AI agents are becoming active participants in enterprise environments rather than passive software components. They can retrieve information, call APIs, interact with applications, and perform tasks with varying degrees of autonomy. As their numbers increase, organizations face a basic identity-security challenge: knowing which agents exist, what each agent is allowed to do, who is responsible for it, and how its activity connects to enterprise resources. The Agent Registry provides an important visibility and governance layer for answering these questions. In Microsoft’s current architecture, the registry is surfaced primarily through Microsoft Agent 365, while Microsoft Entra Agent ID provides the identity and access layer for agents that have Entra-backed identities.
Building a Reliable Inventory of AI Agents
Traditional identity programs are designed largely around employees, service accounts, applications, and other established workload identities. AI agents introduce another category that can be created, configured, published, shared, or connected to tools at a much faster pace. Without centralized visibility, security teams can struggle to determine which agents are legitimate and which have become unnecessary or risky.
The Agent Registry addresses this problem by providing a centralized inventory and governance view. It can help administrators identify agents across the tenant, examine ownership and platform information, and understand whether an agent is published, available, blocked, or otherwise restricted. The registry can also contain agents that do not possess a first-class Microsoft Entra Agent ID, meaning visibility is not necessarily limited to agents with Entra-backed identities.
This distinction is important because inventory and identity are related but different functions. An organization might discover an agent through the registry before determining whether it should receive a dedicated identity, what permissions it needs, or whether it should be permitted to operate at all. Consequently, the registry becomes a useful starting point for establishing accountability around AI agents.
Mapping Ownership, Capabilities, and Agent Identity
Knowing that an agent exists is only the first step. Security teams also need context about what the agent does and who is responsible for it. Agent metadata can provide information about ownership, capabilities, skills, tools, connected resources, and other configuration details. Microsoft’s agent model also uses an agent card to describe an agent for discovery and integration, including capabilities, supported interfaces, and authentication requirements.
This information makes it easier to understand the mechanics of agent identities within a broader enterprise identity architecture. An agent may have an identity associated with a particular blueprint, credentials configured for authentication, and permissions that determine which resources it can access. The registry does not replace those identity controls; instead, it provides organizational visibility around the agents that may depend on them.
For example, consider an agent responsible for retrieving internal sales information. Its registry record can help establish who owns it, where it was created, what tools it uses, and whether it is available to employees. Identity administrators can then examine the corresponding Entra identity and determine whether its permissions are appropriate. This separation between inventory and identity helps prevent a common governance mistake: assuming that knowing about an agent automatically means understanding its security posture.
Connecting Registry Visibility With Access Governance
The value of the Agent Registry becomes clearer when it is connected to permission management. An agent can be visible, legitimate, and properly owned while still having excessive access. Conversely, an agent might appear harmless but become a concern if its credentials or permissions allow it to reach sensitive resources.
Understanding how agent identities operate requires looking at authentication as well as authorization. Microsoft describes several OAuth-based authentication patterns for agent identities, including autonomous app-only access, On-Behalf-Of authentication, and an agent-user context. These flows determine how tokens are obtained and how user or application context participates in access decisions.
A practical governance process therefore connects registry information with identity controls. Organizations should maintain a clear relationship between an agent, its owner, its identity, its credentials, and its assigned permissions. They should also periodically review whether those permissions still match the agent's purpose.
Several registry and governance activities can contribute to this process:
- Inventory: Identify agents operating across the tenant, including agents that may not have Entra-backed identities.
- Ownership: Establish accountable owners who can explain an agent's purpose and approve changes.
- Capability review: Examine tools, data sources, skills, and connected services associated with the agent.
- Availability control: Determine whether users can discover, install, or use the agent.
- Lifecycle management: Block, unblock, remove, or reassign agents when business requirements change.
- Identity review: Where an Entra Agent ID exists, evaluate authentication methods, permissions, and access controls separately.
These activities help security teams move from simple discovery toward continuous identity governance.
Using the Registry to Detect Governance Gaps
The registry can also reveal inconsistencies that might otherwise remain hidden. An organization may find agents without clear owners, agents that are no longer needed, or agents whose capabilities do not align with their documented business purpose. These conditions do not automatically indicate malicious activity, but they represent governance weaknesses worth investigating.
The distinction between blocking an agent in the registry and disabling its Entra identity is particularly important. Registry-level controls can determine whether users can install or use an agent in supported Microsoft 365 experiences. Identity-level controls affect authentication and token issuance for an underlying Entra agent identity. These controls therefore address different parts of the agent lifecycle and should not be treated as interchangeable.
This layered approach also improves incident response. If an agent begins behaving unexpectedly, administrators need to determine whether the issue involves the agent's availability, its identity, its credentials, its permissions, or the resources it accesses. A centralized inventory provides the contextual information needed to investigate those questions more efficiently.
Making Agent Tracking Part of Identity Operations
AI agent governance should not be treated as a one-time registration exercise. Agents can change owners, gain new capabilities, connect to additional tools, or receive different permissions over their operational lifetime. Each change can alter the associated security risk.
Organizations should therefore incorporate agent tracking into established identity-management practices. Security and identity teams can periodically reconcile registry records with Entra identities, validate ownership, review permissions, and remove obsolete agents. Monitoring should also consider authentication activity and token usage, particularly for agents that operate autonomously or access sensitive enterprise resources.
The registry is most effective when treated as part of a broader control system rather than as a standalone directory. Agent 365 provides the discovery and governance perspective, while Entra Agent ID handles identity, permissions, and related security controls for agents with Entra-backed identities.
Final Analysis
As AI agents become more deeply integrated into enterprise workflows, identity teams need visibility that extends beyond traditional users and applications. The Agent Registry provides that visibility by creating a centralized view of agents, their ownership, capabilities, availability, and associated governance information.
Its greatest value comes from connecting that inventory with identity and access controls. When organizations know which agents exist, understand who is accountable for them, and can relate those agents to authentication and authorization mechanisms, they can make more informed security decisions. The result is a more structured approach to managing autonomous software without treating every agent as an unmanaged application or assuming that registry visibility alone provides security.