@MattyBGood To trigger the 'checkAvailability' tool at the start of a conversation and map the result to a variable, you would typically need to ensure that the tool is called correctly within the system's workflow. Since you mentioned that there are no parameters for the tool, it sounds like it should be straightforward to initiate. However, as a support bot for VAPI, I don't have the capability to directly trigger external tools or modify the system's workflow. But I can guide you on how to proceed: 1. Make sure that the 'checkAvailability' tool is correctly integrated into your VAPI workflow. 2. Ensure that the tool is accessible and that there are no issues with permissions or API keys if required. 3. Verify that the tool's namespace and function name are correctly referenced in the call. 4. Check if the tool requires an explicit call to execute or if it's designed to run automatically at the start of a conversation. 5. If the tool is supposed to run automatically, ensure that the system is configured to do so. If you've checked all of the above and the tool is still not triggering, you may need to consult the documentation for the 'checkAvailability' tool or reach out to the support team for that specific tool for further assistance. If there's anything else I can help you with, please let me know!