A model does not possess an independent legal or security identity simply because it has an agent name. Amazon Bedrock AgentCore Identity provides credential and workload-identity infrastructure for agent applications. The key architectural task is deciding whether a tool call is an application action or an action performed on behalf of an authenticated person, and ensuring the appropriate scopes reach the destination without leaking secrets to the model.
How the architecture works
AWS describes workload identities and credential providers that agents can use when calling resources and third-party tools. AgentCore Runtime can authenticate inbound calls using IAM or OAuth patterns; outbound access can use user-delegated or autonomous credential modes according to configuration. Distinguish these layers: caller authentication, agent workload identity, downstream credential, authorization at the target and operator approval for a consequential change.
A controlled, practical example
Suppose a support agent retrieves a shipping status and proposes an address correction. Reading the status may use a narrowly scoped service identity with tenant-aware filters. A change request must be authorized against the specific order owner. Request a confirmation containing the before/after address, maintain an expiry and idempotency token, and let the shipping backend apply it. The agent should receive only the status, not the secret used to perform the write.
Permissions, approvals and trust boundaries
Separate credentials for lookup, customer data and mutation; avoid a shared omnipotent token. Apply destination-side ACL checks even when AgentCore has validated the inbound user token. Rotate and revoke outbound credentials and record attribution in traces. Treat a service identity with access to all tenants as dangerous even if the model was told to remain within one user’s scope. Untrusted prompt or retrieval content must not be able to select an alternate credential provider.
Limits and version caveats
Identity services solve credential distribution, not semantic permission decisions. A valid credential does not prove the customer authorized a new delivery address, and delegated access can be too broad if upstream scopes are wrong. AWS documentation changes across managed runtimes and individual integrations; no claim is made that every external provider supports the same delegated mode. Pricing and regional eligibility are omitted pending exact dated snapshots.
Where it fits and what to use instead
Choose AgentCore Identity if AWS-based agent deployments need centrally managed credentials across runtime and gateway targets. Use standard IAM roles for simpler pure-AWS workload calls where appropriate, and ordinary OAuth delegated flows for existing web apps. A custom security broker can be justified by unusual data residency or cross-cloud needs, but entails additional audit and revocation engineering.
How to validate before deployment
Exercise incorrect audience, expired JWT, revoked consent, cross-tenant object ID and unsupported credential-provider cases. Observe denied writes and verify no automatic retry with higher privilege. Confirm sensitive token fields are excluded from all prompt traces and analytics. Review what remains authorized when an approver loses their role between approval and execution.
Version, tier and region applicability
The source links below describe specific capabilities or dated announcements; documentation may change afterward. Where no exact release version, eligible market, service region, contract plan or numeric quota is substantiated, those facts are unknown and are not inferred. This article is a researched implementation guide, not a record of hands-on testing, a license grant, a benchmark, or a current price quote. Independently recheck current product access and commercial terms before deployment.