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You wire your server straight into Claude Desktop, a tool call fails, and there's no way to tell if the bug is your code, your schema, or the client itself.
What you'll have at the end
A recorded pass through every tool, resource, and prompt in the MCP Inspector, each one showing a correct request and response
You need
A running MCP server, in any language, with at least one tool a client can already call, even though that call is currently failing.
Not covered
Diagnosing OAuth or transport-level failures on a remote server; this covers only calls that already connect and then fail.
Ship your first real MCP server
you need a running server to point Inspector at; build one here first if you don't already have one.
The isError flag that keeps a failed MCP tool call recoverable
once you can tell a handler bug from a schema rejection, use this to make your own isError messages the kind a model can actually recover from.
Checked 15 Aug 2026
Part of the MCP Servers Implementation cookbook