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Advertising AI agent · Copy generation

Campaign Copy-Generation AI Agent

Draft headlines, descriptions and body copy against the brief, the brand voice and the approved claims library, then route every claim to the person who clears it — copy runs after that, not before.

Typical delivery
4–6 weeks
Deployment
Your stack
Claim sign-off
Named approver
After launch
Agent Care

What this agent does

Drafts the copy, never clears the claim

In

  1. 01

    Read the brief, the brand voice guide and the approved claims library, with what each claim is held on.

  2. 02

    Take the placement, format and character limit from the platform the copy is being written for.

Reason

  1. 03

    Draft headlines, descriptions and body copy, and tie every claim in the draft to a named entry in the library.

  2. 04

    Build the variants a test needs, and check each one still carries its disclosure inside the character limit.

  3. 05

    Localise into the target market's language and its claim rules, rather than translating the approved wording.

Decide

  1. 06

    Hold anything comparative, superlative, or resting on a claim with nothing on file behind it.

  2. 07

    Route every draft to the named brand and legal reviewers before it reaches an ad platform.

Out

  1. 08

    Hand the reviewer the draft, the claims it relies on and the substantiation reference for each one.

  2. 09

    Retain the brief version, the claim entries used, the reviewer's edit and where each variant ran.

Product statement

The agent drafts against an approved claims library. It does not clear a claim, and no copy it writes runs until a named reviewer has signed it.

Example workflow

One brief, end to end

  1. 1Brief receivedA campaign brief, an audience, a placement and the market the copy is for
  2. 2Claims and voice loadedThe approved claims library with its substantiation references, the brand voice guide and the category's rules
  3. 3Copy draftedHeadlines, descriptions and body copy per placement, each claim tied to the library entry it came from
  4. 4Constraints appliedCharacter limits, disclosure retention, prohibited terms for the category, and the platform's own policy

No human action required

Stages 1 to 4 run without a person in the loop — the draft, its claim references and the platform checks are finished before a reviewer is asked to open anything.

5DecisionSplits on claim grounding and category risk
Every claim grounded

Reaches the reviewer ready to sign.

Claim unsupported or comparative

Held with the line named, not published.

Brand and legal reviewers

Brand checks voice and category fit; legal clears each claim against the substantiation on file, then releases the copy.

Approve · Edit the claim · Send back

Approved — handed back

  1. 6Cleared and publishedThe named reviewers sign the claim; the copy reaches the ad platform after that, on the accounts they approved
  2. 7Outcome evaluatedClaim grounding, disclosure retention, reviewer edits, platform rejections and prohibited-term recall by category

Reviewer edits

Every claim a reviewer rewrites or strikes is counted, by category.

What should not run autonomously

Human approval stays in control

Outside the boundary — human approval required

8 items

  • Clearing a claim for publication.
    • Any comparative claim naming a competitor.
    • Superlative and market-leading claims.
    • Adding a claim the library does not hold.

  • Automation boundary

    Agent acts unaided

    • ✓Draft copy against the brief, the voice guide and the claims library.
    • ✓Build platform variants inside each format's character limit.
    • ✓Flag drafts whose claims have nothing on file, and name the line.
    • ✓Localise into the target market and hold what its rules do not allow.

    Write actions run only inside the approval boundaries agreed during implementation. Clearing a claim and publishing are not among them.

    • Health, financial, alcohol and child-directed copy.
    • Shortening or removing a required disclosure.
    • Testimonial, endorsement and review content.
  • Changing voice rules, prohibited terms or claim entries.

Example output

One draft, annotated

Everything the agent writes is attached to the claim entry it rests on.

Copy output · one placement

Illustrative example
Brief
Product launch, paid search
Placement
Search, headline slot
Library
Read today
Draft
Held for legal
Confidence
82%
Disclosure
Retained in full

As received

Taken from the brief and the library as they stood — nothing on this side is inferred.

Evidence used

  • Claim entry, dated
  • Brand voice guide
  • Category rule set

Why it is held

A headline implies a comparison the brief never made, with nothing on file.

What the score decides

It decides how closely a reviewer reads the draft, not whether the claim is defensible.

Action

ApproveEdit the claimSend back

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 brief

From the campaign brief and the voice guide

03Claims & voice

Write from the claims that exist

Draft against the approved claims library and the brand voice guide, with each line tied to the substantiation reference behind it.

01Approved path

Take the drafting off the queue

Placement variants, character limits and locale versions are produced before a reviewer opens the file, so review is reading rather than writing.

02Human review

Surface the claim before it runs

A line with nothing on file behind it is held now, rather than found later by a platform rejection, a competitor's counsel or a regulator.

04

Build an evidence trail

Retain the brief version, the claim entries used, the substantiation references, the reviewer's edit and where each variant ran — on both paths.

Integrations

Typical integrations

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

  • Brand & claims libraries

    • Claims library
    • voice guide
    • Veeva PromoMats
    • category rules

  • Assets & campaigns

    • Adobe Experience Manager
    • Bynder
    • Frontify
    • campaign calendars

  • Ad platforms & policy

    • Google Ads
    • Meta
    • Amazon Ads
    • DV360
    • platform policy APIs

Agent

Campaign copy generation

  • Reads the brief
  • Drafts from claims
  • Holds what is unsupported

  • Localisation & review

    • Smartling
    • Phrase
    • Adobe Workfront
    • Ziflow
    • legal review queues

  • 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 ad platform

Each control wraps the one inside it. A draft clears every layer before it is published, and none of them stands in for the person who signs the claim.

L6 · Outermost — last line of defence

Inward → L1 · closest to the model

L6Rollback / safe modeReturn drafting to the team if evaluations or rejections degrade.Roll back
L5TraceabilityRecord brief version, claim entries, reviewer edits and where copy ran.Record
L4Review gateNo draft reaches an ad platform until a named reviewer clears the claim.Gate
L3Disclosure retentionA required disclosure survives the character limit, or the variant is not offered.Retain
L2Category rulesProhibited terms for health, financial, alcohol and child-directed copy.Restrict
L1Claim groundingEvery claim resolves to an entry in the approved library.Ground
Model coreDraft — headlines, descriptions, body copy, the claims used and confidence
L1 – L2
Decide whether the claim may be written
L3
Decides whether the variant may ship
L4 – L5
Put a name on the release and keep the trail
L6
Pulls automation back when signals degrade

How Nestack evaluates it

Evaluate the claim, not only the copy.

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

Surface — the draft a reviewer opens

  1. E1Claim substantiationDoes every claim in the draft resolve to an entry on file?
  2. E2Step-level evaluationDid it read the current brief, voice guide and category rule set?
  3. E3Constraint retentionDo disclosures survive the character limit, and are the variants actually different?
  4. E4Brand-voice adherenceDoes someone from the brand team rate the copy as on voice?
  5. E5Slice evaluationHow does performance change across categories, platforms and locales?
  6. E6Business outcomeReviewer edits, platform rejections and claims pulled after clearance.

Floor — the claim that holds up after it runs

Failure modes

Where each failure originates in the agent

Seven failure modes plotted against the five stages of the agent lifecycle.

Agent lifecycle

Direction of processing →

  1. 01 · Brief & claims

    1 mode

    • CG-01

      Retired claim still in use

      Drafted from an entry legal has withdrawn.

    Stage reads

    Brief, voice guide, claims library and category rules

  2. 02 · Drafting

    2 modes

    • CG-02

      Unsupported superlative

      A best-in-market line no evidence supports.

    • CG-03

      Unauthorised implied claim

      Copy suggests a benefit the brief did not make.

    Stage proposes

    Headlines, descriptions, body copy and variants

  3. 03 · Constraints

    2 modes

    • CG-04

      Comparison with no evidence

      Clears the term check with no test on file.

    • CG-05

      Disclosure lost to length

      A required qualifier is dropped to make length.

    Stage checks

    Character limits, disclosures and prohibited terms

  4. 04 · Locale & release

    1 mode

    • CG-06

      Localisation moves the claim

      The translated line asserts more than the source.

    Stage routes

    Only to the reviewer and account a person approved

  5. 05 · Change / Version

    1 mode

    • CG-07

      Silent voice drift

      A prompt or model change moves tone unnoticed.

    Stage tracks

    Model, prompt, voice-guide and claims-entry changes

  • Sev-1 · a claim runs with nothing behind it
  • Sev-2 · the copy says more than was approved
  • Sev-3 · quality drifts, review absorbs it
See the complete Advertising failure-mode catalogue

Affected slices

The risk is not spread evenly across categories

Aggregate review-edit rates can look acceptable while a few categories carry nearly all of the unsupported claims, the held drafts and the escalations to legal. Nestack reports performance by slice, not only in total.

Slice performance — reported separately, not only in aggregate

Illustrative example
SliceFailure rateLiftLift vs. thresholdStatus
Health and supplement copy5.3%3.5×Review
Comparative and superlative lines3.6%2.4×Review
Localised non-English variants2.9%1.9×Watch
Approved boilerplate brand copy0.8%0.5×Normal

Bar: failure-rate lift vs. approved-boilerplate baseline · scale 0–4.0× · tick marks the 2.0× review threshold

2 of 4 slices over threshold

Evidence-linked improvement

The fix usually belongs to the claims library, not the prompt

Most drafts held for legal are held because the library is thin, stale or silent on the claim the brief asked for, not because the model wrote badly.

Improvement cycle · five stages

Switchback — the path turns at Improve and returns at Learn

  1. 01

    Detect

    Held drafts, reviewer edits or platform rejections rise in one category or locale.

  2. 02

    Diagnose

    Traced to a missing claim entry, a stale one, a voice rule or the prompt.

  3. 03

    Improve

    The entry, rule or prompt is corrected, re-approved by legal or brand, and version-linked.

  4. 04

    Verify

    Re-run against held-out briefs from that category, including the lines legal struck.

  5. 05

    Learn

    The struck line becomes a regression case and the library entry gains its source.

  6. Learn → Detect

    The return edge. Every cycle also re-dates the claims the agent may write from — cleared last quarter is not cleared now.

Typical build scope

Twelve workstreams across six weeks

The build scope read against the delivery timeline. Week structure follows the six-week plan — discovery, claims and voice, drafting and constraints, evaluation, localisation and platform, then production validation and handover.

Workstream

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

  1. 01Workflow discovery and automation-boundary definition.Week 1
  2. 02Brand voice and prohibited-term capture.Week 1, Week 2
  3. 03Approved claims library and substantiation mapping.Week 1, Week 2
  4. 04Brief ingestion and campaign context.Week 2
  5. 05Copy drafting and claim-to-entry grounding.Week 2, Week 3
  6. 06Platform variants and disclosure checks.Week 3
  7. 07Regulated-category rule sets.Week 3, Week 4
  8. 08Legal and brand review workflow.Week 4
  9. 09Evaluation suite and regression briefs.Week 4, Week 5
  10. 10Localisation and in-market claim review.Week 5
  11. 11Ad-platform policy checks and publishing.Week 5, Week 6
  12. 12Observability, deployment 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 brand, one platformProductionLive campaign integrationAdvancedMulti-brand / multi-market
Introduced at Pilot
Copy drafting from a brief✓✓✓
Claim-to-library grounding✓✓✓
Named-reviewer sign-off✓✓✓
Baseline evaluation✓✓✓
Introduced at Production
Brand voice and prohibited terms—✓✓
Platform variants and disclosure retention—✓✓
Category rule sets—✓✓
Review workflow and observability—✓✓
Introduced at Advanced
Localisation and in-market review——✓
Ad-platform policy checks——✓
Multi-brand and enterprise controls——✓
Build priceFrom $5,000From $8,000Custom quote
Final build price
Confirmed after discovery based on brands and markets in scope, the state of the claims library, platform integrations, regulated categories, review 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 approved claims and what backs each one

    Approved claims library and substantiation mapping

    Week 1

  2. 02The brand voice guide and your prohibited-term list

    Brand voice, tone rules and prohibited-term capture

    Week 1

  3. 03Representative briefs and the copy you have run

    Brief ingestion, campaign context and the drafting baseline

    Week 2

  4. 04The regulated categories you advertise in

    Category rules — health, finance, alcohol, children

    Week 3

  5. 05Copy legal has struck out, and the reason given

    Evaluation suite, regression briefs and slice testing

    Week 4

  6. 06Named brand and legal reviewers, and who publishes

    Legal and brand review workflow, and the release gate

    Week 4

  7. 07Ad-platform access and your target markets

    Platform policy checks, localisation and in-market review

    Weeks 5–6

Nothing else is required

Deployment, documentation and Agent Care handover are ours.

Delivery timeline

Four phases across six weeks

Phases are drawn over the weeks they actually occupy. Week 5 carries both the localisation work and the first drafts going out under review.

Phase

W1

W2

W3

W4

W5

W6

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

Week focus

W1Claims library, brand voice and who clears a claim

W2Brief ingestion, drafting baseline and claim grounding

W3Platform variants, character limits and category rules

W4Review workflow, evaluation suite and category slices

W5Localisation, in-market review and platform policy checks

W6Live copy published under review, then Agent Care monitoring

Reading the band
The claims library is mapped in week 1, before a line is drafted in week 2. The bars show that dependency, not a smooth ramp.
At the end of W6
Copy has run under review and a named person has cleared every claim, then Agent Care takes over monitoring.
Duration
Six-week plan shown · typical delivery 4–6 weeks depending on scope confirmed in discovery.

Next step · Advertising AI agent

Build a copy-generation agent around your claims library.

Show us a live brief, the claims you are allowed to make and who signs one off today. We'll take one brand and one platform through to a cleared draft, and name what the library cannot support yet.

Typical delivery
4–6 weeks
Deployment
Your martech and ad stack
Claim sign-off
Named approver, always
After launch
Agent Care available

Nestack Agents · Campaign copy generation

AGT-AM-01 · Agent Care available after launch

Build a copy-generation agent

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

About you
Your setup

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