Review a modern MCP request for JSON-RPC structure, current protocol metadata and legacy session or initialize usage.
The modern MCP core no longer depends on the previous initialize session lifecycle. Requests carry protocol context with the request itself so they can be handled independently.
Check whether an MCP JSON-RPC request follows the stateless 2026-07-28 request model.
Use MCP Stateless Request Checker as a focused pre-flight utility while building, reviewing or debugging an MCP integration. Paste the relevant configuration, protocol message, metadata, schema or value into the tool and review the returned findings before the same data reaches a production client or server.
Protocol checks are especially useful when debugging interoperability between different MCP clients, servers, gateways and SDK versions. The tool analyzes the data you provide and does not initiate a live MCP exchange.
A clean result means the input passed the rules implemented by this utility. It does not guarantee application security, protocol interoperability or correct business behavior. Test important integrations against the exact MCP client, SDK, gateway and server versions used in your deployment.
MCP Server Discover Request Builder