Add tool_choice to createOpenAIToolsAgent

[SebastianStehle]

Checked

• I searched existing ideas and did not find a similar one
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• I've clearly described the feature request and motivation for it

Feature request

The tool_choice parameter is supported by OpenAI (not sure about other models) and can be used to force using a tool.

It seems that this parameter is available when you use bind, but not for createOpenAIToolsAgent. It would be great to support this parameter as well.

Motivation

Sometimes models do not use tools and you have to force them with the right prompts. This requires some knowledge that we cannot expect from end users in a chat application. Therefore it makes sense to enforce a tool, if it is supported by the model.

Proposal (If applicable)

No response

[KeenanFernandes2000]

When setting up my agent, I use both the system prompt and a description of the tool to get the model to use the appropriate tools, more often than not the AI is able to utilize the right tool. Furthermore, using a schema will let the agent know what is required before initiating the tool, these work really good with GPT4.

new DynamicStructuredTool({
name: "imgGenTool",
description: "Tool to generate images",
schema: z.object({
imgDesc: z.string().describe("Description of the image to generate"),
}),
func: async function ({ imgDesc }): Promise {
// Code to generate image goes here
},
}),