Agent & Protocol · Toolkit

Protocol Selection Lab

SIMULATEDVerified Jul 2, 2026· data as of Jul 2, 2026

The question every enterprise architect is asking in 2026. Describe the integration and get a call — with the runner-up and the condition that flips it, because that's the part that's actually judgment.

10,000+ MCP enterprise servers150+ A2A participating orgs

Same instrument · three industries — pick a use-case to reconfigure the run

How many systems / tools to expose?

How many agent consumers?

Coordination needs?

Governance / central control?

Reuse across teams?

Simplicity sensitivity?

Recommendation

MCP

One shared protocol for tool/resource access across many systems and consumers.

Many systems and many consumers: bespoke integrations explode as N×M. One MCP contract makes it N+M.

Runner-up: MCP + A2A hybrid. Flips to primary if you add multi-agent coordination on top of the tool sprawl.

Fit scores

Function calling3.3

MCP4.8

A2A3.2

MCP + A2A hybrid4.4

Producers × consumers

≈ 7 systems × 4 consumers28 bespoke11 protocol

Why the runner-up matters

A recommendation without a runner-up is a quiz answer. The flip condition tells leadership exactly what would change the architecture — so the decision survives the next scale-up instead of being re-litigated.

Steering-committee takeaway: The protocol isn't the decision — the number of producers and consumers is. Count those first.

How this is built

Each protocol scores against the six answers: function calling rewards small surface + single consumer; MCP rewards systems × consumers + governance + reuse; A2A rewards multi-agent coordination; hybrid tops only when MCP and A2A signals are both strong.

Primary = top score, runner-up = second; the flip condition names the runner-up's dominant driver. Protocol-landscape stats are dated config (as of 2026-07-02).

Stack: Next.js (static) + shared design system; client-side only.

Limitations: weights are heuristic judgment, not a benchmarked model; real selection also weighs vendor support, team skill, and existing investments. It structures the call and its sensitivity, not a procurement decision.