echo
plain tool.
How to use it
echo is exposed by the Inspector MCP server. Add the server to your MCP client (Claude Desktop, Cursor, Windsurf and others), and the echo tool becomes available to the model automatically. See the full listing for setup details and every tool this server provides.
Install Inspector
$
npx @modelcontextprotocol/inspector # web UI (default)Other tools in Inspector (3)
get_weather
a valid x-mcp-header: "City" annotation on its city argument.
invalid_header_tool
an annotation using the header name "Bad Header". The space makes it an invalid RFC 9110 token, so the whole tool definition is invalid.
trigger_invalid_params
answered with a real -32602 Invalid params error whose message is not about a missing tool.