Tools belong to this page
Registration, discovery, schema display, and execution all use the native page API.
WebMCP Playground
Test the agent-native web.
Discover real page tools, inspect their contracts, execute controlled examples, and watch state, approval, and API boundaries respond.
Registering page toolsChecking document.modelContext…
Open Guard Inspector →Native tool console
Inspect. Validate. Execute.
This console uses the same browser discovery and JSON Schema validation principles as Guard, scoped to the harmless tools registered by this page.
Native Playground tools are unavailable here.
Native discovery and execution require a compatible Chrome build with WebMCP testing enabled. The Guard Inspector can still inspect pasted tool descriptors.
What to verify
Real behavior, bounded effects.
Arguments match the contract
Examples are generated from live schemas and checked before execution.
Effects stop for permission
The page—not tool input—owns the human checkpoint.
Content stays content
Instruction-like text is identified without becoming executable direction.