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Freedom251 › Blog › agent observability

How to Monitor AI Agents for Unexpected or Harmful Actions

By Freedom251 Team · · 13 min read

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Monitor an AI agent as an operational system, not just as a chatbot. Record who or what authorized it, which tools it called, what state it changed, whether each step matched its approved goal, and what happened afterward. Combine those records with runtime health signals, privacy safeguards, alert rules, and a staffed way to pause or contain the workflow.

Detection is not a substitute for limiting authority. Give an agent only the permissions and tools it needs, enforce authorization in downstream services, and require human confirmation for consequential changes. NIST’s 2026 AI 800-4 report notes that controlled pre-deployment tests cannot reveal every behavior that will appear under real-world conditions, while post-deployment monitoring exposes unexpected outputs and consequences. Monitoring methods and shared terminology are still developing, so thresholds and controls must fit the agent’s authority, impact, reversibility, legal duties, and operating environment.

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What monitoring must answer

A useful monitoring program should let an investigator answer five questions for any significant action:

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  1. Who acted? Identify the agent, its owner or authorizing principal, the model and version, the session or workflow, and the permissions in force.
  2. What did it try to do? Record the tool or API, the operation, relevant parameter types, the stated objective, and the policy or approval that applied.
  3. What actually happened? Capture the result, downstream state change, error, retry, approval or rejection, and any interaction with another agent or service.
  4. Was it within scope? Compare the sequence with the approved goal, allowed data, tool set, rate limits, and business rules.
  5. What should happen now? Route an alert to a named person or team that can pause, revoke, roll back, or escalate the workflow.

Chat transcripts alone cannot answer these questions. The important evidence is usually in tool calls, authorization decisions, system-of-record entries, memory access, and the chain of actions over time.

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Build an observability model around the whole agentic system

Monitor each agent and the environment around it. The Australian Government’s guidance describes coverage that includes action sequences, inter-agent interaction, tools, memory, environment changes, and performance. A central control tower can be one governance layer for inventory, risk, security, cost, compliance, dashboards, traces, and audit reports; it is an architectural option, not a universal requirement.

Signal family Capture Examples of concern Useful response
Identity and authorization Agent identity, owner, authorizing principal, role, token or session identifier, permission changes, and policy version Impersonation, a newly granted privilege, use of a dormant identity, or a request outside the owner’s authority Revoke or narrow access, re-authenticate, and investigate configuration drift
Tools and actions Tool or API name, operation, timestamp, outcome, approval status, parameter types, and consequential state changes Unexpected tool, unusual sequence, repeated writes, destructive operation, or action after denial Block the call, require confirmation, and compare with the downstream system log
Goal and policy adherence Approved objective, permitted scope, workflow rules, agent plan or rationale where retained, and observed sequence Goal drift, unapproved data access, or a stated intention that does not match behavior Pause the workflow and have an owner review the objective and policy
Inputs and memory Source and trust level of inputs, retrieved records, memory reads and writes, freshness, and access decisions Prompt injection, poisoned records, stale instructions, memory leakage, duplication, or unauthorized retrieval Quarantine the source or memory item, invalidate affected context, and re-run from a trusted baseline
Runtime health Tool errors, latency, retries, token or CPU use, queue depth, fallbacks, and timeouts Runaway loops, retry storms, cost spikes, service degradation, or repeated fallback behavior Apply rate and retry limits, shed work, and inspect the action trail
Outputs and effects Responses, generated artifacts, security events, data-drift or bias indicators, compliance events, and downstream impact Unexpected disclosure, unsafe content, inaccurate record update, or a harmful effect on a customer or system Hold publication, correct or roll back state, notify affected owners, and preserve evidence

A resource anomaly by itself does not prove harmful intent. High token use may result from a legitimate large job; it becomes more concerning when it coincides with repeated failed calls, scope violations, or unauthorized state changes.

Control authority before depending on detection

Monitoring is a second line of defense. OWASP guidance for agent security warns against relying on a language model to decide whether an action is allowed. Every downstream service should validate the request against the authenticated principal, resource, operation, and current policy.

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Use least privilege and narrow tools

  • Inventory every tool, data source, write operation, and network destination an agent can reach.
  • Grant read-only access by default. Add a write capability only for a specific workflow step.
  • Separate identities for development, testing, and production, and avoid sharing long-lived credentials.
  • Restrict the resources a tool can address, not merely the tool name. A database-read tool should still be limited to approved tables or rows.
  • Recheck permissions when a workflow crosses a service boundary or changes a resource.

Bound rate, retries, and chains

Set maximum calls per minute, total calls per task, retry counts, token or compute budgets, execution time, and chain depth. These limits reduce damage from loops, duplicated actions, and prompt-induced escalation while an alert is being investigated. They should be enforced by a gateway or service layer rather than left to the model’s discretion.

Prefer reversible operations

Design a delete as a recoverable archive where feasible, stage a publication as a draft, and make financial or configuration changes transactional. Record the identifier needed for an undo operation. Reversibility lowers expected impact but does not eliminate the need to monitor or approve the action.

Put human checkpoints on consequential changes

The Government of Canada’s Guide on the Use of Agentic Artificial Intelligence gives a clear design rule: “When an AI agent’s action alters a system’s state (send, publish, approve, spend, update records), include a review/confirmation step in the design, unless the expected impact is demonstrably low and the action is trivially reversible.”

Classify actions by impact and reversibility

Action class Typical examples Recommended gate
Observation Read a permitted record, calculate a report, or check a status Automated execution with logging and scope checks
Low-impact, reversible Create a draft, add a non-public tag, or queue a disposable test job Automated execution if the owner has approved the policy; retain an undo path
Consequential Send, publish, approve, spend, update a record, change access, or contact an external party Human confirmation unless low impact and trivially reversible are both demonstrated
High-impact or hard to reverse Delete data, transfer funds, alter production security controls, or make a decision affecting rights or eligibility Explicit approval by an accountable person, separation of duties where appropriate, and enhanced audit evidence

Make approval meaningful

Show the reviewer the exact target, proposed operation, affected records or amount, relevant input sources, policy basis, and expected side effects. Do not present a vague “approve plan” button when the agent can continue to change the plan after approval. Bind approval to a specific operation, expiration time, and identity. If the request changes materially, require a new approval.

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Staff the intervention path

An approval gate that nobody watches is not a control. Define business hours, on-call coverage, escalation time, and who can pause or revoke the workflow. Test that a reviewer can deny an action and that the agent cannot simply retry through another tool or identity.

Capture an interpretable, privacy-aware action record

For each meaningful event, store enough structured context to reconstruct what happened without turning the log into a copy of every secret or personal record.

Recommended event fields

  • Unique event ID, workflow or session ID, agent ID, model and configuration version, and environment.
  • Owner or authorizing principal, authenticated identity, role, and policy version.
  • Timestamp with a consistent clock, tool or API name, operation, target class, and parameter types.
  • Approval state, approver identity, approval time, and whether the operation changed after approval.
  • Outcome, downstream response code, resulting state-change identifier, retry count, and error details.
  • Relevant input and output excerpts, hashes, references, or classifications sufficient for investigation.
  • Links to independent system-of-record events, such as the database audit entry or payment ledger ID.

The Canadian guidance recommends logging raw parameter values only when they are needed for oversight, security, or program integrity and only under applicable privacy and security controls. Prefer structured classifications, redacted excerpts, hashes, or references when the exact value is unnecessary.

Protect the monitoring data

  • Do not store passwords, API keys, session tokens, or personal data in plaintext. OWASP’s agent security cheat sheet specifically warns about sensitive-data logging.
  • Apply separate access controls to logs, with least privilege and a recorded reason for sensitive searches.
  • Encrypt logs in transit and at rest, protect their integrity, and restrict deletion.
  • Set retention by investigation, legal, privacy, and operational need; avoid indefinite collection by default.
  • Test redaction against nested tool arguments, error messages, model outputs, and memory snapshots.
  • Document what is intentionally omitted so an investigator knows the limits of the evidence.

Detect behavior that is unexpected or harmful

Scope and authorization violations

Alert when an agent calls a tool outside its allow-list, accesses a resource outside its tenant or project, uses a privilege granted after the workflow began, or acts for a principal it cannot represent. A denied request followed by a similar request through another connector is a stronger signal than a single denial.

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Sequence anomalies

Many harmful behaviors are sequences rather than individual calls: read sensitive data, export it, create an external message, then delete evidence. Baselines should consider order, frequency, target, and time between calls. Compare the observed sequence with approved workflow graphs where those exist, and flag unusual paths for review rather than treating every deviation as proof of abuse.

Goal drift and policy mismatch

Compare the active task with the approved objective and permitted scope. Flag actions that cannot be justified by the objective, a change in target or audience, unexplained expansion of data access, or a discrepancy between the agent’s stated intention and the downstream record. A model-generated explanation is evidence to review, not an authorization decision.

Injection and memory poisoning

Mark inputs by trust level and origin. Watch for instructions embedded in retrieved documents, web content, tickets, emails, or tool results that attempt to override policy, reveal secrets, or redirect the task. Monitor memory writes for unexpected authors, excessive duplication, stale instructions, and sensitive data that was not permitted for persistence. Quarantine suspicious memory and require a trusted reinitialization instead of silently continuing.

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Runtime and cost anomalies

Set baselines for latency, retries, token or CPU use, tool failure rates, and fallback frequency. A sudden increase may indicate a loop, unavailable dependency, malformed output, or adversarial input. Pair operational alerts with action and authorization data so responders can distinguish a harmless large job from a runaway workflow.

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Output and downstream impact

Inspect outputs according to the use case: data leakage, unsafe instructions, inaccurate updates, biased outcomes, policy violations, security events, and customer or system impact. Monitor both the generated artifact and what a connected service actually accepted. A blocked output is not the same as a harmful state change; downstream records are the authoritative check.

Design alerting that leads to action

Use layered rules and baselines

Start with deterministic rules for forbidden tools, resources, identities, data classes, and state changes. Add statistical or behavioral baselines for unusual sequences, rates, latency, and costs. Add goal or policy comparison where the workflow has a machine-readable objective. Independent checks should be able to disagree with the agent’s own account.

Prioritize alerts by impact

Priority Trigger pattern Immediate handling
Critical Unauthorized high-impact change, credential exposure, destructive action, or active data exfiltration Pause or revoke access immediately, preserve evidence, and invoke incident response
High Scope violation, repeated denied calls, suspicious sequence, or unapproved publication or spending attempt Stop the workflow, require owner review, and validate downstream state
Medium Goal deviation, memory anomaly, unusual retry pattern, or significant cost or latency shift Throttle or isolate if needed, investigate context, and tune controls
Low Minor baseline deviation with no sensitive access or state change Record for trend analysis and review during normal operations

Measure alert quality

Track how many alerts are actionable, how long it takes to acknowledge and contain them, which events were missed, and how often reviewers overturn a rule. Sample successful workflows for undetected deviations. A low alert count can mean a safe system, weak instrumentation, or thresholds that are too permissive; it is not a success metric by itself.

Incident response for a suspected harmful action

There is no single universal response sequence, but the following order preserves options while limiting further damage.

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  1. Stabilize. Pause the agent, disable the affected tool, revoke a token, or reduce permissions. Choose the narrowest containment that stops ongoing harm.
  2. Preserve evidence. Save event records, approvals, configuration and policy versions, memory references, model and tool versions, and downstream system logs. Record who performed containment and when.
  3. Cross-check. Compare the agent’s activity with the independent system of record. Confirm what was attempted, accepted, rejected, or actually changed.
  4. Assess scope. Identify affected identities, data, systems, customers, and time window. Check whether another agent or automation continued the sequence.
  5. Recover safely. Roll back reversible changes, correct records, rotate exposed credentials, quarantine poisoned inputs, and restore from a trusted configuration.
  6. Escalate and notify. Follow the organization’s security, privacy, legal, safety, and continuity procedures. Notify affected owners when required.
  7. Learn and retest. Fix the permission, policy, prompt, tool, memory, or deployment condition that enabled the event. Re-run normal, edge-case, and adversarial tests before expanding access.
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A practical rollout sequence

Use this sequence when introducing monitoring or extending an existing program.

  1. Inventory. List agents, owners, model and configuration versions, tools, data sources, identities, environments, and state changes.
  2. Define scope. Write the permitted objective, resources, rate and retry limits, prohibited actions, and consequential-action approval points.
  3. Instrument. Emit structured events for identity, authorization, tool calls, decisions or actions, approvals, outcomes, state changes, memory access, and essential runtime signals.
  4. Set privacy rules. Classify fields, redact secrets and unnecessary personal data, restrict log access, and define retention before collecting production data.
  5. Create detections. Implement deterministic scope rules, sequence and goal-drift checks, memory and input checks, and runtime baselines. Route each alert to an accountable owner with pause authority.
  6. Test recovery. Exercise normal use, realistic edge cases, adversarial inputs, denied approvals, tool outages, retries, and rollback. Verify that alerts arrive and containment works.
  7. Deploy gradually. Begin with limited users, data, tools, or read-only mode. Review missed events and unnecessary alerts, then expand only when the oversight path can scale.
  8. Reassess after change. Repeat relevant testing and review whenever prompts, models, tools, memory, permissions, policies, or operating conditions change.

This sequence synthesizes recommendations from NIST AI 800-4, the Canadian agentic-AI guide, Australian Government guidance, and OWASP security guidance; it is not a universal certification checklist.

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How to evaluate monitoring platforms or internal tooling

Whether you buy a product or build an internal service, compare capabilities against the risks of your deployment rather than counting dashboard features.

Evaluation axis Questions to ask
Coverage Does it observe tool calls, state changes, memory, agent-to-agent interaction, connected systems, and the independent system of record?
Context Can every event be tied to an agent, authorizing human, identity, policy, objective, approval, and workflow?
Detection and response Can it enforce scope rules, detect sequence or goal deviation, alert in real time, and invoke a pause or containment hook?
Auditability Are events immutable or tamper-evident, searchable, exportable, and comparable with downstream logs?
Privacy Can you redact sensitive values, control access, set retention, and prove that secrets are not being logged?
Integration Does it fit existing identity, observability, security information, ticketing, and incident-response workflows?
Operations What is the alert volume, tuning burden, latency, cost, and staffing requirement for human review?

Current official guidance does not establish a product benchmark or a universally proven detector. Treat claims about autonomous safety, anomaly accuracy, or complete coverage as deployment-specific until independently validated.

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Common implementation mistakes

Logging only prompts and responses

Why it fails: The dangerous event may be a tool call or accepted state change that is absent from the chat transcript.

Fix: Correlate model output, tool request, authorization result, downstream record, approval, and final outcome with one workflow identifier.

Giving broad access and planning to detect misuse

Why it fails: A missed alert can become an irreversible incident.

Fix: Narrow permissions, enforce downstream authorization, use read-only defaults, and add rate and retry limits before deployment.

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Treating model explanations as proof

Why it fails: A plausible rationale does not establish what the system actually did or whether it was allowed.

Fix: Compare stated intent with observed calls and independent system records.

Collecting every raw value forever

Why it fails: Monitoring data can expose credentials and personal information, creating a second breach target.

Fix: Minimize fields, redact by default, restrict access, and retain raw values only for a documented oversight or security need.

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Deploying an alert without an owner

Why it fails: Detection without a response path leaves harmful actions running.

Fix: Assign an accountable owner, escalation time, pause authority, and a tested recovery procedure for every high-impact alert.

Assuming a baseline remains valid

Why it fails: New tools, prompts, permissions, data, or model versions change normal behavior.

Fix: Re-baseline and retest after meaningful changes, and review whether the original approval thresholds still match impact and reversibility.

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What current guidance does and does not establish

NIST AI 800-4, published in 2026 after practitioner workshops and a literature review, describes monitoring as a broad set of technical, security, human-factor, compliance, and impact functions. It also documents open questions: methods, validated methodologies, and common terminology remain nascent and scattered. The Canadian and Australian government guidance adds practical expectations for approval, logging, system-wide coverage, reversibility, and gradual deployment. OWASP contributes concrete security controls such as downstream authorization, bounded execution, and protection against sensitive-data logging.

Together, these sources support risk-based monitoring rather than a single dashboard, score, or detector. Choose signals and thresholds according to what the agent can change, how quickly harm could spread, whether changes can be undone, which privacy and regulatory duties apply, and who is available to intervene.

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