◎ Platform · Protocol Security · A2A Security

Identity that travels through the delegation chain.

Agent-to-Agent communication is how modern agentic systems scale. That delegation is also where identity can dissolve, scope can expand without authorization, and accountability can disappear entirely. Trust3 AI makes every A2A handoff a secured act: identity verified, scope bounded, sensitive data protected in transit, and every hop captured in a single traceable record.

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THE CHALLENGE

Delegation without verification is a new attack surface.

When one agent hands work to another, three questions matter and the current state of A2A protocols answers none of them reliably. Who is the receiving agent? What is it actually allowed to do? And if something goes wrong, where in the chain did it happen?

Without explicit identity verification and scope bounding, a receiving agent inherits everything the delegating agent had. That's not delegation. That's escalation. And without end-to-end traceability, a three-hop chain that produces a violation becomes a forensics problem rather than a matter of looking at a record.

HOW IT WORKS

Five controls. End-to-end identity across every hop.

01
Agent Identity Verification

Every agent in the chain carries a verified identity.

Before any A2A delegation proceeds, Trust3 AI verifies the identity of both the delegating and the receiving agent. An unregistered agent, a shadow agent running under an org API key, or an agent whose identity doesn't match its registered profile cannot receive delegated work. Impersonation is blocked at the protocol layer before the handoff happens.

  • Both delegating and receiving agent identities verified before any work is transferred
  • Unregistered or shadow agents cannot receive delegated work
  • Identity mismatch (credentials that don't match the registered profile) blocked at the protocol layer
  • Every identity verification logged with timestamp, both agent identities, and outcome
02
Scope Inheritance & Bounding

Receiving agents inherit scope. They cannot exceed it.

When an orchestrator delegates to a sub-agent, the sub-agent inherits the orchestrator's declared purpose scope and Trust3 AI applies any additional restrictions appropriate to the receiving agent's role. At each hop in a multi-hop chain, scope can narrow. It cannot widen. A worker agent at the end of a three-hop chain operates within the intersection of every scope applied above it.

  • Receiving agent inherits delegating agent's declared purpose scope as the ceiling
  • Trust3 AI applies additional restrictions at each hop based on the receiving agent's role and Trust Score
  • Scope can narrow through the delegation chain, never widen
  • Attempts to access resources outside the inherited scope blocked and logged
03
Automatic PII, PCI, and PHI Redaction

Sensitive data doesn't travel beyond the agents that need it.

Trust3 AI scans every outbound A2A message before delivery. PII, PCI, and PHI detected in the message content is redacted before it reaches the receiving agent. If the receiving agent's approved scope doesn't justify the content at all, the message is blocked and the delegating agent is notified.

  • Outbound A2A messages scanned for PII, PCI, and PHI before delivery
  • Detected sensitive content redacted based on the receiving agent's approved scope
  • Messages blocked entirely if the receiving agent's scope doesn't justify the content
  • Every redaction and block event logged with what was detected, what action was taken, and which agents were involved
04
Delegation Chain Traceability

Every hop in the chain. One record.

Multi-hop agent workflows produce a lineage record in Trust3 AI covering every delegation, every tool call made within the delegated task, and every policy decision reached along the way. When something goes wrong, the record shows exactly where in the chain it happened and what scope the agent was operating under at that moment.

  • Full delegation chain recorded: orchestrator to coordinator to worker, every hop
  • Tool calls within each delegated task captured as part of the chain trace
  • Policy evaluation results (which policy fired, what decision was reached) recorded at each hop
  • A2A handoffs, MCP tool calls, and direct LLM interactions in a single correlated trace
  • One click from any issue to the full chain of evidence
  • Retained permanently as your compliance record
05
Reputation-Aware Routing

Trust Score is an active input to every delegation decision.

Before a delegation proceeds, Trust3 AI evaluates the Trust Scores of both agents involved. Low-trust agents face additional restrictions as delegation targets. Critically low scores can block a delegation entirely, requiring human review before the task continues. A Trust Score drop mid-task can pause the workflow and route to human review before any further actions are taken.

  • Trust Score evaluated for both delegating and receiving agent before any handoff
  • Agents below configured thresholds face additional scope restrictions as delegation targets
  • Critically low scores block delegation: workflow pauses, human review required
  • Trust Score drops mid-task trigger intervention: pause, restrict, or escalate to human-in-the-loop
  • Routing decisions logged with the scores at time of decision

Delegation is how agentic systems scale. Trust3 AI makes sure identity scales with it.

Every A2A handoff is a moment where identity can dissolve, scope can expand, and accountability can disappear. Trust3 AI makes it a verified, bounded, and fully traceable act instead.