How should organisations govern east-west agent traffic?

Governing east-west agent traffic as delegated authority

East-west agent traffic should be governed as delegated authority in motion, not as ordinary internal chatter. The key question is not whether the traffic stays inside the perimeter, but whether each agent is allowed to act on behalf of something else, with a bounded purpose, a clear trust path, and an auditable decision trail.

That shift matters because internal calls often inherit trust from the environment rather than from the request itself. Once an agent can invoke another agent, service, or tool, the real control problem becomes delegation scope: who can call whom, with what claims, for which actions, and for how long that authority remains valid.

Effective governance therefore starts with an inventory of agent relationships, not just an inventory of services. Organisations need to know which agents exist, which identities they use, which internal APIs they touch, and which calls are direct, proxied, or chained through other agents or service accounts. Where workload identity is the control path, SPIFFE and SPIRE provide a useful model for treating service-to-service trust as something explicit, attested, and revocable rather than assumed.

Governance also needs to define the delegation policy, not merely the transport policy. If an agent can obtain data, submit work, trigger tools, or fan out requests to other agents, those actions should be evaluated as privilege-bearing operations. In practice that means scoping access to the minimum action set, using short-lived credentials where possible, and making any downstream delegation a separate decision instead of an automatic inheritance of upstream trust. For agentic systems, AI Agent Authorisation Guide is a natural companion for the least-privilege side of that decision.

Monitoring is the other half of governance. East-west traffic is only governable when internal APIs, token use, and service-account-backed calls are observable enough to reconstruct who initiated a request, which agent forwarded it, and whether the resulting action was expected. If the organisation cannot distinguish a normal delegation chain from an anomalous one, internal trust is being treated as a fact rather than as a control. For operational visibility, AI Agent Observability, Audit and Incident Response Guide is the clearest fit for logging, attribution, and response design.

What internal agent trust should look like in practice

Well-governed east-west traffic has three visible properties: bounded delegation, explicit verification, and revocation that actually works. Bounded delegation means an agent receives only the authority needed for the current task. Explicit verification means the target side checks the caller’s identity, not just the network location. Revocation means an expired or withdrawn grant cannot keep working through cached tokens, stale allowlists, or unreviewed service-account permissions.

This is where agent-to-agent design can go wrong. Multi-hop systems tend to accumulate implicit trust, especially when one agent is allowed to delegate to another without a fresh policy decision. That creates a broad blast radius if the first agent is compromised, misconfigured, or simply over-tasked. Multi-Agent and A2A Security Guide is especially relevant for understanding how delegation chains, signed assertions, and containment should work across agent boundaries.

The best governance pattern is to treat each east-west hop as a separate authorization event. If the requester, the delegator, and the action performer are not all the same entity, the control plane should record that distinction and enforce policy on the hop that changes responsibility. That is how organisations prevent “internal” traffic from becoming a hidden privilege-escalation path.

Where agents interact through APIs, policy should focus on action-level checks, not just authentication at session start. API requests that move data, trigger workflows, or change state need authorization that is specific to the object, function, and context of the request. For deeper alignment with request-level controls, the external guidance from OWASP Agentic AI Top 10 is useful because it frames identity and privilege abuse as a first-class risk in agentic systems.

How to operationalise governance without slowing the system down

The practical challenge is to govern east-west traffic without turning every internal call into a manual approval workflow. The answer is not blanket blocking, but policy that is machine-enforced, narrowly scoped, and instrumented for exception handling. High-trust paths should be rare, time-bound, and easy to identify in telemetry; common paths should be pre-authorized, but only within a clearly defined trust boundary.

Organisations should prioritise the paths that can create the most downstream impact first: agents that can reach production data, trigger financial or customer-facing actions, or call other agents with broad privileges. Those are the paths where a single weak delegation decision can cascade into many others. For that reason, a useful governance program pairs inventory with policy review, then overlays monitoring and periodic revalidation of who is allowed to delegate. If a path cannot be explained in one sentence, it is usually too permissive.

Practitioner takeaway: The governing principle is to make delegation visible, bounded, and revocable at every hop. If an internal agent call changes trust, access, or authority, it deserves the same discipline as an external authentication flow, because that is where the real control boundary now sits.

Related resources from NHI Mgmt Group

• How can organisations reduce the blast radius of compromised agent identities?
• What breaks when organisations rely on detection instead of prevention for east west traffic control?
• What breaks when organisations do not have east west traffic visibility during a breach?
• What breaks when organisations do not segment east-west traffic?