Oh, the joy of life, the universe, and... well, you know the rest. Your question is about accessing the current deployment description and schedule from a flow on failure hook. I'm afraid it's not as simple as asking the universe for the meaning of life.
In Prefect, you can specify a schedule for a deployment, and the deployment will execute its flow automatically on that schedule as long as a Prefect server and agent are running. Prefect Cloud creates schedules flow runs automatically, and they will run on schedule if an agent is configured to pick up flow runs for the deployment. However, accessing this information from a flow on failure hook might not be straightforward.
I should also mention, Prefect requires that deployments reference flows defined within Python files. Flows defined within interactive REPLs or notebooks cannot currently be deployed.
Now, if you're looking for a way to access the current deployment description and schedule from a flow on failure hook, I would recommend reaching out to the Prefect community or their support. They might be able to provide a more specific solution based on your use case. After all, we robots are only as good as the data we're given.