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Retail AI agent · Supplier terms

Supplier-Negotiation & Chargeback AI Agent

Match the purchase order to the receipt, assemble the evidence a deduction would need, and post nothing until the deductions analyst has approved it against a named supplier agreement.

Typical delivery
4–6 weeks
Deployment
Your stack
Analyst signs
Evidence-first
After launch
Agent Care

What this agent does

Builds the case, does not take the money

In

  1. 01

    Ingest purchase orders, shipment notices, receipts and invoices from supported ERP, portal or EDI sources.

  2. 02

    Normalise the lines, and carry every variance forward with the document it came from.

Reason

  1. 03

    Match order to shipment to receipt, and size only the variance those documents support.

  2. 04

    Apply the supply agreement, the deduction tolerances and the grocery-code classification for that supplier.

  3. 05

    Keep each supplier's terms partitioned to that supplier's file, out of any other negotiation.

Decide

  1. 06

    Flag any allowance the retailer's own data shows is not offered on proportionally equal terms.

  2. 07

    Route every proposed deduction to the deductions analyst who approves it.

Out

  1. 08

    Retain the evidence, the rule, the notice sent, the approver and the dispute that followed.

  2. 09

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

Product statement

Robinson-Patman is live again and it binds the buyer as well as the seller — knowingly inducing a discriminatory allowance is itself unlawful, so the agent proposes and the analyst decides.

Example workflow

One deduction, receipt to posting

  1. 1Variance detectedA purchase order, a shipment notice, a receipt or a defect record
  2. 2Evidence assembledOrder lines, shipment notice, receipt, defect record and the agreement in force
  3. 3Deduction proposedAmount, the rule that produced it, the contract it sits under and confidence
  4. 4Evidence checks runEvidence checks, contract-scope checks, code-coverage checks, exposure caps and confidence threshold

No human action required

Stages one to four run unaided and no money is withheld at any of them — the agent is building the case, and the analyst's lane opens at the confidence gate.

5DecisionSplits on the evidence threshold
Evidence complete

Goes to the deductions analyst to approve.

Evidence thin

Adds a supplier-compliance read first.

Deductions-analyst approval

The deduction is held with its evidence, its contract scope and the confidence.

Approve · Amend · Send to compliance

Approved — notice, then posting

  1. 6Payables systems updatedOnly where write access and approval policy allow it
  2. 7Deduction evaluatedReversal rate, evidence completeness, dispute outcomes and code complaints

Reversals logged

Every analyst amendment is counted in the evaluation.

What should not run autonomously

Human approval stays in control

Outside the boundary — human approval required

8 items

  • Posting any deduction against a supplier.
    • Approving a deduction against a code-covered supplier.
    • Setting the deduction rule set and its tolerances.
    • Authorising a position on price, allowance or term.

  • Automation boundary

    Agent acts unaided

    • ✓Match purchase order to shipment notice to receipt.
    • ✓Assemble the evidence packet behind a proposed deduction into the review queue.
    • ✓Issue notice of intention to deduct on approved items.
    • ✓Halt a rule and quarantine its queue when reversals breach for the named owner.

    Any write happens inside the boundaries agreed at implementation, never ahead of approval.

    • Deciding a disputed deduction after the supplier rebuts.
    • Settling aggregated open deductions with a supplier.
    • Delisting, volume cuts or promo withdrawal during a dispute.
  • Remediation and self-reporting after a wrong deduction.

Example output

One deduction, annotated

Everything the agent proposes is attached to the evidence it was built from.

Deduction output · single claim

Illustrative example
Supplier
Domestic ambient supplier
Proposed deduction
Short receipt against the purchase order on one delivery
Amount
$1,240.00
Evidence on file
Receiving discrepancy record
Confidence
91%
Contract scope
Same agreement as the invoice

As received

Taken from the purchase order, the shipment notice and the receipt — nothing on this side is inferred.

Evidence attached

  • Purchase-order line
  • Shipment notice
  • Receiving discrepancy record

Why this deduction

It runs against the same agreement as the invoice — the point the analyst weighs.

What the score decides

Below the configured threshold the deduction picks up a compliance read before it reaches.

Action

ApproveAmendSend to compliance

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 deduction

From the order and the receipt

03Substantiation

Build the evidence file

Draw on the purchase order, the shipment notice, the receipt and the agreement in force.

01Approved path

Deduct on evidence

Routine variances arrive with their evidence already assembled.

02Human review

Send review to the exposed claims

Code-covered suppliers and thin evidence are marked, so the analyst's read starts where exposure concentrates.

04

Build an evidence trail

The deduction keeps the evidence file and the buyer who raised it.

Integrations

Typical integrations

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

  • Source-to-pay suites

    • SAP Ariba
    • Coupa
    • Jaggaer
    • Ivalua

  • Negotiation systems

    • Pactum
    • Keelvar
    • Sourcing and contract repositories

  • Deductions and claims

    • HighRadius Deductions
    • iNymbus
    • Supplier portals
    • EDI

Agent

Supplier negotiation & deductions

  • Reads the documents
  • Proposes the deduction
  • Holds for approval

  • Allowances and workflow

    • Enable
    • Vividly
    • Approval and dispute systems

  • 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 payment run

They nest. What a layer does not catch appears in the map below.

L6 · Outermost — last line of defence

Inward → L1 · closest to the model

L6Rollback / safe modePull deductions back to proposal-only when evaluation or production signals degrade.Roll back
L5Version monitoringTrack model, prompt, tolerance and code-classification changes.Track
L4TraceabilityRecord the evidence, the rule, the notice, the approver and the posting time.Record
L3Analyst approvalHold deductions for the named analyst; it governs posting, not whether an approved deduction is right.Gate
L2Policy guardrailsTest proposals against evidence, contract scope, tolerance and code rules; a failure returns the deduction.Restrict
L1Confidence thresholdsRoute low-confidence deductions to a compliance read before the analyst sees them.Require review
Model coreDeduction proposed — amount, rule, contract scope, evidence and confidence
L1 – L2
Test whether a deduction may stand
L3
Puts the posting in an analyst's hands
L4 – L5
Keep the evidence file with the deduction
L6
Stops raising deductions when signals degrade

How Nestack evaluates it

Evaluate the deduction workflow — not only the amount withheld.

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

Surface — the claim the supplier receives

  1. E1Final-output evaluationWas the deduction supported by the evidence attached to it?
  2. E2Step-level evaluationDid the agent use the right agreement, tolerance and code classification?
  3. E3Tool evaluationDid it write the correct invoice under the correct contract?
  4. E4Confidence calibrationDo low-confidence deductions actually attract more reversals?
  5. E5Slice evaluationHow does performance change across specific supplier groups?
  6. E6Business outcomeHow many deductions were reversed, withdrawn or unsupported on audit?

Floor — the money withheld from a supplier

Failure modes

Where each failure originates in the agent

Seven modes across the deduction lifecycle.

Agent lifecycle

Direction of processing →

  1. 01 · Retrieval

    1 mode

    • VN-03

      Cross-supplier retrieval

      A rebate schedule belonging to another supplier enters a live thread.

    Stage gathers

    Order lines, shipment notices, with the source each came from

  2. 02 · Reasoning

    2 modes

    • VN-04

      Mis-scan read as shortage

      A receiving mis-scan is treated as a delivery that fell short.

    • VN-06

      Silence read as acceptance

      A supplier's non-reply inside the window closes the claim as agreed.

    Stage proposes

    Amount, rule, contract scope and confidence

  3. 03 · Tool / write

    2 modes

    • VN-02

      Wrong contract netted

      The deduction lands on an invoice from a different agreement.

    • VN-05

      Payment held past the deadline

      An open deduction blocks a perishable invoice past its payment date.

    Stage writes

    Only where write access and approval policy allow it

  4. 04 · Output

    1 mode

    • VN-01

      Another supplier's term quoted

      A demand reuses wording drawn from a different supplier's file.

    Stage returns

    The demand and the deduction the supplier

  5. 05 · Change / Version

    1 mode

    • VN-07

      Silent tolerance regression

      A rule-set update tightens tolerance and sweeps months of past receipts.

    Stage tracks

    Model, prompt, tolerances and code classification

  • Sev-1 · money withheld outside the boundary
  • Sev-2 · an unsupported deduction reaches
  • Sev-3 · evidence degrades
See the complete Retail failure-mode catalogue

Affected slices

Overall accuracy can hide one supplier group

The unsubstantiated-deduction rate is the share of posted deductions later reversed Nestack reports it by slice rather than in aggregate The cohorts that carry it are named, not averaged away..

Slice performance — reported separately, not only in aggregate

Illustrative example
SliceFailure rateLiftLift vs. thresholdStatus
Small perishable, code-covered4.9%3.8×Review
Concentrated, parallel negotiations2.7%2.1×Review
Multi-contract national suppliers1.8%1.4×Watch
Single-contract domestic, clean EDI0.9%0.7×Normal

Bar: unsubstantiated-deduction lift vs. the all-deduction baseline · scale 0–4.0× · tick marks the 2.0× review threshold

2 of 4 slices over threshold

Evidence-linked improvement

A cycle ends in the suite, not in a note

A cycle ends when the miss is reproducible on demand and the next release has to beat it.

Improvement cycle · five stages

Switchback — the path turns at Improve and returns at Learn

  1. 01

    Detect

    Reversals rise in one supplier group.

  2. 02

    Diagnose

    First the reversed deductions are read against their evidence, then the rule that raised them is replayed until one cause is left.

  3. 03

    Improve

    The fix and the deduction file that caused it move together, under one version.

  4. 04

    Verify

    A fail on the affected cases is a blocking condition, not a note.

  5. 05

    Learn

    The case joins the suite and the deduction-evidence standard.

  6. Learn → Detect

    The return edge. The next detection meets a suite one case longer than this one.

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, deduction workflow, evaluation, integration, then production validation and handover.

Workstream

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

  1. 01Deduction workflow discovery and boundary definition.Week 1
  2. 02ERP and deduction-source assessment.Week 1, Week 2
  3. 03Supply-agreement, tolerance and code-coverage mapping.Week 1, Week 2
  4. 04Order, shipment and receipt ingestion.Week 2
  5. 05Variance logic and evidence binding.Week 2, Week 3
  6. 06Confidence scoring and exposure routing.Week 3
  7. 07Deductions-analyst approval.Week 3, Week 4
  8. 08ERP and supplier-portal integration.Week 5
  9. 09Evidence regression cases.Week 4, Week 5
  10. 10Guardrails and deduction controls.Week 4
  11. 11Evidence-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 category, one supplier setProductionProduction deduction volumeAdvancedMultiple categories / regions
Introduced at Pilot
Proposals with an evidence file✓✓✓
Deductions-analyst approval✓✓✓
Evidence baseline✓✓✓
Introduced at Production
Reporting by supplier—✓✓
Approval workflow in your systems—✓✓
Approved write-back to payables—✓✓
Supplier-portal integration—✓✓
Introduced at Advanced
Multi-region supplier sets——✓
Multi-stage buyer approvals——✓
High deduction volume——✓
Enterprise supplier controls——✓
Build priceFrom $5,000From $8,000Custom quote
Final build price
Confirmed after discovery based on integrations, workflow complexity, transaction 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 supply agreements and deduction tolerances

    Supply-agreement and tolerance mapping

    Week 1

  2. 02Representative past deductions

    Variance baseline, evidence assembly and binding

    Week 2

  3. 03Which suppliers sit under a grocery code

    Code-coverage mapping, and the automation boundary

    Week 1

  4. 04Access to relevant APIs, feeds or exports

    ERP, portal and EDI assessment, then integration setup

    Week 2

  5. 05Deductions the supplier reversed

    Evidence cases and the evaluation suite

    Week 4

  6. 06What evidence a deduction must carry

    Evidence thresholds, deduction routing and controls

    Week 3

  7. 07A named buyer to approve deductions

    Analyst approval 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

The bands are the work and not the plan, which is why week 5 doubles instead of running long.

Phase

W1

W2

W3

W4

W5

W6

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

Week focus

W1Deduction workflow discovery, code mapping and the automation boundary

W2Supplier and claims data connected

W3Evidence binding, confidence logic and approval controls

W4Evidence cases and deduction guardrails

W5Portal integration, pilot deductions and targeted corrections

W6One deduction cycle raised under the buyer, then handover

Reading the band
Bars track named work only. Two phases genuinely share the fifth week.
At the end of W6
Production checks signed, monitoring transferred to Agent Care.
Duration
Six-week plan shown · typical delivery 4–6 weeks depending on scope confirmed in discovery.

Next step · Retail AI agent

Build a deduction agent around the evidence a supplier can ask for.

Show us your deduction rules, the suppliers behind them and who signs one off. Which of the deductions you took last month could you substantiate today, line by line, if the supplier asked?

Typical delivery
4–6 weeks
Deployment
Your supplier systems
Analyst signs
Evidence-first
After launch
Agent Care available

Nestack Agents · Supplier negotiation and deductions

AGT-RT-09 · Agent Care available after launch

Build a deduction agent

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

About you
Your suppliers

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