Registering your first WebMCP tool takes five minutes - shipping it responsibly takes deliberate design. This session moves past the basics into the patterns that matter for real-world, multi-page web applications: dynamic tool registration tied to route and state changes, gating sensitive actions behind explicit user confirmation, graceful degradation for browsers without WebMCP support, and defense-in-depth validation that treats agent input the same as untrusted user input. In a live demo of a multi-tool SPA, we'll show tools registering and unregistering as views change, walk through edge cases like duplicate names and circular schemas, and demonstrate a fallback strategy that keeps the app fully functional without an agent. You'll also see how the WebMCP agent skill's detection scripts and templates accelerate safe adoption across teams.

Learning Outcomes:
- Understand what WebMCP is, how it differs from server-side MCP, and why the browser is a natural tool-hosting surface for AI agents.
- Dynamically register and unregister tools in response to route changes, UI state transitions, and component lifecycles.
- Require explicit user confirmation for destructive or sensitive tool actions invoked by agents using the built-in interaction request mechanism.
- Apply defense-in-depth validation inside tool callbacks — treating agent-supplied input as untrusted — and return descriptive error objects that help agents self-correct.
- Build graceful degradation paths that detect missing WebMCP support, unsupported browsers, and non-secure contexts without breaking the standard user experience.
- Adopt the WebMCP AI agent skill's workspace detection script, registration template, and compatibility reference to enforce consistent WebMCP patterns across a development team.