A credential used by an AI agent to authenticate to tools, data sources, or downstream services. In practice, it should be scoped to a single task or session and never carry more authority than the agent actually needs to complete the approved action.
Expanded Definition
An agent credential is the authentication material an AI agent uses to reach tools, data sources, or downstream services. In NHI security, the term usually covers short-lived tokens, scoped API keys, certificates, or delegated OAuth-style grants that are bound to a specific task, environment, or session.
What distinguishes an agent credential from a generic secret is the operating model: the credential should reflect the agent’s actual execution boundary, not a broad human-style entitlement set. That is why NHIMG treats the term as inseparable from privilege scoping, lifecycle control, and revocation discipline. The OWASP Top 10 for Agentic Applications 2026 and the NIST AI Risk Management Framework both point toward the same operational principle: agent access must be bounded, monitored, and explainable.
Definitions vary across vendors when they blur agent credentials with service accounts, delegated user tokens, or workflow secrets. The most common misapplication is issuing a persistent credential to an autonomous agent because the integration is faster to ship, which occurs when engineering treats the agent like a durable backend system instead of a short-lived actor.
Examples and Use Cases
Implementing agent credentials rigorously often introduces orchestration overhead, requiring organisations to weigh faster integration against tighter session control and more frequent token rotation.
- An AI coding agent receives a time-boxed credential that can only read a repository and open a pull request, but cannot merge or release code.
- A customer support agent uses a delegated token to query a ticketing system for one case, then the credential expires immediately after the interaction ends.
- A data analysis agent accesses a warehouse through a narrowly scoped identity that can read approved tables but cannot export raw datasets.
- A deployment agent retrieves a certificate from a workload identity system for a single pipeline run, then rotates it before the next execution.
- Security teams review patterns from the Guide to the Secret Sprawl Challenge and compare them with the identity guidance in OWASP Non-Human Identity Top 10 to decide whether an agent credential is truly ephemeral or just renamed storage for a long-lived secret.
These use cases show why an agent credential is not simply “a key for an AI.” It is an operational control that should be auditable, revocable, and tied to a documented task boundary.
Why It Matters in NHI Security
Agent credentials become high-value targets because they are often embedded in automation paths, copied into prompts, or left active long after the task is complete. NHIMG research shows that 23.7% of organisations still share secrets through insecure methods such as email or messaging applications, which is exactly how agent access can escape governance and become reusable by attackers.
The risk is not theoretical. In the LLMjacking research, exposed AWS credentials were attempted by attackers within an average of 17 minutes, showing how quickly compromised NHI material is operationalised. That urgency is why CSA MAESTRO agentic AI threat modeling framework and the NIST SP 800-63 Digital Identity Guidelines are relevant even in machine-to-machine contexts: assurance, lifecycle, and recovery all matter.
When agent credentials are overprivileged, incident responders cannot tell whether a given action came from the intended agent or from an attacker using the same identity. Organisaties typically encounter the full impact only after a credential leak, at which point agent credential governance becomes operationally unavoidable to address.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
OWASP Non-Human Identity Top 10 and OWASP Agentic AI Top 10 address the attack and risk surface, while NIST SP 800-63 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-02 | Covers insecure secret handling and overexposed non-human credentials. |
| OWASP Agentic AI Top 10 | Addresses agent tool access, delegation, and misuse of autonomous execution authority. | |
| NIST SP 800-63 | AAL2 | Identity assurance concepts inform the strength and lifecycle of machine credentials. |
Apply equivalent assurance and revocation rigor to agent credentials used for service access.
