16a6df340c
## Motivation and Context The README.md documents the "Rails (mount)" integration pattern, but the repository had no runnable Rails example. This adds a minimal Rails application under examples/rails that mounts StreamableHTTPTransport at /mcp and demonstrates class-based tools and a resource with a read handler. The MCP server is built in config/routes.rb rather than in an initializer because Zeitwerk sets up autoloading after initializers run, so the tool classes in app/tools cannot be referenced there. Code reloading is disabled because the transport holds the server built at boot. The app is booted with puma instead of rackup because rackup inserts `Rack::Lint` in its development default, which rejects the capitalized response header names that the transport currently emits. Closes #44. ## How Has This Been Tested? The curl walkthrough in examples/rails/README.md has been verified end to end against the running app: initialize and the initialized notification, tools/list, tools/call for both tools, resources/list, resources/read, the standalone SSE stream, and session termination via DELETE. ## Breaking Changes None. This only adds an example application and documentation links.
27 lines
813 B
Ruby
27 lines
813 B
Ruby
# frozen_string_literal: true
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ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../Gemfile", __dir__)
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require "bundler/setup"
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require "rails"
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require "action_controller/railtie"
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require "mcp"
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module McpRailsExample
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class Application < Rails::Application
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config.load_defaults(8.0)
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# This example has no views, assets, or database.
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config.api_only = true
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# The MCP server is built once at boot (config/routes.rb) and holds references to the tool classes in app/tools,
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# so code reloading is disabled; restart the server after changing tool or resource code.
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# A reloading app would need `config.to_prepare` and a way to swap the transport's server instead.
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config.enable_reloading = false
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config.eager_load = true
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config.logger = ActiveSupport::Logger.new($stdout)
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end
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end
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