Customer SuccessManaged AI Agents

Customer Success AI Agents,
Monitored for Quality

Nestack Agent Care helps customer success teams monitor, evaluate, and optimize AI agents used for account health scoring, QBR prep, renewals, and onboarding — before small AI errors become churn or trust issues.

123failure modes
48SEV-1 failure modes
1450+baseline eval cases
24/7Agent Monitoring

Scope

Customer Success AI agents we build & manage

Thirteen archetypes — from health scores to churn-risk outreach and relationship intelligence.

Observability

What we make observable

Every customer-success agent session is traced across ten layers — what we capture and the evidence we keep.

  1. Evidence we keep
    Goalconstraintsapproval requirement
  2. Evidence we keep
    Sourceversiontimestamprelevancecitation
  3. Evidence we keep
    Planned sequenceactual sequenceworkflow status
  4. Evidence we keep
    Task statusresultretryfailure reason
  5. Evidence we keep
    Tool nameversioninputoutputpermissionresult
  6. Evidence we keep
    Model/versioninput/outputtoken usagelatencycost
  7. Evidence we keep
    Evaluation typemetricthresholdresult
  8. Evidence we keep
    Guardrail targettriggeractionenforcement result
  9. Evidence we keep
    Reviewerdecisioncorrectionreason
  10. Evidence we keep
    Outcome statusbusiness resultlinked trace

Catalog

Failure modes

Filter failure modes by where they occur in the agent lifecycle—from goals and retrieval to tools, evaluations, guardrails and outcomes.

Nothing on this page matches that. Try a layer (tool, retrieval, guardrail), a code, or a severity.

0 documented↑↓ move · ↵ open · ⌘↵ filter matrix
123 documented · select a cell to filter
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CSU-01Health-score and account-report hallucinationSEV-2
CSU-02Unauthorized renewal terms, credits or SLA promisesSEV-1
CSU-03Cross-account data leakage in multi-account contextsSEV-1
CSU-04Churn-signal escalation failure — at-risk accounts not flaggedSEV-2
CSU-05Roadmap over-promising — future features stated as commitmentsSEV-2
CSU-06Stale product knowledge after releasesSEV-2
CSU-07Injection via customer emails and shared documentsSEV-2
CSU-08Entitlement and renewal-date errors — wrong end dates, seat counts, tiersSEV-2
CSU-09Mis-personalized outreach at scale — wrong names, products, merge-field leaksSEV-3
CSU-10Meeting-summary errors — commitments and action items dropped or inventedSEV-2
CSU-11Lifecycle-playbook misfires — wrong sequence triggered at the wrong stageSEV-3
CSU-12Health-score feedback loops — agent activity inflating its own score inputsSEV-2
CSU-13Undisclosed AI identity — agent answers as a human with no AI disclosureSEV-1
CSU-14Persistent memory poisoning — corrupted long-term memory surviving sessionsSEV-1
CSU-15Commercial concession drift — unprompted discounting and negotiation exploitationSEV-1
CSU-16Hallucinated restrictive policy — invented constraints triggering cancellationsSEV-1
CSU-17Defamatory account or competitor intelligence — fabricated allegations about named entitiesSEV-1
CSU-18Third-party interception exposure — conversation AI without third-party disclosure (CIPA)SEV-1
CSU-19Non-consensual AI notetaker — meeting bots recording without all-party consentSEV-1
CSU-20Bot doom loop — customers trapped with no human off-rampSEV-2
CSU-21Handoff context evaporation — escalations arrive without history or attempted fixesSEV-2
CSU-22Silent-churn blind spot — deflection metrics score customer give-up as successSEV-2
CSU-23CRM garbage-in at scale — agents act confidently on dirty records fleet-wideSEV-2
CSU-24Context rot on account dossiers — mid-history facts silently dropped from QBRsSEV-2
CSU-25Prior-over-record conflict — model trusts its priors over live account dataSEV-2
CSU-26Metric computation errors — wrong formula or arithmetic on correctly sourced dataSEV-2
CSU-27Retrieval-gap confabulation — knowledge-base gaps answered instead of abstainedSEV-2
CSU-28Sycophantic capitulation — risk assessments flip under pushback or optimistic framingSEV-2
CSU-29False success — agent claims actions completed that never happenedSEV-2
CSU-30Connector outage cascade — playbooks keep acting on frozen or stale synced dataSEV-2
CSU-31Model-update behavior regression — vendor updates silently change agent judgmentSEV-2
CSU-32Multi-agent coordination breakdown — corrupted handoffs and approval-gate bypassSEV-2

A · Account health-score agents

NM-03Silent feed read as live01 · RetrievalSEV-3
NM-04Score raised on thin coverage02 · ReasoningSEV-1
NM-06Weight applied without provenance02 · ReasoningSEV-1
NM-02Thin score passed forward03 · Tool / writeSEV-1
NM-05Score bound to wrong account03 · Tool / writeSEV-2
NM-01Green all quarter, then notice04 · OutputSEV-2
NM-07Silent weighting drift05 · Change / VersionSEV-2

B · QBR & report-prep assistants

NN-03Stale export read01 · RetrievalSEV-3
NN-04Figure asserted, not sourced02 · ReasoningSEV-1
NN-06Comparison chosen to flatter02 · ReasoningSEV-1
NN-02Thin sourcing passed forward03 · Tool / writeSEV-1
NN-05Figure bound to wrong account03 · Tool / writeSEV-2
NN-01Shown, restatement unrecorded04 · OutputSEV-2
NN-07Silent chart carry-over05 · Change / VersionSEV-2

C · Renewal-support agents

NP-03Stale clause read01 · RetrievalSEV-3
NP-04Window counted from renewal02 · ReasoningSEV-1
NP-06Statute applied without basis02 · ReasoningSEV-1
NP-02Contested window passed on03 · Tool / writeSEV-1
NP-05Notice bound to wrong contract03 · Tool / writeSEV-2
NP-01Sent, service unrecorded04 · OutputSEV-2
NP-07Silent calendar drift05 · Change / VersionSEV-2

D · Onboarding copilots

NS-03Customer dependency unlisted01 · RetrievalSEV-3
NS-04Milestone met by a meeting02 · ReasoningSEV-1
NS-06Template forced onto the account02 · ReasoningSEV-1
NS-02Unevidenced go-live passed on03 · Tool / writeSEV-1
NS-05Evidence bound to wrong milestone03 · Tool / writeSEV-2
NS-01Accepted, evidence unrecorded04 · OutputSEV-2
NS-07Silent ownership drift05 · Change / VersionSEV-2

E · Expansion-signal agents

NT-03Stale entitlement read01 · RetrievalSEV-3
NT-04Signal raised on a retry storm02 · ReasoningSEV-1
NT-06Motive asserted, not observed02 · ReasoningSEV-1
NT-02Thin signal passed forward03 · Tool / writeSEV-1
NT-05Signal bound to wrong entity03 · Tool / writeSEV-2
NT-01Ceiling hit, nobody was buying04 · OutputSEV-2
NT-07Silent threshold drift05 · Change / VersionSEV-2

F · Ticket-deflection agents

NV-03Stale article read01 · RetrievalSEV-3
NV-04Answer beyond the source02 · ReasoningSEV-1
NV-06Dispositive request answered02 · ReasoningSEV-1
NV-02Thin answer sent onward03 · Tool / writeSEV-1
NV-05Same article returned again03 · Tool / writeSEV-2
NV-01Handover asked for, not raised04 · OutputSEV-2
NV-07Silent scope drift05 · Change / VersionSEV-2

G · Churn-risk outreach agents

NW-03Departed contact read as live01 · RetrievalSEV-3
NW-04Outreach raised on no reason02 · ReasoningSEV-1
NW-06Live escalation missed by a hold02 · ReasoningSEV-1
NW-02Thin reason passed forward03 · Tool / writeSEV-1
NW-05Message bound to wrong account03 · Tool / writeSEV-2
NW-01Reached after the decision04 · OutputSEV-2
NW-07Silent threshold drift05 · Change / VersionSEV-2

H · Relationship-intelligence agents

NY-03Source not carried over01 · RetrievalSEV-3
NY-04Contact asserted, not sourced02 · ReasoningSEV-1
NY-06Legal person read as a natural one02 · ReasoningSEV-1
NY-02Thin provenance passed forward03 · Tool / writeSEV-1
NY-05Contact bound to wrong account03 · Tool / writeSEV-2
NY-01Used, notice unrecorded04 · OutputSEV-2
NY-07Silent source drift05 · Change / VersionSEV-2

I · Sales-handoff agents

NZ-03Pre-signature call unread01 · RetrievalSEV-3
NZ-04Expansion read as new business02 · ReasoningSEV-1
NZ-06Contract restated as brief02 · ReasoningSEV-1
NZ-02Uncorroborated brief passed on03 · Tool / writeSEV-1
NZ-05Commitment bound to wrong deal03 · Tool / writeSEV-2
NZ-01Surfaced, never decided04 · OutputSEV-2
NZ-07Silent owner departure05 · Change / VersionSEV-2

J · Stakeholder-mapping agents

OA-03Interactions not read01 · RetrievalSEV-3
OA-04Role inferred from a title02 · ReasoningSEV-1
OA-06Single-threading read as depth02 · ReasoningSEV-1
OA-02Thin inference passed forward03 · Tool / writeSEV-1
OA-05Two people merged into one03 · Tool / writeSEV-2
OA-01Departed contact still mapped04 · OutputSEV-2
OA-07Silent evidence drift05 · Change / VersionSEV-2

K · Escalation-summarization agents

OC-03Live thread read as final01 · RetrievalSEV-3
OC-04Salient sentence dropped02 · ReasoningSEV-1
OC-06Quotation softened02 · ReasoningSEV-1
OC-02Wrong reader served03 · Tool / writeSEV-1
OC-05Two escalations merged03 · Tool / writeSEV-2
OC-01Claim with no speaker04 · OutputSEV-2
OC-07Silent softening drift05 · Change / VersionSEV-2

L · Voice-of-customer synthesis agents

OE-03Consent record missing01 · RetrievalSEV-3
OE-04Theme asserted, not sourced02 · ReasoningSEV-1
OE-06Barred purpose read as allowed02 · ReasoningSEV-1
OE-02Thin theme passed forward03 · Tool / writeSEV-1
OE-05Quote bound to wrong customer03 · Tool / writeSEV-2
OE-01Published, source unrecorded04 · OutputSEV-2
OE-07Silent consent drift05 · Change / VersionSEV-2

M · Community-answer agents

OF-03Superseded document read01 · RetrievalSEV-3
OF-04Answer asserted, not sourced02 · ReasoningSEV-1
OF-06Badge omitted from the draft02 · ReasoningSEV-1
OF-02Thin answer passed forward03 · Tool / writeSEV-1
OF-05Answer bound to wrong thread03 · Tool / writeSEV-2
OF-01Posted, badge unrecorded04 · OutputSEV-2
OF-07Silent badging drift05 · Change / VersionSEV-2

Guardrails

Critical guardrails for Customer Success agents

Ten controls that hold regardless of prompt, plan or pressure. Open one to see what it protects, what trips it, what the agent is forced to do, who may release it, and what is written to the record.

GR-01No renewal, credit or SLA beyond delegated mandateOverride defined
  1. Target

    Renewal quotes, credit memos, SLA language and discount terms in customer communications.

  2. Trigger

    Draft terms exceeding the CSM’s mandate table or any unprompted concession mid-negotiation.

  3. Action — enforced

    Platform blocks the send, strips the unauthorised terms, and routes the draft to the account owner for approval.

  4. Human override

    Regional CS director via signed mandate exception in the CPQ system.

Logged evidenceaccount id · drafted terms · mandate table version · approver identity · final sent text hash

GR-02No cross-account retrieval in multi-account sessionsNo override
  1. Target

    CRM records, health scores, usage data and documents scoped to a single account context.

  2. Trigger

    Any retrieval or citation referencing an account outside the active session binding.

  3. Action — enforced

    Platform denies the query, purges out-of-scope fragments from context, and continues on the bound account only.

  4. Human override

    None — cannot be overridden in session

Logged evidencesession id · bound account id · denied query hash · source account id · timestamp

GR-03No instruction embedded in customer emails or shared documents executedNo override
  1. Target

    Inbound customer emails, shared decks, tickets and meeting notes ingested into account context.

  2. Trigger

    Directive text detected in ingested customer content, including hidden text and file metadata.

  3. Action — enforced

    Platform treats the content as data only, quarantines the artifact, and blocks writes to long-term memory stores.

  4. Human override

    None — cannot be overridden in session

Logged evidenceartifact hash · payload excerpt · sender identity · quarantine id · memory-write block record

GR-04No customer interaction without AI self-identificationOverride defined
  1. Target

    Chat, email and voice touchpoints where the agent answers on behalf of the CS team.

  2. Trigger

    First customer contact in any channel lacking the standing AI disclosure banner or script.

  3. Action — enforced

    Platform injects the disclosure before delivery, blocks human-impersonation phrasing, and records disclosure delivery per EU AI Act Art. 50.

  4. Human override

    CS operations lead via approved channel script that retains the disclosure.

Logged evidenceconversation id · channel · disclosure timestamp · script version · first-response hash

GR-05No meeting capture without all-party consentOverride defined
  1. Target

    AI notetakers and conversation-intelligence bots joining customer calls and QBRs.

  2. Trigger

    A recording or transcription attempt without logged consent from every participant.

  3. Action — enforced

    Platform blocks the bot from joining, disables transcription, and issues the consent request to all participants first.

  4. Human override

    Meeting host via recorded consent confirmation captured for each participant.

Logged evidencemeeting id · participant list · consent timestamps · recording state · jurisdiction rule applied

GR-06No unverified write to persistent account memoryOverride defined
  1. Target

    Long-term memory, account dossiers and health-score inputs surviving across sessions.

  2. Trigger

    A memory write sourced from unverified customer content or a single unconfirmed session.

  3. Action — enforced

    Platform stages the write in quarantine, requires source verification against CRM records, and expires unconfirmed entries automatically.

  4. Human override

    CS operations manager via source-verified promotion in the memory console.

Logged evidenceentry id · source hash · verification result · promotion approver · expiry timestamp

GR-07No roadmap commitment beyond published release notesOverride defined
  1. Target

    Feature timelines, QBR decks and renewal conversations referencing unreleased product capability.

  2. Trigger

    Draft text stating a future feature, date or capability as a firm commitment.

  3. Action — enforced

    Platform rewrites the claim to published-roadmap language, blocks dates absent from release notes, and flags the draft to product marketing.

  4. Human override

    Product marketing lead via written commitment approval attached to the account.

Logged evidencedraft hash · claimed feature · roadmap version · rewrite diff · approver identity

GR-08No policy cited without a versioned policy sourceOverride defined
  1. Target

    Cancellation terms, notice periods, entitlements and usage policies quoted to customers.

  2. Trigger

    A policy claim that fails retrieval matching against the current policy library.

  3. Action — enforced

    Platform withholds the answer, states the gap explicitly, and escalates the question to a named policy owner.

  4. Human override

    Policy owner via publication of the clause in the policy library.

Logged evidencequery text · retrieval result · policy id and version · abstention record · escalation ticket

GR-09No allegation about named accounts or competitors without recordsOverride defined
  1. Target

    Account briefings, win-loss notes and competitor intelligence naming real entities or people.

  2. Trigger

    A factual claim of misconduct, instability or failure lacking a citable system record.

  3. Action — enforced

    Platform strips the unsupported claim, marks the section unverified, and requires a cited source before redistribution.

  4. Human override

    CS insights lead via attached source citation reviewed for accuracy.

Logged evidencedocument id · flagged claim · citation check result · editor identity · redistribution status

GR-10No conversation loop without a human off-rampOverride defined
  1. Target

    Automated success flows, deflection playbooks and churn-risk escalation queues.

  2. Trigger

    Repeated contact, frustration signals or an at-risk score without an offered human handoff.

  3. Action — enforced

    Platform forces a staffed escalation option, transfers full conversation history, and blocks deflection metrics from counting the close.

  4. Human override

    CS operations lead via documented off-ramp policy change, never per conversation.

Logged evidenceconversation id · contact count · escalation offer timestamp · handoff transcript id · owning CSM

Oversight

Human review — triggers, decisions and evidence

When a defined risk trigger fires, the affected action is routed to a named reviewer. Every decision is recorded with its correction, escalation and final outcome for full traceability.

  • ConfidenceLow-confidence health score
  • Financial impactCredit or renewal terms
  • Identity / change riskAccount or entitlement change
  • Irreversible actionRenewal or cancellation action
  • Policy riskRoadmap or SLA commitment
  • Safety controlGuardrail override
  • Quality failureFailed critical evaluation
Humanreviewnamed reviewer
  • Revieweridentity + role
  • Decisionapprove / reject / amend
  • Correctionwhat changed
  • Escalationwho, why and severity
  • Final outcomereleased / blocked / returned for rework

7 triggers · any one halts the agent

1 record · 5 fields, every time

Compliance

Regulatory mapping

  • 01 Goal
  • 02 Retrieval
  • 03 Workflow
  • 05 Tool
  • 07 Evaluation
  • 08 Guardrail

Contract governance

Renewal terms, credits and SLAs beyond authority are revenue leakage with a signature.

Lifecycle layer:01 Goal · 07 Evaluation · 08 Guardrail

  • CSU-02

Evaluations

Baseline evaluation suite — in detail

Baseline evaluations are completed during onboarding and repeated based on the selected plan. Agents that fail critical checks remain restricted until they pass re-testing.

Detailed case sets
70
Failure modes covered
32
Retired & rotated / quarter
10%
Audit-ready scorecard
Monthly

Output evaluation5 suites · 240 cases

80 casesChurn-signal recallcatches CSU-04
40 casesPersonalization QAcatches CSU-09
40 casesSilent-churn detectioncatches CSU-22
40 casesAssessment stabilitycatches CSU-28
40 casesBehavioral regressioncatches CSU-31

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  1. Department lead review

    For applicable high-risk agents, the client’s designated department leader reviews the evaluation criteria and pass thresholds before baseline approval.

  2. Test-case rotation

    Evaluation cases are refreshed regularly to reduce memorisation and maintain reliable performance measurement.

  3. Scorecard integration

    Scorecards track results against the approved baseline and flag material declines for review and escalation.

  4. Department-specific extensions

    Where included in scope, evaluations may be expanded using approved workflows, tools, templates, policies, and incident history.

Monitoring

Change-aware monitoring

When agent performance changes, Nestack correlates the shift with changes to the agent, prompt, model, tools, knowledge base, guardrails and evaluation suite.

Version changes by layer
01AgentAgent changed in week 4Agent changed in week 11
02PromptPrompt changed in week 6
03ModelModel changed in week 3
04ToolTool changed in week 8Tool changed in week 10
05Knowledge-baseKnowledge-base changed in week 7
06GuardrailGuardrail changed in week 5Guardrail changed in week 12
07Eval-suiteEval-suite changed in week 10
Grounded-answer rate92–100%
  • Week 1 · 98.1%
  • Week 2 · 98.0%
  • Week 3 · 98.2%
  • Week 4 · 98.1%
  • Week 5 · 98.3%
  • Week 6 · 98.1%
  • Week 7 · 98.2%
  • Week 8 · 93.8%
  • Week 9 · 93.6%
  • Week 10 · 98.1%
  • Week 11 · 98.2%
  • Week 12 · 98.3%

Week readouthover or select

Week 8of 12

  • 04Tooltools 11.3

93.8%Grounded-answer rate

  • 7 layers stamped on every run · 12-week window
  • Catches CSU-30 · connector outage cascade

Something missing?

Don’t see your agent’s issue here?

Every AI environment is different. Share what you’re seeing, and we’ll review the behaviour, assess the risk and recommend the evaluations or controls that may help.

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Tell us what you’re seeing

The more specific, the faster we can reproduce it. Playbook: Customer Success

We reply within one business day.

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Process

Universal incident runbook

Severity is assigned based on business impact, customer harm, data exposure, operational disruption and overall scope.

  • SEV-1 Critical
  • SEV-2 Major
  • SEV-3 Moderate
  • SEV-4 Minor
STEP 01

Automated monitoring or human review identifies unusual behaviour. Alerts are recorded and routed according to severity.

Cost control

Keep customer success AI agent costs under control

Token spend is monitored, optimised and reported as part of Agent Care — and savings never come at the expense of quality, because every change is verified against your evaluation baseline.

We review token spend by agent, workflow, model, and session so you can understand where AI costs are coming from.

Running customer success AI agents in production?

Get a free assessment of one agent. We’ll review its behaviour, run a baseline evaluation and highlight potential risks and performance gaps.

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