1# Timer Recipe
2 
3Scheduled/cron trigger for periodic task execution.
4 
5## Template Selection
6 
7Resource filter: `timer`  
8Discover templates via MCP or CDN manifest where `resource == "timer"` and `language` matches user request.
9 
10## Cron Expressions
11 
12Some templates define the schedule via an app setting reference `%TIMER_SCHEDULE%` so the cron expression is configurable without code changes. Set the `TIMER_SCHEDULE` app setting to the desired expression.
13 
14| Schedule | Expression |
15|----------|------------|
16| Every 5 minutes | `0 */5 * * * *` |
17| Every hour | `0 0 * * * *` |
18| Every day at midnight | `0 0 0 * * *` |
19| Every Monday at 9am | `0 0 9 * * 1` |
20| Every 30 seconds | `*/30 * * * * *` |
21 
22> Azure uses 6-part cron expressions (with seconds). See [Azure Functions timer trigger](https://learn.microsoft.com/en-us/azure/azure-functions/functions-bindings-timer#ncrontab-expressions) for full syntax reference.
23 
24## Troubleshooting
25 
26### Timer Not Firing
27 
28**Cause:** Invalid cron expression or function app not running.  
29**Solution:** Verify cron syntax; check function app is started and healthy.
30 
31### Duplicate Executions
32 
33**Cause:** Multiple instances running the same timer.  
34**Solution:** Timer triggers use Storage lease to ensure single execution. Verify `AzureWebJobsStorage` is configured.
35 
36## Eval
37 
38| Path | Description |
39|------|-------------|
40| [eval/summary.md](eval/summary.md) | Evaluation summary |
41| [eval/python.md](eval/python.md) | Python evaluation results |
42