Problem

When Agent A delegating to Agent B uses unstructured natural language, Agent B is forced to parse intention dynamically, introducing hallucinations and non-deterministic outcomes into the delegation loop.

Approach

A2A protocols enforce strict JSON Schema contracts. Before Agent B accepts a delegation request, Agent A must serialize its parameters against the published schema. Agent B's Guardian evaluates the incoming payload; if it violates the schema, it yields an immediate DENY_MALFORMED.

Invariants

All A2A incoming requests must validate against a pre-registered JSON Schema.
Validation must occur before the reasoning layer is invoked.

Artifacts

Agent-to-Agent Zero Trust Standards

References

JSON Schema Specification