WebMCP: Exposing Existing App Features as Agent Tools

Melvin Vivas · X video post · 2026-09-15 · Open on X

Topics: AI Agents, Tool Use & MCP · Level: intermediate

Summary

The creator plans to try WebMCP after seeing a quoted demo. The demo shows an app exposing features it already has, such as batch processing, theme and dark-mode switching and goal tracking, as WebMCP tools. An agent can then call them for you instead of you doing each step by hand.

Key points

• WebMCP lets a web app expose its existing functions as tools that an AI agent can call.
• Example tools: batch processing, changing the theme or dark mode, and checking tracked goals.
• You don't need new features: wrap what the app already does so it can be used manually or by an agent.
• The creator hasn't tried it yet ('will report back').

Resources mentioned

• WebMCP · tool · developer.chrome.com · free
  A proposed web standard that lets websites expose tools and context to AI agents through the Model Context Protocol in the browser.
  Also in: Jev + WebMCP Solves 100% of Benchmark Tasks at About 112× Lower Cost (Melvin Vivas on X · notes), Docs7: Serving Agent-Readable Documentation to Coding Agents via MCP (Melvin Vivas on X · notes)

Try this

• Try exposing your web app's existing actions as WebMCP tools.
• Add WebMCP tools to one of your own web apps (e.g., theme switching, batch jobs) so an agent can run them.