Response returns JSON and complies with the openapi: 3.0.0 standard

[Davider]

I am configuring an AI robot that can call LA's HTTP service, but the response needs to be returned in JSON and comply with the openapi: 3.0.0 standard.

I tried the following code, but the robot is unable to retrieve the response. What do I need to do?
 

Code:

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// class "Functions2.cs"
using Newtonsoft.Json.Linq;

static partial class Functions
{
    public static string GetFilePath(string FileName)
    {
        JObject jsonObject = JObject.Parse(FileName); 
        
        string fileName = (string)jsonObject["FileName"]; 
        
        string jsonPath = $$"""
{
    "Path": "D:\{{fileName}}.pdf"
}
""";
        //print.it(jsonPath);
        return jsonPath;
    }
}

Schema:

Code:

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openapi: 3.0.0
info:
  title: File Path API
  version: 1.0.0
  description: API to retrieve file paths based on file names.
servers:
  - url: http://www.xxxxx.xyz:4455/
paths:
  /GetFilePath:
    get:
      summary: Get file path
      operationId: GetFilepath
      parameters:
        - name: FileName
          in: query
          schema:
            type: string
            example: 'cookbook'
      responses:
        '200':
          description: Successful response with file path.
          content:
            application/json:
              schema:
                type: object
                properties:
                  filePath:
                    type: string
                    description: The path of the file.
        default:
          description: Unexpected error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
components:
  schemas:
    Error:
      type: object
      properties:
        code:
          type: integer
          format: int32
        message:
          type: string

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I'm using the feature to create agents available at the following link. It's free and accessible to users worldwide.
https://chatglm.cn/main/alltoolsdetail

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The created agent can use an API, similar to ChatGPT's GPTS. I successfully called the HTTP service in LA, but it failed to retrieve the return value.
Has anyone attempted something similar in GPTS?