Several features for OpenAPI toolkit and OpenAI Assistants

[owengo]

The PR proposes to:

1. Allow OpenAI assistant to call several tools in the same run. This is quite common when the assistant decides to call a second tool after the first one
2. The OpenAPI Toolkit now supports a "x-strict": true attribute for an action. This creates a function with "strict mode".

The "strict mode" is described here: https://openai.com/index/introducing-structured-outputs-in-the-api/ , https://platform.openai.com/docs/guides/structured-outputs
Basically it allows to drastically reduce hallucination problems while generating tool calls.

The strict mode has the problem that only a subset of the json spec is supported.
One of the caveats is that all fields must be required. So the workaround is to use an "anyOf" schema with the type null.

For example if we want to make the "limit" parameter optional we can specify it like this:

{
            "name": "limit",
            "in": "query",
            "required": true,
            "schema": {
              "anyOf": [
                {
                  "type": "integer"
                },
                {
                  "type": "null"
                }
              ],
              "description": "Maximum number of records to return (1-100)",
              "title": "Limit"
            },
            "description": "Maximum number of records to return (1-100)"
          },

But then the model will call the api with "limit=null" .
So the PR adds the option to remove null parameters from the api call, so that your api backend won't choke on the null parameter.

[owengo]

Sorry but I can't reproduce the error, the cypress tests do pass, it's the nodejs cleanup action which seems to have failed

[HenryHengZJ]

can you pull the latest changes? it should be fixed