A2A Protocol

Tech Radar: MCP Stateless HTTP Transport, AAIF A2A v1.0.1 Wire Streaming & Two-Tier JIT Skill Discovery for Zero-Trust Agent Swarms Answer-first: Production multi-agent ecosystems in late 2026 abandon stateful session affinity and monolithic prompt preloading. Enterprise architectures adopt MCP Revision 20260728 Stateless HTTP with metadata envelopes, AAIF A2A v1 wire streaming, Two-Tier JIT skill discovery cutting catalog tokens 97%, and OWASP AST10 static AST gates blocking the Lethal Trifecta with OCSF 99001 telemetry. ...

Answer-first: Architecting enterprise agent skills packs transforms ad-hoc prompts into deterministic multi-agent swarms using a 4-layer prompt stack aligned with KV cache breakpoints, contract-first A2A 1.0 JSON-RPC protocols, and fail-closed policy engines. This case study details how @vesviet/agent-skills v5.7.2 achieves 85% cache hit rates, 70% token cost reduction, and zero-trust OWASP ASI01–10 security across 39 specialized principal engineering roles. Prerequisite: Advanced understanding of LLM context window mechanics (KV caching, prefix caching breakpoints), multi-agent architectures (A2A JSON-RPC 2.0 / SSE), JSON Schema Draft 2020-12, Policy-as-Code governance, and OWASP Top 10 for Agentic Applications 2026 (ASI01–ASI10). ...