MCP is the protocol AI clients use to call tools. XivMcp is an MCP server that lives inside the game client as a Dalamud plugin and listens on loopback (http://127.0.0.1:41800/mcp), protected by a bearer token it generates on first load. Under Wine, loopback inside the game is the host's loopback, so a client on the same machine connects directly.
The v0.1.0 release offers 86 tools, 14 resources and templates and 6 prompts (the v0.1.1 test build: 155, 19 and 10): searching game data (items, recipes, quests, duties, actions, any Excel sheet), reading your character, inventory, party, location, weather forecast and chat, and local-only effects such as map flags, toasts and an in-game board where agents post what they are doing.
Combat rotations, movement and input automation of any kind are out of scope, by design.