An AI assistant that can write a proposal is useful. An assistant that can request stock information from a supplier’s agent, retrieve approved product details, and return a traceable proposal could be more useful still. The difficult part is not another clever prompt: it is getting separate systems to cooperate without handing each other unrestricted access.
In 2026, open agent interfaces are becoming a concrete purchasing consideration. That does not mean every product interoperates, or that connecting agents makes them reliable. It means buyers can ask more precise questions than “Does this have integrations?”
Two protocols, different jobs
The A2A v1.0 announcement, dated March 12, describes a stable standard for communication between agents. It includes version negotiation, multiple protocol bindings, and signed Agent Cards that can help verify advertised agent identity and metadata. Clients can consume task updates through polling, streaming, or webhooks.
The same announcement explicitly separates A2A from the Model Context Protocol. MCP typically connects an individual agent to tools and context. A2A addresses communication and coordination between agents. A product may use both, but supporting one does not establish support for the other.
Think of a local accounting assistant. Reading invoice records through a connector is a tool-access problem. Delegating a question to a supplier’s separately operated agent is an agent-communication problem. Both still require authorization and business rules.
Why this is more than an integration badge
NIST’s February 17 initiative identifies interoperability, security, and agent identity as areas needing standards and research. This is a statement of work to pursue, not a certification that any particular agent is safe.
More recently, the Linux Foundation’s October 22 announcement added Open Responses to the Agentic AI Foundation’s projects. That specification addresses yet another boundary: a shared interface for applications communicating with models from different providers. Tool access, agent delegation, and model APIs are related, but they are not interchangeable layers.
For a small builder, these distinctions can reduce avoidable custom plumbing. For a buyer, they provide a framework for checking how much of an integration is portable and how much depends on one vendor’s implementation.
An illustrative handoff, not a product test
Imagine a furniture studio preparing a commercial quote. Its assistant retrieves approved catalog information through a tool connector. It asks a supplier’s agent whether a finish is currently available, receives a dated response, and drafts a proposal for the owner.
A sensible design keeps the supplier’s answer as evidence, not as an instruction. The supplier cannot authorize a purchase, alter the studio’s customer database, or bypass the owner’s approval. A common communication protocol can carry the request; it does not decide those permissions.
Before adopting this workflow, the studio should test a supplier timeout, a contradictory availability response, and a duplicate task update. A clean demo in which everything succeeds says little about these everyday integration problems.
Questions to put on your shortlist
Ask vendors which protocol versions they implement and what operations are actually supported. “Compatible” might mean a narrow read-only connector rather than a complete task lifecycle. Request an example of cancelling work and recovering after a connection breaks.
Ask where credentials live, how access is revoked, and whether permissions can be limited by customer or project. Require task IDs and logs that connect the original request to each delegated action. Establish who pays when agents retry or call downstream services.
Finally, ask what can be exported. A reusable interface is less valuable if instructions, approval history, and business records cannot leave the platform in a usable format.
Limits and the next signal to watch
A2A’s release notes acknowledge breaking interaction changes and a migration path from earlier versions. Standards do not remove version-management work. Signed metadata can help identify a sender; it cannot prove that its answer is correct or that a requested action is appropriate.
Watch for documented cross-vendor implementations, clear migration guides, and failure-handling evidence rather than partner-logo counts. For a single assistant with one database, an ordinary API may still be simpler. Open agent standards become especially useful when they solve an actual boundary in your workflow—not when they merely add another architecture diagram.
Sources
- A2A Protocol: v1.0 release — 2026-03-12; accessed November 7, 2026.
- NIST: AI Agent Standards Initiative — 2026-02-17; accessed November 7, 2026.
- Linux Foundation: four new AAIF projects — 2026-10-22; accessed November 7, 2026.
