# Practical and Useful Patterns with ADK Long-running tasks failing midway and restarting from scratch? That's a thing of the past! 💪 ADK's Resume Agents feature enables checkpoint-based resumption from the exact point of interruption. It supports HITL approval-pending flows too, dramatically improving agent reliability. ## 📌 Title Resume Agents — Checkpoint-Based Workflow Resumption ## 🔗 URL ## 🧩 Overview Resume Agents allows interrupted ADK workflows to continue from where they stopped rather than restarting entirely. The feature uses event logging and state preservation to track progress, enabling skipping of successful steps and seamless resumption of HITL (Human-in-the-Loop) approval-pending flows. ## 🛠 How to Use Enable resumability through `ResumabilityConfig`: Import `App` from `google.adk` and `ResumabilityConfig` from `google.adk.runtime`. Pass `resumability_config=ResumabilityConfig(is_resumable=True)` to the `App` constructor to enable checkpoint-based resumption. Also provide the `name` for the application and the `root_agent` instance. Resume by specifying the same `invocation_id`: To resume, call ` with the same `invocation_id` used during the original execution. ## 🏗 Practical Usage - **Sequential Agent**: Automatically identifies the next sub-agent to run on resume - **Loop Agent**: Continues from the last completed iteration - **Parallel Agent**: Re-executes only incomplete sub-agents - **HITL Approval Flow**: Workflows paused for human approval automatically resume after approval is granted - Custom agents extend `BaseAgentState` with checkpoints after each workflow step ## 💡 Use Cases - Recovery from failures in multi-hour data processing pipelines - Expense approval or contract review workflows requiring human sign-off - Continuing partially successful multi-step API integrations - Minimizing downtime during agent failures in production ## ⚠️ Caveats - Tools execute **at least once** and may run multiple times during resumption — ensure idempotency - Modifying workflow definitions between interruption and resume is not supported - Web UI and CLI resumption are not currently supported ## ✨ Resilient agents are a must for production workloads. Leverage Resume Agents to build workflows that gracefully survive failures! 🚀 #ADK# #AIAgent#