OpenAPI vs MCP vs Context Plugins: Benchmarking API Integrations

A benchmark evaluated how four provider-resource conditions affected an AI agent’s addition of recurring Maxio subscription billing to the ASP.NET eShopOnWeb application, holding the model, task, host application, and grading method constant across five runs per condition. All 20 runs completed the functional API task and passed tested contract checks, but they differed substantially on a deterministic 24-check operational-readiness gate covering resilience, error hygiene, configuration security, and transport behavior. Context Plugin runs, which received curated provider knowledge, a generated SDK, and client-configuration guidance, scored 23–24 checks with a 23.2 mean, compared with means of 13.8 for the vanilla agent, 15.0 for OpenAPI, and 17.2 for Docs MCP. The strongest differences involved handling transient failures, rate limits, malformed responses, missing configuration, error-detail leakage, API drift, wire coupling, and effort required to learn the API. One examined vanilla run found the generated SDK but replaced its transport layer, losing built-in retry and backoff behavior, while plugin runs generally preserved these defaults and delivered clean typed errors. Docs MCP provided accurate API facts but sometimes truncated relevant documentation, prompting live API probing and yielding inconsistent operational implementations. The report emphasizes that its small, single-provider, single-model, single-application sample demonstrates an association between provider context and operational integration quality rather than a general causal advantage, while also noting that the plugin introduced somewhat higher code complexity and dependency surface.

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