Agent 365 Incident Response Tabletop for Security Leads

AI agents can turn a routine workflow into a material security event within minutes. If an agent can read sensitive files, query a business system, or trigger an automated response, your team needs to know who can stop it and what evidence survives.

This Agent 365 tabletop exposes those answers before a rushed analyst has to find them during an actual incident. I use these exercises to test decision rights, evidence quality, identity controls, and runtime protection. They also clarify the boundary between safe automation and human approval, turning decisions into practical response plans.

A useful session treats the agent as both a new workforce identity and a new attack surface.

Key Takeaways

• Run an Agent 365 incident response tabletop before deployment with a production-like agent, meaningful permissions, redacted data, and test accounts.
• Treat each agent as both a workforce identity and an attack surface, separating design-time posture failures from runtime threats.
• Assign named owners and decision rights across Entra, Defender XDR, Purview, business teams, and incident platforms before an incident tests them.
• Protect prompt and tool-call evidence through access controls, minimization, retention rules, redaction, and documented chain-of-custody procedures.
• Leave the exercise with a prioritized remediation roadmap that names accountable owners, deadlines, validation evidence, escalation paths, and recovery authority.

Run an Agent 365 incident response tabletop before deployment

Microsoft Agent 365 helps organizations discover, govern, and secure AI agents across Microsoft and third-party environments. Microsoft’s agent governance and security guidance separates the layers that govern identities, data, applications, and operational security.

A tabletop should test more than whether an agent can answer a security question. It should include a posture assessment and test runtime protection. It must show whether the organization can contain an agent after malicious instructions, prohibited data access, or an unauthorized workflow trigger.

Start with an agent inventory, then select a production-like agent with meaningful permissions. Use redacted data and test accounts where possible. Bring the people who own identity, security operations, data governance, business processes, legal risk, and executive communications into the same room.

The control plane is where you establish inventory, ownership, identity, policy, and lifecycle oversight. The official Agent 365 product information also outlines the service’s role in managing, protecting, and governing agents. Microsoft Defender XDR is where security teams investigate runtime signals and coordinate response. Those jobs overlap during an incident, but the governance and runtime layers are not interchangeable.

The service became generally available in May 2026, but verify that statement against current official Microsoft sources. Confirm connector support and response actions in your tenant before converting tabletop findings into response plans and deployment runbooks. In your tenant, check whether Microsoft Sentinel, Security Copilot, Copilot Studio, Advanced Hunting, and Azure Monitor are available. Then verify PagerDuty and ServiceNow workflows, treating Defender Experts as an optional escalation or advisory resource. This matters for organizations with GCC High, CMMC obligations, or specialized data-residency requirements.

For budgeting, Microsoft 365 E7 is priced at $99/user/month, but verify current E7 pricing and consumption charges against official Microsoft sources. $99/user/month covers licensing only; Azure compute, model, and message consumption bill separately.

Assign ownership across the control plane and SOC

An incident stalls when everyone assumes another team owns the next action. I begin every incident response exercise by mapping authority, not merely administrative roles.

Team or platform	Decision tested during the tabletop
Microsoft Entra administrators	Can they disable AI agents, revoke sessions, remove access packages, and confirm sponsor ownership?
Microsoft Defender XDR analysts	Can they correlate alerts with Microsoft Sentinel, use Security Copilot for analyst assistance, review Azure Monitor telemetry, preserve evidence, scope impact, and initiate approved containment?
Microsoft Purview administrators	Can they identify affected sensitive data, apply policy, and retain evidence under the correct schedule?
Microsoft 365 administrators	Can they restrict the agent environment, connected apps, and Copilot Studio configuration?
Business owners and incident leadership	Can they approve service interruption, customer notification, recovery, and reactivation? Can they confirm the handoff across incident platforms, from PagerDuty’s on-call escalation to ServiceNow’s case ownership?

Response plans should assign named owners for containment, with Defender Experts as an escalation option when internal coverage is insufficient.

Microsoft Entra controls should enforce least privilege at the agent identity level. That includes sponsor assignment, access packages, privileged application permissions, and a process for removing dormant or abandoned agents.

The XDR team needs the operational view. The security operations center owns runtime investigation, and runtime protection depends on usable telemetry and clear authority. During the exercise, analysts should demonstrate how observability data supports an investigation. Where available in your tenant, Advanced Hunting data such as AgentsInfo and BehaviorInfo can help tie an agent’s behavior to identity, tools, sessions, and alerts.

Purview owns the data boundary. Security leads should ask whether the agent received content with sensitivity labels, whether a DLP policy should have blocked an action, and whether prompt or tool-call evidence contains regulated information. Security leads should require those response plans to document approval and reversal authority. Microsoft’s Agent 365 security guidance describes how governance requirements can include Entra policy templates and access packages.

Do not measure success by how quickly an agent acts. Measure it by whether the right owner can explain, approve, or reverse that action.

Separate posture failures from runtime threats

For an Agent 365 incident response tabletop, a design-time posture assessment examines AI agents for unsafe conditions before an incident occurs. Examples include excessive permissions, an unknown agent owner, an unapproved connector, weak authentication, missing logging, or an agent that can access a broad SharePoint site without business justification. Repeat the posture assessment after permission or connector changes.

Runtime protection addresses behavior while the agent operates. Microsoft Defender XDR can support threat detection for suspicious tool use, unusual access, prompt injection attempts, jailbreak behavior, and potential secret exposure. Security Copilot, Advanced Hunting, AgentsInfo, and Azure Monitor help analysts correlate identity with observability data. Runtime protection also requires tracing prompt handling and tool calls. The investigation must answer what the agent received, what it interpreted, which tools it invoked, and what changed as a result. An attempted prompt injection differs from a successful action.

That distinction improves response decisions. A posture gap may call for a configuration change and a control owner, with response plans updated afterward. Runtime protection findings may require immediate containment, credential rotation, legal review, and business communication. PagerDuty and ServiceNow can route these escalations. Business email compromise and credential compromise are familiar identity-driven scenarios that can overlap with agent misuse. When internal capacity is limited, Defender Experts can provide investigation support.

For a mid-market company, this review should map dependencies across cloud infrastructure and endpoint security. Include legacy data-center technology when integrations remain. POS systems also belong in scope when agents can access ordering, inventory, payment, or helpdesk systems.

Use scenario injects that force real decisions

A strong Agent 365 exercise introduces information in stages. Each inject should force a real incident response decision involving AI agents, an owner, a control, and a documented time limit.

Begin with a runtime protection alert showing an agent processing a prompt injection embedded in a supplier document or support ticket. Where available, the security operations center can use Microsoft Sentinel and Security Copilot for initial triage.

Then introduce new facts: the agent attempted to access a restricted document library. A connected Copilot Studio workflow prepared an external message, creating a possible business email compromise scenario. A privileged service account then received an unexpected request.

That update should test runtime protection again and force a containment decision.

Response plans should define approval thresholds before the exercise begins. New facts should force response plans to change with the evidence and business impact. Use the playbooks to establish clear authority at each point:

1. Allow low-risk automated actions, such as opening a case, collecting approved telemetry, and adding indicators to the investigation.
2. Require analyst approval before disabling an agent identity or suspending a business workflow.
3. Require business-owner approval before interrupting customer-facing operations or revoking a shared integration.
4. Require executive or legal approval when the event may involve regulated data, contract obligations, or external disclosure.

Your incident platforms must carry useful context, not just alert titles. Every handoff should include the agent ID, owning business process, affected data source, last tool call, and escalation contact.

Stage	Handoff
Initial alert	Azure Monitor sends observability data to PagerDuty for initial alert routing, and ServiceNow creates the case.
Analyst escalation	PagerDuty escalates to the analyst, who uses Advanced Hunting to correlate agent ID, identity, tool, and session evidence. Defender Experts can support complex cases.
Recovery validation	Azure Monitor validates the recovery signal, ServiceNow records the recovery or change ticket, and PagerDuty confirms recovery. AgentsInfo adds ownership and configuration context.

I also test recovery decision rights. The person who can disable an agent identity is not always the person who can restore it. Recovery response plans should name a documented owner, require a post-incident permission review, and confirm that the original attack path is closed.

Protect prompt evidence without losing the investigation

Prompt and tool-call evidence from AI agents can be sensitive during incident response. It may contain customer records, export-controlled material, credentials, source code, internal strategy, or signs of credential compromise. Logging everything without access controls can create a second incident, so runtime protection starts with evidence minimization.

Set evidence-access rules before deployment, informed by a posture assessment. Define which records the SOC can access, when privileged reviewers must approve unredacted content, where evidence remains, and how long it is retained. Document response plans and playbooks for privileged review, redaction, retention, disclosure, and chain of custody. For defense contractors, align these controls with contract obligations, CMMC practices, and systems that hold controlled unclassified information.

Test data-access and sharing paths with a concise evidence-flow example. Copilot Studio, where enabled, records the request; Advanced Hunting, where available, adds investigation context; and AgentsInfo, where available, records agent activity. Microsoft Sentinel, where enabled, correlates events; Security Copilot, where available, supports review; and Azure Monitor, where available, preserves telemetry. ServiceNow, where enabled, completes the handoff to incident platforms, while PagerDuty, where available, triggers evidence preservation. That observability data supports runtime protection by tracing what the agent read, changed, and shared, creating a defensible investigation trail.

Many firms describe new projects with broad labels, but specific identity, logging, retention, recovery, and communications controls matter more. I look for clear ownership and disclosure rules that make security work defensible and support business continuity. Escalation should follow the documented path, including PagerDuty, where available, when investigators need prompt access.

Leave with a remediation roadmap, not a meeting summary

A well-run tabletop produces decisions your team can assign and track. I deliver an incident response inject record for the affected Agent 365 deployment. It shows what information appeared, who acted, and where timing or authority broke down.

The core deliverables should include:

• An observed decision-and-control gap register for each affected agent. It names the accountable owner, risk, corrective action, deadline, and validation evidence.
• A prioritized remediation roadmap with separate response plans for immediate runtime protection fixes, longer-term policy changes, and control plane ownership changes.
• An executive readout that explains business exposure, service dependencies, recovery authority, and investment priorities.
• Runbook recommendations for Defender XDR, Microsoft Sentinel, Copilot Studio, Advanced Hunting, and Defender Experts. They include playbooks for Entra, Purview, and business escalation teams, based on the tenant’s enabled capabilities.

The roadmap also includes a compact integration-owner matrix:

Workstream	Integration path	Accountable owner	Required output
Telemetry and triage	Azure Monitor, PagerDuty, and ServiceNow	SOC or incident lead	Alert routing, case creation, and severity evidence
Recovery and change control	ServiceNow, PagerDuty, and Azure Monitor	Service owner and change authority	Approved change, restoration evidence, and closure

Each response plan receives an owner, due date, validation step, and escalation path.

The result is a measurable operating record, not a generic consulting summary. It documents the affected agent, accountable owner, risk, corrective action, deadline, validation evidence, and recovery authority. Those outputs support infrastructure optimization, device hardening, and durable operational ownership.

When this engagement isn’t worth it

An Agent 365 tabletop is premature when no relevant AI agents are planned, no agent can access meaningful data or take meaningful actions, or operational ownership remains unassigned. In those cases, start with an agent inventory, an identity model, and basic governance decisions.

It also has limited value if executives won’t name people who can approve containment, service interruption, and recovery. Leaders must also approve and resource the resulting response plans. A scenario cannot fix missing authority during a two-hour meeting.

Frequently Asked Questions

What is an Agent 365 incident response tabletop?

An Agent 365 tabletop is a structured exercise that tests how an organization would detect, contain, investigate, and recover from an incident involving an AI agent. It focuses on decision rights, identity controls, runtime protection, evidence quality, and recovery authority.

Who should participate in the exercise?

The session should include identity administrators, security operations, data governance, Microsoft 365 and business-process owners, incident leadership, and legal or communications representatives as needed. Each participant should have a defined authority for containment, service interruption, evidence access, notification, or recovery.

What scenarios should the tabletop test?

Use scenarios such as prompt injection, prohibited data access, suspicious tool use, an unauthorized workflow trigger, or a connected workflow preparing an external message. Each inject should introduce new evidence and force a documented decision about containment, approval, escalation, or recovery.

How should prompt and tool-call evidence be handled?

Treat prompt and tool-call records as potentially sensitive evidence because they may contain customer data, credentials, source code, or regulated information. Define access, redaction, retention, disclosure, and chain-of-custody rules before deployment so the investigation does not create a second incident.

When is an Agent 365 tabletop premature?

The exercise has limited value when no relevant agents are planned, agents cannot access meaningful data or take meaningful actions, or operational ownership remains unassigned. Start with an agent inventory, an identity model, and basic governance decisions before scheduling the tabletop.

A controlled agent needs a controlled response

An agent that can take action needs the same discipline as any privileged system. The strongest Agent 365 incident response programs connect governance controls, investigation, evidence handling, and recovery authority before a security event tests them.

A tabletop gives security leads a safe way to find the gaps that matter. Clear decision rights turn governance assumptions into an accountable response.