A2A vs MCP in production: why most teams still use MCP for agent communication
Human-Agent6509 · reddit · 2026-09-13
A discussion on real-world adoption of the A2A protocol versus MCP.
- Conceptually clear: MCP standardizes how an AI app accesses tools/resources; A2A standardizes discovery, messaging, task delegation and artifact return between independent agents
- In production the gap is huge: MCP solves an immediate need (connecting databases, files, APIs), while A2A only matters for true inter-agent interoperability, dragging in identity, discovery, auth, task ownership, delivery guarantees and trust
- The author observes most multi-agent apps still use an orchestrator calling workers directly — no real agent-to-agent addressing required
- Open question: is anyone actually running A2A in production, and what requirement made it necessary rather than nice-to-have?
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