Class: ActionMCP::MCPAppRenderer

Inherits:
ActionController::Base
  • Object
show all
Defined in:
app/controllers/action_mcp/mcp_app_renderer.rb

Overview

Internal renderer for ‘ResourceTemplate#render_ui(template:)`, the entry point for MCP Apps UI views.

Inherits from ‘ActionController::Base` so it always carries the full ActionView stack regardless of whether the host Rails app is API-only. Decoupling from the host’s ‘ApplicationController` ensures `render_ui` produces a non-empty body under `config.api_only = true`.

Note: templates rendered through this controller intentionally do NOT inherit host ‘ApplicationController` filters or `helper_method` exposure (e.g., `current_user`). That decoupling is what makes `render_ui` work in API-only hosts; reintroducing host coupling would bring the bug back. Pass any data the template needs via the `locals:` argument to `ResourceTemplate#render_ui`.

Not routed. Not intended to be subclassed or used directly by host apps.