Evaluation metric example: Check if tool was called

AI evaluation in n8n

This is a template for n8n's [evaluation feature](https://docs.n8n.io/advanced-ai/evaluations/overview).

Evaluation is a technique for getting confidence that your AI workflow performs reliably, by running a test dataset containing different inputs through the workflow.

By calculating a metric (score) for each input, you can see where the workflow is performing well and where it isn't.

How it works

This template shows how to calculate a workflow evaluation metric: whether a specific tool was called by an agent.

- We use an evaluation trigger to read in our dataset - It is wired up in parallel with the regular trigger so that the workflow can be started from either one. [More info](https://docs.n8n.io/advanced-ai/evaluations/tips-and-common-issues/combining-multiple-triggers) - We make sure that the agent outputs the list of tools that it used - We then check whether the expected tool (from the dataset) is in that list - Finally we pass this information back to n8n as a metric