every check is stamped with its time.

01Approved path

Check the register, not the PDF

Register checks, countdowns and prequalification packs are done before the administrator opens the file.

02Human review

Send review where cure runs out

Running countdowns and missing endorsements are marked, so the administrator's read starts where nothing can be fixed afterwards.

04

Build an evidence trail

What was checked, when, and against which register stays on the engagement file.

Integrations

Typical integrations

Five system groups connect to the same agent. Which of them are in scope is decided in discovery.

  • Prequalification and screening

    • Avetta
    • ISNetworld (ISN)

  • Project and subcontract management

    • Procore
    • Autodesk Construction Cloud
    • TradeTapp

  • Progress claims (AU)

    • Payapps
    • Progressclaim.com

Agent

Subcontractor management

  • Reads the registers
  • Runs the countdowns
  • Holds for the administrator

  • Workforce and registers

    • Assignar
    • Damstra
    • Licence
    • labour-hire registers

  • Observability & evaluation

    • OpenTelemetry
    • Langfuse
    • Supported monitoring/evaluation sources

Integration availability depends on the client's existing systems and API access.

Agent controls

Six layers between the model and the engagement

Each control wraps the one inside it. None of them restores a missed deadline — they exist so a named human reaches it first.

L6 · Outermost — last line of defence

Inward → L1 · closest to the model

L6Rollback / safe modePull the agent back to reporting only when evaluation or production signals degrade.Roll back
L5Version monitoringTrack model, prompt, register-source and rules-configuration changes.Track
L4TraceabilityRecord every check, its timestamp, the escalation and the human who acknowledged it.Record
L3Administrator decisionHold packs for the named administrator; it governs release, not whether the engagement is sound.Gate
L2Policy guardrailsTest packs against register-freshness, jurisdiction and endorsement rules; a stale check returns the pack.Restrict
L1Confidence thresholdsRoute low-confidence packs to a risk-manager read before the administrator sees them.Require review
Model corePack produced — register results, open countdowns, missing items and confidence
L1 – L2
Test whether a pack may stand
L3
Puts the decision in the administrator's hands
L4 – L5
Retain what was checked and against which register
L6
Falls back to register reads when signals degrade

How Nestack evaluates it

Evaluate the verification workflow — not only the status line at the end.

Coverage runs the whole depth of the workflow, and every layer is cut by slice.

Surface — the status the engagement file shows

  1. E1Final-output evaluationDid each reported status match the register entry it cites?
  2. E2Step-level evaluationDid the agent read the right register, the governing Act and the endorsement itself?
  3. E3Tool evaluationDid it read and write the correct engagement record and the correct field?
  4. E4Confidence calibrationDo low-confidence packs actually attract more rejections?
  5. E5Slice evaluationHow does performance change across specific engagement types?
  6. E6Business outcomeHow many packs were rejected, or corrected after the engagement was made?

Floor — the exposure nobody can undo

Failure modes

Where each failure originates in the agent

Seven failure modes, each attached to the stage it comes out of.

Agent lifecycle

Direction of processing →

  1. 01 · Retrieval

    1 mode

    • PQ-01

      Stale register result

      A cached check clears a sub whose licence lapsed mid-performance.

    Stage gathers

    Registers, certificates, claims and engagement files

  2. 02 · Reasoning

    2 modes

    • PQ-02

      Contractor inferred from paperwork

      An ABN, an invoice and a written contract are read as settling status.

    • PQ-03

      Statutory window miscounted

      Calendar days, or the wrong state's Act, drive the countdown.

    Stage proposes

    Register status, open countdowns and confidence

  3. 03 · Tool / write

    2 modes

    • PQ-04

      Payment schedule auto-issued

      A defective statutory document is generated to beat a running timer.

    • PQ-05

      Prequalification flipped on upload

      A certificate lands with no endorsement present, and site access opens.

    Stage writes

    Only where write access and approval policy allow it

  4. 04 · Output

    1 mode

    • PQ-06

      Insured shown as a binary

      Certificate, live cover and endorsement collapse into one word.

    Stage returns

    The status the administrator reads and acts on

  5. 05 · Change / Version

    1 mode

    • PQ-07

      Test changed under the population

      A rules update silently re-scores subcontractors already engaged.

    Stage tracks

    Model, prompt, register sources and rule configuration

  • Sev-1 · a held act, or a bad-check engagement
  • Sev-2 · a wrong status reaches the file
  • Sev-3 · a register degrades, pack held
See the complete Construction failure-mode catalogue

Affected slices

One tier holds most of what cannot be fixed

The unremediable-exposure rate counts engagements and payment cycles where an agent error produced an exposure with no cure available, which is most of what can go wrong on this page.

Slice performance — reported separately, not only in aggregate

Illustrative example
SliceFailure rateLiftLift vs. thresholdStatus
Multi-tier subcontracting with labour hire7.9%3.3×Review
US state-licensed residential trades6.0%2.5×Review
Cross-border and migrant labour3.6%1.5×Watch
Repeat subs, one jurisdiction1.2%0.5×Normal

Bar: unremediable-exposure lift vs. an all-engagement baseline · scale 0–4.0× · tick marks the 2.0× review threshold

2 of 4 slices over threshold

Evidence-linked improvement

The loop ends where the next test starts

A cycle is finished when the failure sits in the regression suite as a case the next release must pass.

Improvement cycle · five stages

Switchback — the path turns at Improve and returns at Learn

  1. 01

    Detect

    Unremediable-exposure rate rises in an engagement slice.

  2. 02

    Diagnose

    The administrator reads the register results first, then the timer log, until one of them accounts for it.

  3. 03

    Improve

    The correction carries its version and the engagement records behind it.

  4. 04

    Verify

    The affected cases are re-run before anything ships.

  5. 05

    Learn

    It lands in the permanent suite and in the verification checklist.

  6. Learn → Detect

    The return edge. Every later cycle begins against a suite this one made longer.

Typical build scope

Twelve workstreams across six weeks

The build scope read against the delivery timeline. Week structure follows the six-week plan — discovery, sources, verification workflow, evaluation, integration, then production validation and handover.

Workstream

Week 1Week 2Week 3Week 4Week 5Week 6

  1. 01Engagement workflow discovery and boundary work.Week 1
  2. 02Register and claims source assessment.Week 1, Week 2
  3. 03Jurisdiction, licence-class and endorsement mapping.Week 1, Week 2
  4. 04Register ingestion and status normalisation.Week 2
  5. 05Verification and countdown logic.Week 2, Week 3
  6. 06Confidence scoring and escalation routing.Week 3
  7. 07Administrator workflow.Week 3, Week 4
  8. 08Prequalification and claims integration.Week 5
  9. 09Verification regression cases.Week 4, Week 5
  10. 10Guardrails and engagement controls.Week 4
  11. 11Check-trail instrumentation.Week 5, Week 6
  12. 12Deployment, documentation and Agent Care handover.Week 6

12 workstreams · 6 weeks · bar shows the weeks a workstream is active — several run in parallel

Final scope and sequence confirmed in discovery

Engagement tiers

What each tier includes

Rows are the capabilities named in each tier's scope. Higher tiers include everything below them.

Capability✓ in scope · — not at this tierPilotOne trade, one jurisdictionProductionProduction engagement systemsAdvancedMultiple entities / jurisdictions
Introduced at Pilot
Register checks and countdowns✓✓✓
Administrator decision✓✓✓
Verification baseline✓✓✓
Introduced at Production
Reporting by engagement type—✓✓
Review workflow in your systems—✓✓
Approved write-back—✓✓
Compliance dashboard integration—✓✓
Introduced at Advanced
Multi-jurisdiction rule sets——✓
Multi-stage commercial review——✓
High engagement volume——✓
Enterprise engagement controls——✓
Build priceFrom $5,000From $8,000Custom quote
Final build price
Confirmed after discovery based on integrations, workflow complexity, engagement volume, approval controls and deployment requirements.
Separate from build
Build pricing is separate from recurring Agent Care, which covers managed monitoring, evaluations, incidents and verified improvements after launch.

What we need from you

What you bring, and what we build with it

Each input maps to a piece of build scope and a week in the delivery timeline.

  1. 01Your prequalification requirements and forms

    Register mapping and verification-rule setup

    Week 1

  2. 02Representative engagement files

    Verification baseline, register queries and countdown logic

    Week 2

  3. 03Your insurance schedule and endorsement standards

    Insurance and endorsement mapping, and automation-boundary definition

    Week 1

  4. 04Access to relevant APIs, feeds or exports

    Register, prequalification and claims assessment, then integration setup

    Week 2

  5. 05Engagements you would not repeat

    Verification cases and the evaluation suite

    Week 4

  6. 06The checks that must clear before an engagement proceeds

    Confidence scoring, escalation routing, guardrails and approval controls

    Week 3

  7. 07Named administrators to receive the packs

    Administrator decision workflow, then pilot and production validation

    Weeks 5–6

Nothing else is required

Deployment, documentation and Agent Care handover are ours.

Delivery timeline

Four phases across six weeks

Phases occupy the weeks they are actually worked. Week 5 runs evaluation and pilot together.

Phase

W1

W2

W3

W4

W5

W6

  1. DiscoveryW1
  2. BuildW2 – W3
  3. EvaluateW4 – W5
  4. Pilot & LaunchW5 – W6

Week focus

W1Engagement workflow discovery, jurisdiction mapping and the boundary

W2Register integration and the verification baseline

W3Countdown logic, confidence scoring and escalation controls

W4Evaluation suite, guardrails and failure-mode testing

W5Prequalification integration, pilot engagements and targeted corrections

W6One engagement and payment cycle under the administrator, then handover

Reading the band
A bar stops where its named work stops. The week 5 overlap is real, not padding.
At the end of W6
Everything verified against live engagements, with Agent Care carrying it forward.
Duration
Six-week plan shown · typical delivery 4–6 weeks depending on scope confirmed in discovery.

Next step · Construction AI agent

Build a subcontractor agent around the administrator who decides.

Show us your registers, your insurance schedule and who issues the payment schedule. Which of your engagements could you not undo if the check turned out to be wrong? We start there, then name what the agent never touches.

Typical delivery
4–6 weeks
Deployment
Your engagement stack
Human decides
Evidence only
After launch
Agent Care available

Nestack Agents · Subcontractor management

AGT-CN-05 · Agent Care available after launch

Build a subcontractor agent

Four questions so the call starts from your actual setup — then pick a time that suits you.

About you
Your subcontractors

No obligation. We’ll map the workflow, name the automation boundary and tell you if an agent is the wrong answer.