Windmill And The First Collision In The MCP Vocabulary

Yesterday I wrote about Wistia’s nine-key agent vocabulary, which is careful, coherent, and used by exactly one company. Today, Windmill — six keys, also coherent, and the first place in this series where two companies independently reached for the same spelling and meant different things by it. Windmill’s set is x-mcp-tool, x-mcp-instructions, x-mcp-tool-include-fields, x-mcp-tool-opaque-fields, x-mcp-tool-include-query-params and x-mcp-required-fields.