flutter3d_mcp_kit

What every flutter3d MCP server shares, written once:

• OfferedTool<S, A> — a tool and the code that runs it, one value, so a tool that is offered is a tool that has a body.
• ToolTableServer<S, A> — a server that is a list of those over one session.
• Answer and PictureAnswer — what a call did and the sentence to say about it, with resultOf and pictureResultOf turning a refusal into an error result the agent reads rather than a failed server.
• LoopbackMcpServer — any of those servers over 127.0.0.1 HTTP with a per-server token, for an application that wants to hand an agent the session a person already has open.

flutter3d_editor_mcp, flutter3d_model_mcp and flutter3d_sim_mcp (with both of its servers) are built on it. Plain Dart: no Flutter SDK is needed to start a server that uses it.