trigger_invalid_params

MCP tool from Inspector by modelcontextprotocol

answered with a real -32602 Invalid params error whose message is not about a missing tool.

How to use it

trigger_invalid_params is exposed by the Inspector MCP server. Add the server to your MCP client (Claude Desktop, Cursor, Windsurf and others), and the trigger_invalid_params 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)

FULL INSPECTOR LISTING

Other tools in Inspector (3)

echo

plain tool.

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.