Each delegation hop should get a narrower identity than the one above it. The downstream agent should receive only the tools, records, and purpose required for its subtask, because passing full authority through the chain turns delegation into privilege amplification rather than controlled execution.
How multi-agent permissions should be structured
Permissions in a multi-agent system should be layered by task and by hop, not copied from one agent to the next. The core design goal is to keep authority narrow at every delegation step so each agent can complete its subtask without inheriting broad access, broad memory, or broad operational side effects from its caller.
That means the orchestrator, planner, or parent agent should not act as a blanket proxy for every downstream worker. Instead, each subordinate agent should receive only the minimum tools, data, and action scope it needs for the specific work item, with any broader approval or escalation handled outside the delegation chain.
A useful way to think about this is that permissions should follow the shape of the work, not the shape of the organisation. If a sub-agent only needs to read records and draft a response, it should not also be able to approve, delete, reorder, or silently expand the request into adjacent systems. The more the chain mirrors least privilege, the less likely it is that one compromised or overconfident agent can amplify into a system-wide event.
What “narrower identity at each hop” means in practice
Each hop should translate authority, not inherit it wholesale. In practice, that often means issuing task-scoped credentials, constraining tool catalogs, bounding datasets to the minimum record set, and separating read, write, and execute actions so a downstream agent cannot accumulate implicit power just because it sits deeper in the workflow.
For multi-agent systems, delegation should also be explicit about purpose. An agent acting on behalf of another should know whether it is allowed to observe, recommend, retrieve, transform, or commit. AI Agent Authorisation Guide is useful here because it frames per-action authorization and task-scoped access as the practical basis for keeping delegated authority bounded.
That structure is especially important when agents can chain tools or call other agents. If the intermediate agent can expand scope on its own, delegation stops being a control and becomes a privilege multiplier. Good designs make each agent’s effective power smaller than the power of the coordinator above it, while still preserving enough access to finish the task cleanly.
Why overbroad delegation fails in multi-agent systems
Multi-agent systems create failure by composition: every extra hop adds another place where authority can be widened, reused, or misapplied. The risk is not only outright compromise. It is also accidental overreach, where an agent is technically “helpful” but ends up taking actions that were never intended for its role.
That is why Multi-Agent and A2A Security Guide is centered on multi-hop delegation, signed Agent Cards, and containment. Those controls matter because inter-agent trust has to be provable and bounded, especially when one agent can invoke another across organizational or system boundaries.
The architectural mistake to avoid is treating every downstream worker as if it were equally trusted with the original principal’s authority. Once that happens, compromise of one agent, one tool, or one prompt path can expose the permissions of the entire chain. The correct pattern is to shrink the blast radius at each interface, then re-authorize only what the next step truly needs.
Risk and Threat Considerations
Overbroad permissions in multi-agent systems create privilege amplification, lateral misuse, and cross-agent trust abuse. The failure is especially serious when one agent can inherit credentials, operate on shared context, or invoke tools that exceed its subtask, because a single bad delegation can turn a narrow workflow issue into broad unauthorized access or destructive action.
Failure mechanism: A parent or orchestrator agent passes forward excessive authority, or a downstream agent reuses inherited access to call tools, modify records, or escalate its own scope. In multi-hop systems, that often appears as weak delegation boundaries, shared tokens, or unbounded tool invocation across agents.
Impact: The system loses containment. One compromised, mis-specified, or overly capable agent can expose data, trigger unintended actions, or amplify a small error into an incident across the full agent chain.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
OWASP Agentic AI Top 10 and CSA MAESTRO address the attack and risk surface, while NIST SP 800-53 Rev 5 and NIST Zero Trust (SP 800-207) set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Agentic AI Top 10 | ASI03 — Identity & Privilege Abuse | Multi-agent delegation is fundamentally about preventing privilege escalation across agents. |
| Recommendation — Bound each agent hop to task-scoped privileges and separate approval for expanded access. | ||
| CSA MAESTRO | Multi-Agent Environment, Security, Threat, Risk and Outcome | The question concerns secure orchestration and containment across multiple agents. |
| Recommendation — Model delegation boundaries and containment rules before allowing agent-to-agent execution. | ||
| NIST SP 800-53 Rev 5 | AC-6 — Least Privilege | The answer hinges on limiting each agent to the minimum authority needed for its subtask. |
| IA-5 — Authenticator Management | Delegated agents often rely on credentials or tokens that must not be over-shared or long-lived. | |
| Recommendation — Assign each agent only the permissions required for its current task and nothing broader. Issue and rotate delegated credentials so downstream agents cannot reuse excess authority. | ||
| NIST Zero Trust (SP 800-207) | Zero Trust Architecture | Multi-agent trust should be continuously verified rather than inherited across hops. |
| Recommendation — Verify each request and principal independently before allowing cross-agent access. | ||
Practitioner Guidance
What to prioritize: Define the minimum permitted action set for each agent hop before you define the orchestration flow. If you cannot describe what a worker is forbidden to do, the permission model is probably too broad.
What to verify: Check that every delegated action is tied to a task scope, an explicit purpose, and a separate decision point for any write, execute, or cross-system operation. The important test is whether the downstream agent could still complete the subtask if its access were reduced further.
Common mistake: Treating “trusted internal agent” as a reason to reuse the upstream identity unchanged. In practice, trusted composition is what creates silent overprivilege, because each added tool and each added hop widens the effective attack surface.
Practitioner takeaway: The safest multi-agent design is one where delegation narrows authority at every step, and any expansion of power is deliberate, visible, and separately approved.