Document .openhands/stop.sh repository hook

openhands/usage/customization/repository.mdx

@@ -3,7 +3,7 @@
 description: You can customize how OpenHands interacts with your repository by creating a `.openhands` directory at the root level.
 ---
 
 ## Skills (formerly Microagents)
 
 Skills allow you to extend OpenHands prompts with information specific to your project and define how OpenHands
 should function. See [Skills Overview](/overview/skills) for more information.
@@ -45,3 +45,23 @@
 
 exit 0
 ```
+
+
+## Stop Script
+
+You can add a `.openhands/stop.sh` file, which will run every time the agent finishes a task (i.e., when the agent emits an `AgentFinishAction` / transitions to the `FINISHED` state).
+
+- Runs inside the sandbox/runtime environment
+- Runs from the repository root (best-effort via `git rev-parse --show-toplevel`)
+- Times out after 10 minutes
+
+For example:
+
+```bash
+#!/bin/bash
+
+# Example: write a simple summary marker for downstream automation
+
+echo "OpenHands finished at $(date -Iseconds)" >> .openhands/finish.log
+```
+