Web Automation: Webhooks, Triggers & Playwright MCP
The modern web-automation stack in one course: webhooks, triggers (schedules, events, polling), browser automation with Playwright, the Playwright MCP that lets Claude and other AI assistants drive a real browser, and every major alternative: Selenium, Puppeteer, Cypress, Chrome DevTools MCP, Browser Use, Stagehand, Skyvern, Browserbase, Apify, n8n, Zapier, Make, Pipedream, RPA and AI browsers.
Web Automation: Webhooks, Triggers & Playwright MCP
The modern web-automation stack in one course: webhooks, triggers (schedules, events, polling), browser automation with Playwright, the Playwright MCP that lets Claude and other AI assistants drive a real browser, and every major alternative: Selenium, Puppeteer, Cypress, Chrome DevTools MCP, Browser Use, Stagehand, Skyvern, Browserbase, Apify, n8n, Zapier, Make, Pipedream, RPA and AI browsers.
In one line
Webhooks tell your system the moment something happens; triggers decide when automations run; browser automation does the clicking when there's no API; and the Playwright MCP lets an AI assistant like Claude use a real browser for you. Together they're the most-used web automation stack in 2026.
The 10 classes
The web-automation stack: APIs, webhooks, triggers, browsers
See how the pieces fit, and pick the right one for each job.
- Triggers decide when; webhooks and APIs connect systems; browsers click when nothing else works.
- Prefer APIs and webhooks for reliability.
- AI agents sit on top for flexible tasks.
Webhooks explained (with real examples)
Understand webhooks and receive your first one.
- Webhooks push events to you in real time.
- The body is usually JSON describing the event.
- Test with a webhook inspector before writing code.
Building reliable webhook receivers
Verify, process and retry webhooks safely in production.
- Verify signatures, respond fast, be idempotent.
- Expect retries and out-of-order events.
- Log and replay for debugging.
Triggers: schedules, events, polling and manual
Choose how and when automations start.
- Webhooks for instant, schedules for batches, polling when nothing else exists.
- Watch time zones in cron (IST vs UTC).
- Add manual triggers for testing.
Playwright for browser automation
Automate any website reliably with Playwright.
- Playwright = fast, reliable, multi-browser automation.
- codegen writes your first script.
- Saved login state + traces + schedules make it production-ready.
Playwright MCP: let Claude and other AI assistants use a browser
Install and use the Playwright MCP server with Claude Code, Claude Desktop, Cursor and VS Code.
- Playwright MCP = AI-driven real browser via MCP tools.
- One command adds it to Claude Code; JSON config for other clients.
- Great for QA, research and generating tests; keep it sandboxed.
Other browser-automation frameworks and MCPs
Know the alternatives and when each wins.
- Playwright is the default for new work.
- Selenium remains common in enterprises.
- Pick by team skills and browsers needed.
AI browser agents and cloud browsers
Use AI-native automation tools and hosted browsers at scale.
- AI agents handle changing pages; code handles stable steps.
- Cloud browsers scale and isolate sessions.
- Always measure reliability and cost.
Workflow platforms: n8n, Zapier, Make, Pipedream, RPA and scrapers
Run webhooks, triggers and browser steps as complete workflows.
- n8n/Zapier/Make/Pipedream orchestrate triggers and actions.
- Apify and RPA tools cover scraping and enterprise desktop work.
- Combine webhook + workflow + browser step + notification.
Production: security, legality, monitoring, evals and capstone
Run web automations safely and prove they work.
- Secure, legal, approved, monitored, evaluated.
- Every failure leaves a trace and an alert.
- Ship a capstone you can demo in interviews.
Interview questions
What is a webhook?
An HTTP request an app sends to your URL when an event happens, so you get updates instantly instead of polling.
How do you secure a webhook endpoint?
Verify the provider's HMAC signature on the raw body, use HTTPS, keep the secret in environment settings, respond fast, and process idempotently.
Webhook vs polling?
Webhooks push instantly and save calls; polling checks repeatedly and adds delay but works when no webhooks exist.
What is idempotency and why does it matter?
Processing the same event twice has no extra effect; needed because providers retry and may send duplicates.
What is the Playwright MCP?
An MCP server by Microsoft that exposes browser actions (navigate, click, type, snapshot) so AI assistants like Claude can use a real browser.
Playwright vs Selenium?
Playwright: newer, faster, auto-waiting, multi-browser, great tooling and MCP. Selenium: mature standard with broad language and grid support, common in existing enterprise suites.
When would you use an AI browser agent instead of a script?
When pages change often or tasks vary; keep scripts for stable steps and add AI for the messy parts, with evals and approvals.
How do you schedule an automation for 9 am IST on weekdays?
Cron '0 9 * * 1-5' in IST, or '30 3 * * 1-5' if the server runs in UTC.
