Invalid prompty template. Header and content could not be parsed.

[MikeYeager]

I created a simple prompty template in VS Code and ran it with no problem. When I try to load the same template file into Semantic Kernel in VS2022, I get this exception: "Invalid prompty template. Header and content could not be parsed."

Here is my template:

---
name: JokePrompt
description: Generate a funny joke
authors:
  - Mike Yeager
model:
  api: chat
  configuration:
    type: azure_openai
  parameters:
    max_tokens: 1000
    temperature: 0.9
    top_p: 0.0
    presence_penalty: 0.0
    frequency_penalty: 0.0
sample:
  subject: square dancing
  style: monty python
---

user:
# WRITE EXACTLY ONE JOKE or HUMOROUS STORY ABOUT THE SUBJECT BELOW

JOKE MUST BE:
- G RATED
- WORKPLACE/FAMILY SAFE

NO SEXISM, RACISM OR OTHER BIAS/BIGOTRY

BE CREATIVE AND FUNNY. I WANT TO LAUGH.

Incorporate the style suggestion, if provided: '{{style}}'

+++++
{{subject}}
+++++

And here is my SK code:

var builder = Kernel.CreateBuilder()
    .AddAzureOpenAIChatCompletion(
        "MyChatTest",
        _endpoint,
        _apiKey);

var kernel = builder.Build();

var promptyFile = Path.Combine(Directory.GetCurrentDirectory(), "Prompty", "joke.prompty");

#pragma warning disable SKEXP0040 Suppress this diagnostic to proceed.
            var promptyFunction = kernel.CreateFunctionFromPrompty(promptyFile);
#pragma warning restore SKEXP0040Suppress this diagnostic to proceed.

var result = await kernel.InvokeAsync(promptyFunction, new() { ["subject"] = "fishing", ["style"] = "knock knock" });
Console.WriteLine(result);

It blows up on kernel.CreateFunctionFromPrompty()

Any ideas? Thanks in advance.

[wayliums]

what's your SK version and exact error? Also did you try right click on the prompty file and generate SK code from there?

[MikeYeager]

@wayliums

    <PackageReference Include="Microsoft.SemanticKernel" Version="1.18.0-rc" />
    <PackageReference Include="Microsoft.SemanticKernel.Abstractions" Version="1.18.0-rc" />
    <PackageReference Include="Microsoft.SemanticKernel.Prompty" Version="1.18.0-alpha" />

The exact error message is the title of this issue: Invalid prompty template. Header and content could not be parsed.

The stack trace is:

   at Microsoft.SemanticKernel.Prompty.KernelFunctionPrompty.ToPromptTemplateConfig(String promptyTemplate)
   at Microsoft.SemanticKernel.PromptyKernelExtensions.CreateFunctionFromPrompty(Kernel kernel, String promptyTemplate, IPromptTemplateFactory promptTemplateFactory)
   at SKLasVegas.Program.<Prompty>d__7.MoveNext() in C:\Users\MYeager\Dropbox\AI\SK DevIntersections Las Vegas 2024\SampleCode\SKVegas\Program.cs:line 149
   at SKLasVegas.Program.<Main>d__3.MoveNext() in C:\Users\MYeager\Dropbox\AI\SK DevIntersections Las Vegas 2024\SampleCode\SKVegas\Program.cs:line 32

The code generated by the VS Code extension is very similar to the code I'm using and produces the same result.

using Microsoft.SemanticKernel;
using Microsoft.SemanticKernel.Connectors.OpenAI;

var deployment = "";
var endpoint = "";
var key = "aoai_key";
var kernel = Kernel.CreateBuilder()
    .AddAzureOpenAIChatCompletion(deployment, endpoint, key)
    .Build();

    // update the input below to match your prompty
    KernelArguments kernelArguments = new()
    {
        { "question", "what's my question?" },
    };

var prompty = kernel.CreateFunctionFromPromptyFile("joke.prompty");
var result = await prompty.InvokeAsync<string>(kernel, kernelArguments);
Console.WriteLine(result);

[sethjuarez]

Hmmm - it looks like an implementation problem in SK. In general it should pull all the relevant params and pass it into the API call.

[MikeYeager]

Thanks @sethjuarez. I wonder if it's related to this: https://github.com/microsoft/semantic-kernel/issues/8154 I guess I'll wait for a new release of SK and see if it's fixed. If not, I will re-post in the SK repo.