ADK for TypeScript: API Reference
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    Class APIHubToolset

    Builds one tool per operation of an API registered in API Hub.

    The toolset fetches an OpenAPI spec from API Hub, parses it as YAML or JSON, and hands it to an OpenAPIToolset, which produces a RestApiTool for each operation.

    const toolset = new APIHubToolset({
      apihubResourceName:
        'projects/my-project/locations/us-central1/apis/my-api',
    });
    const agent = new LlmAgent({
      name: 'api_agent',
      model: 'gemini-flash-latest',
      tools: [toolset],
    });

    By default the spec is fetched when the toolset is constructed. A constructor cannot wait for the request, so a failure is reported by the first call to getTools, and every later call reports the same failure.

    With lazyLoadSpec, the spec is fetched on the first call to getTools. A successful result is kept, including a spec that produced no tools. A failed fetch is not kept, so the next call fetches again.

    Hierarchy (View Summary)

    "[BASE_TOOLSET_SIGNATURE_SYMBOL]": true
    description: string

    The toolset description, filled in from the spec when empty.

    name: string

    The toolset name, filled in from the spec when empty.

    prefix?: string
    toolFilter:
        | string[]
        | ((tool: BaseTool, readonlyContext?: ReadonlyContext) => boolean)

    • Closes the toolset.

      NOTE: This method is invoked, for example, at the end of an agent server's lifecycle or when the toolset is no longer needed. Implementations should ensure that any open connections, files, or other managed resources are properly released to prevent leaks.

      Returns Promise<void>

      A Promise that resolves when the toolset is closed.

    • Processes the outgoing LLM request for this toolset. This method will be called before each tool processes the llm request.

      Use cases:

      • Instead of let each tool process the llm request, we can let the toolset process the llm request. e.g. ComputerUseToolset can add computer use tool to the llm request.

      Parameters

      • _toolContext: Context

        The context of the tool.

      • _llmRequest: LlmRequest

        The outgoing LLM request, mutable this method.

      Returns Promise<void>

    Constructors
    Properties
    Methods