Overnight releases from three hyperscalers point the same way: agent runtimes that discover tools via a common manifest format, not bespoke plugins. Early adopters can register a single OpenAPI-style descriptor and expose the same actions across vendor sandboxes. The pitch is developer speed. The real play is switching costs for whoever hosts the longest-running agent sessions.
Partner docs will sell “write once, run anywhere.” Differentiation will still land on observability, cost controls, and data residency. If you are shipping an assistant this quarter, list which tools are proprietary versus portable before a vendor SDK sits on the critical path.