Google recently introduced event-driven Webhooks functionality to the Gemini API, fundamentally solving the notification problem for long-running tasks in agentic applications. As Gemini deeply penetrates agent workflow scenarios — Deep Research, long video generation, Batch API bulk processing — task duration ranges from seconds to hours. The traditional solution is for the client to constantly poll the task status, wasting bandwidth, increasing latency, and putting unnecessary load on the server. The Gemini API can now actively push HTTP POST payloads to the developer's server at the moment a task completes, strictly following the Standard Webhooks specification, ensuring idempotency and anti-replay attack protection. The dev team has provided end-to-end integration examples in the GitHub Cookbook, and the Python SDK already supports dynamic Webhook configuration. For developers using Gemini to build automated research, data pipelines, or content-generation pipelines, this means significantly reduced architectural complexity. Gemini API Webhooks is an important infrastructure-level addition, making it easier to build reliable large-scale asynchronous AI workflows, and the feature is now open to all Gemini API developers.