> ## Documentation Index > Fetch the complete documentation index at: https://docs.cogniagent.ai/llms.txt > Use this file to discover all available pages before exploring further. # Trigger Nodes > Choose how your workflows start - manually, on a schedule, or when something happens Trigger nodes answer one question: **"What should make this workflow start?"** Maybe you want it to run when you get an email. Or every morning at 9 AM. Or when someone fills out a form on your website. Trigger nodes let you choose. Every workflow needs at least one trigger node. It's how the workflow knows when to spring into action. ## Available Trigger Nodes Run manually by clicking a button. Great for testing or one-off tasks. Run when another app or website sends you information (like form submissions). Run on a schedule - every hour, every day at 9 AM, every Monday, etc. Run when AI decides your conditions are met. Describe what you're looking for in plain English. Run when something happens in Gmail, Slack, Google Sheets, or 600+ other apps. Run when a saved value in your workflow changes. ## Which Trigger Should I Use? | I want my workflow to run when... | Use This | | ------------------------------------------------------------- | -------------------------------------------------------- | | I click a button to start it | [Start](/nodes/triggers/start) | | A form is submitted or another app sends data | [Webhook](/nodes/triggers/webhook) | | It's a certain time (daily, hourly, etc.) | [Scheduled Trigger](/nodes/triggers/scheduled-trigger) | | Something complex happens that AI can understand | [AI Trigger](/nodes/triggers/ai-lookout) | | I get an email, Slack message, or something happens in an app | [App Trigger](/nodes/triggers/app-trigger) | | A value I'm tracking changes | [On Variable Update](/nodes/triggers/on-variable-update) | ## What Information Do Triggers Provide? Each trigger brings different information into your workflow: | Trigger | What Information You Get | | ------------------ | ------------------------------------------------------------------------ | | Start | Whatever you type in when you run it | | Webhook | The data that was sent (form fields, etc.) | | Scheduled Trigger | When it ran and how many times it's run | | AI Trigger | The content that matched your conditions | | App Trigger | Depends on the app - email details, message text, spreadsheet rows, etc. | | On Variable Update | The old value, new value, and which value changed | ## Can I Have Multiple Starting Points? Yes! A workflow can have multiple trigger nodes. This means the same workflow can run: * When you click a button **and** on a schedule * When you get an email **or** a Slack message * From a form submission **and** from another app If you use multiple triggers, make sure your workflow can handle the different information each one provides. ## What Happens When I Change Trigger Settings? If your workflow is already running and you change the trigger settings, CogniAgent restarts it automatically so the changes take effect. ## Next Steps Begin with the simplest trigger Connect external systems