{"record":{"id":"4f8a9e46ba3f9a8c","repo":"microsoft/semantic-kernel","slug":"no-arguments-are-provided-for-fullyresolvedfuncti","errorCode":null,"errorMessage":"No arguments are provided for {fullyResolvedFunctionName}.","messagePattern":"No arguments are provided for (.+?)\\.","errorType":"exception","errorClass":"ArgumentException","httpStatus":null,"severity":"error","filePath":"dotnet/src/Extensions/PromptTemplates.Handlebars/Helpers/KernelHelpers/KernelFunctionHelpers.cs","lineNumber":77,"sourceCode":"            handlebarsInstance,\n            fullyResolvedFunctionName,\n            (Context context, Arguments handlebarsArguments) =>\n            {\n                // Get the parameters from the template arguments\n                if (handlebarsArguments.Length is not 0)\n                {\n                    if (handlebarsArguments[0].GetType() == typeof(HashParameterDictionary))\n                    {\n                        ProcessHashArguments(functionMetadata, executionContext, (IDictionary<string, object>)handlebarsArguments[0], nameDelimiter);\n                    }\n                    else\n                    {\n                        ProcessPositionalArguments(functionMetadata, executionContext, handlebarsArguments);\n                    }\n                }\n                else if (functionMetadata.Parameters.Any(p => p.IsRequired))\n                {\n                    throw new ArgumentException($\"No arguments are provided for {fullyResolvedFunctionName}.\");\n                }\n\n                KernelFunction function = kernel.Plugins.GetFunction(functionMetadata.PluginName, functionMetadata.Name);\n\n                // Invoke the function and write the result to the template\n                var result = InvokeKernelFunction(kernel, function, executionContext, cancellationToken);\n\n                if (!allowDangerouslySetContent && result is string resultAsString)\n                {\n                    result = HttpUtility.HtmlEncode(resultAsString);\n                }\n\n                return result;\n            });\n    }\n\n    /// <summary>\n    /// Checks if handlebars argument is a valid type for the function parameter.","sourceCodeStart":59,"sourceCodeEnd":95,"githubUrl":"https://github.com/microsoft/semantic-kernel/blob/c028a0c7dc4f0814cdcbaba9d998f187a41197bf/dotnet/src/Extensions/PromptTemplates.Handlebars/Helpers/KernelHelpers/KernelFunctionHelpers.cs#L59-L95","documentation":"Thrown when a Handlebars helper invoking a kernel function finds that the function has required parameters but no arguments were provided in the template call. The helper refuses to invoke the function because required inputs are missing.","triggerScenarios":"In KernelFunctionHelpers, when a function metadata has parameters with IsRequired and the template neither supplied hash arguments nor positional arguments, the code throws before attempting invocation.","commonSituations":"Writing a Handlebars template that calls a function helper without passing the required arguments, or mismatching the function signature (renamed/removed parameters) so the template no longer supplies them.","solutions":["Update the Handlebars template to pass all required parameters (e.g., {{Plugin-Function param=\"value\"}}).","Verify the function's required parameters via its metadata and ensure each is supplied in the template.","If a parameter is optional, mark it IsRequired=false in the function definition."],"exampleFix":"// before\n{{MyPlugin-DoWork}}\n// after\n{{MyPlugin-DoWork input=\"hello\" count=3}}","handlingStrategy":"validation","validationCode":"var requiredParams = functionMetadata.Parameters.Where(p => p.IsRequired).ToList();\nif (requiredParams.Count > 0 && argumentsSupplied == 0)\n    throw new InvalidOperationException($\"Function {functionMetadata.Name} requires: {string.Join(\", \", requiredParams.Select(p => p.Name))}.\");","typeGuard":"public static bool HasAllRequiredArgs(KernelFunctionMetadata meta, IEnumerable<string> supplied) =>\n    meta.Parameters.Where(p => p.IsRequired).All(p => supplied.Contains(p.Name));","tryCatchPattern":"try\n{\n    var result = await template.RenderAsync(kernel, arguments).ConfigureAwait(false);\n}\ncatch (ArgumentException ex) when (ex.Message.Contains(\"No arguments are provided\"))\n{\n    _logger.LogError(ex, \"Template function call missing required arguments.\");\n    throw;\n}","preventionTips":["Review function metadata required parameters when authoring templates.","Keep templates in sync with function signature changes.","Lint templates against function metadata in CI."],"tags":["handlebars","prompt-templates","function-invocation","missing-arguments"],"backgroundTag":null,"analyzedSha":"c028a0c7dc4f0814cdcbaba9d998f187a41197bf","analyzedAt":"2026-08-13T13:48:05.040Z","schemaVersion":2},"datasetVersion":"2026-08-13T14:17:21.547Z"}