Bug: MCP Inspector on latest@v2.1.0 doesn't attach `Mcp-Name` in the request header

[Hritik003]

Which version line?

v2 — current (@modelcontextprotocol/inspector@latest)

Which client?

Web

Inspector version

2.1.0

Node version

v23.11.0

Operating system (and browser, for the web client)

macos

Transport

Streamable HTTP

MCP server under inspection

Server: github
Protocol era: modern
oauth: no

Steps to reproduce

1. Run npx mcpinspector@latest
2. attach a server
3. hit tool/call

Expected behavior

Tool call to be successful

Actual behavior

Tool Error
Error POSTing to endpoint: {"error":{"code":-32603,"message":"backend error: backend returned status 400: {\"jsonrpc\":\"2.0\",\"id\":7,\"error\":{\"code\":-32020,\"message\":\"missing required Mcp-Name header for method \\\"tools/call\\\"\"}}"},"id":7,"jsonrpc":"2.0"}

Logs, errors, or screenshots

Already prototyped a fix?

No response

Before you submit

• I searched existing issues and this is not a duplicate.
• This is not a security vulnerability report (those go through the private advisory process).