Agent Identity

What Is Agent Identity?

AI agent identity answers two deceptively simple questions: “Which agent did this, and was it authorized?”

Every autonomous agent that calls APIs, queries databases or coordinates with other agents needs a credential that is unambiguously its own.

Three properties define a well-formed agent identity:

• Uniqueness: Each agent instance holds a distinct identifier, not a shared API key.
• Attestation: The identity is cryptographically verifiable so any downstream service can confirm the agent is what it claims.
• Scope: The identity carries only the permissions required for the current task, not the full rights of the user who deployed the agent.

Agent identities can also add a layer of accountability by including an owner or sponsor for every agent, identifying the human or group ultimately accountable for the agent and its actions.

Traditional identity and access management (IAM) systems were built for humans and long-lived applications but fall short when applied to agent identity. AI agents can:

• Spawn sub-agents
• Make autonomous decisions
• Operate across systems
• Act without human supervision

This is why they need dedicated identities that limit their actions and lifetime.

Only 18% of IT and security professionals are highly confident their current IAM can handle AI agent identities. Meanwhile, 45% of organizations apply the same level of access to AI agents as the humans behind them, resulting in overprivileged agents and security risks.

Agent Identity vs. Service Accounts and Human Identities

The easiest way to understand AI agent identity is to see where it sits relative to identity types you already manage.

The table below breaks down how agent identity compares to service accounts and human identities across lifespan, credentials, scope and risk.

When an AI agent borrows a service account, every action it takes is attributed to that account. Audit logs become ambiguous, and the account’s broad permissions become the agent’s permissions regardless of task requirements.

How AI Agent Identity Works

Agent identity is issued and verified through credential technologies and identity protocols. The lifecycle includes four steps:

1. Issuance: An identity provider issues the agent a short-lived credential at deployment. Common formats include SPIFFE Verifiable Identity Documents (SVIDs) (X.509 certificates or JWTs bound to a SPIFFE ID) and OIDC federation tokens.
2. Authentication: The agent presents its credential to each downstream service; the service validates it cryptographically, with no password exchange.
3. Authorization: Access is granted based on the agent’s assigned role and the scope encoded in its credential.
4. Revocation: Short-lived credentials expire automatically; a compromised token becomes worthless in minutes rather than persisting indefinitely like a static API key.

The NIST NCCoE concept paper “Accelerating the Adoption of Software and AI Agent Identity and Authorization”, published February 5, 2026, proposes six priority standards for agent identity:

1. OAuth 2.0/2.1
2. OpenID Connect
3. SPIFFE/SPIRE
4. SCIM (System for Cross-domain Identity Management)
5. NGAC (Next Generation Access Control)
6. Model Context Protocol.

Threats When Agent Identity Is Missing

When agents operate without their own identities, several attack paths open up:

1. Privilege inheritance: An agent running on a shared service account inherits its full permissions. The OWASP Top 10 for Agentic Applications 2026 ranks Identity and Privilege Abuse (ASI03) as a top-three risk, covering scenarios where agents reuse secrets, inherit high-privilege credentials or exploit implicit cross-agent trust.
2. Agent hijacking: Without a verified identity, indirect prompt injection or a malicious payload can redirect the agent to act on an attacker’s behalf while audit checks show only a legitimate service account.
3. Orphaned identities: Agents created and destroyed many times per day that share service accounts leave no clean lifecycle record, making it impossible to know which credentials are still active. These can become persistent entry points no one is monitoring or aware of.
4. Spoofing: Without a cryptographically bound agent identity, attackers can appear as a legitimate agent. Exposed credentials compromise every other agent that shares credentials with or communicates with the agent.
5. Inability to revoke access quickly: Revoking access requires changing the shared human password or finding every token stored throughout the system. Removing access can take hours while the agent continues operating.

Give every agent its own identity, one that can be checked, and one that only opens what the task requires. That goes a long way toward closing the gaps above.

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Frequently Asked Questions