How to ensure an AI agent utilizes a specific tool

Hello community,

I'm working on an AI agent that utilizes a substantial Supabase PGVector knowledge base. It frequently occurs that the AI agent doesn't engage the tool, in fact, it happens most of the time. I've instructed in the prompt to use the tool named "CompanyKnowledgeBase" (the Supabase Vector Store node), but I'm not getting any results.

Could this be due to my use of an Output parser? I'm encountering other issues with the output parser as well.

System prompt:
You are AI Coach and starting a test XYZ.

Explain what this test is about, searching the CompanyKnowledgeBase.

Then present EXACTLY the following first next statement and ask the user to give a rating from 1–5: ${$input.first().json.Item}

Follow the provided JSON schema for your response: {“type”:“object”,“properties”:{“output”:{“type”:“object”,“properties”:{“canProceedWithNextQuestion”:{“type”:“boolean”,“description”:“true in this case”},“previousScore”:{“type”:”number”,“description”:“null in this case”},“response”:{“type”:“string”,“description”:“Your response”}},
“required”:["canProceedWithNextQuestion","previousScore","response"],"additionalProperties":false}},"required":["output"],"additionalProperties":false}}

This is how the output parser schema looks like:
{
“canProceedWithNextQuestion”: “Whether we can proceed with the next question, if the last one has been answered with a score (true or false)”,
“previousScore”: “The user’s numeric answer (1–5) to the question, or null if invalid”,
“response”: “Your statement and next question or user query”
}

Can anyone offer some assistance?