Tools should make a change explainable.

Why this workbench exists

A required field, an enum value and a numeric bound can each change which requests a tool accepts. A text diff shows the edit; a case comparison shows a caller affected by it. ContractKit places those views beside a browser receipt check so a schema result cannot be confused with actual invocation behavior.

The workbench is free and runs its comparisons in the browser. It has no subscription, payment form, hosted AI model or account requirement. Its worked examples use synthetic inputs. It supports a deliberately documented profile and explains when you need a fuller validator or application test.

Independent identity

ContractKit is an independent developer utility on browzensew.info. It is not operated, certified or endorsed by Google, Chrome, the WebMCP specification group or any previous organization associated with this domain. Product names in technical notes identify compatibility targets.

Related products and contact

The release playbook includes optional WebTraceCheck and CleanTempMail links because a staging workflow may need a fresh browser and a non-sensitive test inbox. Those products share this project’s operator. Their services and terms are separate; they are not required to run a contract comparison.

For an error report, contact support@cleantempmail.com with a small synthetic reproduction, the browser build and the relevant page. Do not send secrets, private customer inputs or production credentials. Our methods page explains the evidence behind the claims.