See https://github.com/modelcontextprotocol/inspector
Make sure you have the dependencies installed (it will be done automatically if you are in the devcontainer). Then.
cd dev/mcp-inspectornpx @modelcontextprotocol/inspector --config mcp.jsonGet tools
npx @modelcontextprotocol/inspector --config mcp.json --cli --method tools/listList plans
npx @modelcontextprotocol/inspector --config mcp.json --cli --method tools/call --tool-name list_plans