Semantic Kernel dotnet-1.80.0 リリースSemantic Kernel dotnet-1.80.0

Microsoft's Semantic Kernel team has published version 1.80.0 of its .NET SDK, a maintenance-focused release that refines how the framework handles OpenAPI-based plugins and function selection with Google's Gemini models. For developers building AI agents on .NET, the update tightens two integration points that matter for tool calling and external API access, alongside routine dependency housekeeping.

Semantic Kernel is Microsoft's open-source SDK for embedding large language models into applications and orchestrating agents that can call functions, query data, and invoke external services. Distributed across .NET, Python, and Java, it sits in a crowded field of agent frameworks that includes LangChain, LlamaIndex, and Microsoft's own AutoGen, which the company has been gradually converging with Semantic Kernel. The .NET line is versioned separately and ships frequent incremental releases, and 1.80.0 continues that cadence.

The most notable behavioral change addresses the Gemini connector. According to the release notes, the update makes the connector honor the FunctionChoiceBehavior function list. FunctionChoiceBehavior is Semantic Kernel's mechanism for controlling how a model decides which functions, or tools, to invoke during a completion — for example, letting the model choose automatically, requiring a specific call, or disabling function calls entirely. The behavior can also be scoped to an explicit subset of functions. The fix appears to ensure that when a developer supplies such a list, the Gemini connector actually restricts the advertised functions to that set rather than exposing others. This is the kind of correctness fix that matters when agents are wired to many plugins but should only reach for a narrow selection in a given step.

The release also updates the default configuration for the OpenAPI HTTP client. Semantic Kernel lets developers import an OpenAPI specification and expose its operations to a model as callable functions, turning existing REST APIs into agent tools without hand-writing wrappers. Changes to the HTTP client defaults — such as headers, timeouts, or handler configuration — can influence how those generated calls behave in production, though the release summary does not enumerate the specific values. Teams that rely heavily on OpenAPI plugins may want to review the change to confirm it aligns with their expectations.

Rounding out the release, the maintainers bumped the Testcontainers packages used in the project's test suite. Testcontainers is a widely used library for running disposable Docker containers during integration tests, and keeping it current is standard maintenance that helps ensure the framework's tests run against supported dependency versions. The package version itself was raised to 1.80.0 as part of the release process, and the commit history indicates additional dependency bumps beyond those detailed here.

For context, function calling — sometimes called tool use — has become a central capability of modern agent frameworks, and provider-specific connectors each translate a shared abstraction into the underlying API's format. Because Gemini, OpenAI, Azure OpenAI, and other backends expose function calling differently, connector-level fixes like this one are common as the framework works to keep behavior consistent across providers. FunctionChoiceBehavior itself is the newer, unified API that Semantic Kernel introduced to replace earlier provider-specific tool-calling settings, so bringing the Gemini connector fully in line with it is a step toward cross-provider parity rather than a new feature.

Adjacent to these connector concerns, OpenAPI import remains one of the more practical ways to extend an agent's reach, since it lets organizations reuse APIs they already document and operate. Combined with the framework's plugin model, it allows a single agent to blend native code functions, remote services, and model-driven planning. Adjustments to the HTTP client that carries those requests are therefore relevant to reliability, even when they are not headline-grabbing.

Developers can obtain the update through NuGet, where Semantic Kernel's packages are published, and the full commit list is available on the project's GitHub releases page. As with prior point releases, 1.80.0 appears aimed at stability and incremental refinement rather than major new capabilities, and most applications should be able to adopt it with minimal changes. Those using the Gemini connector with scoped function lists, or leaning on OpenAPI-derived plugins, are the most likely to notice a direct difference in behavior after upgrading.