AI developer tool
WebMCP Tool Tester
Check a WebMCP tool definition and sample arguments against its input schema in your browser.
Tool Area
Everything runs in the browser.
WebMCP lets web pages describe actions as tools for browser agents. Paste one tool definition and a sample call to catch missing names, malformed schemas and invalid arguments before wiring it into an application. The current WebMCP specification is a draft; this tool checks the displayed definition, not browser runtime support.
- The test runs locally in the browser and does not execute the registered tool.
- JSON Schema validity is different from whether an action is safe or useful.
- Recheck the WebMCP draft when browser implementations change.
How to use
- Paste a JSON object with name, description and inputSchema.
- Add sample argument JSON and run the test.
- Fix the listed schema or argument errors, then test an invalid example too.
Common use cases
- Check required parameters for a new browser tool.
- Catch wrong types and unexpected fields before a browser agent calls the tool.
- Share a small reproducible failing case with teammates.
FAQ
Does this call my WebMCP tool?
No. It checks the definition and example arguments without invoking an action.
Does a passing result mean my site supports WebMCP?
No. Browser support and real registration need a separate runtime test.