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Add Model Context Protocol support with fast-mcp #78
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f4ebf2e
Add Model Context Protocol support
jjmata d6a577d
Lint noise
jjmata 6ac9292
Expects and array
jjmata ccf8eff
Move MCP.md to api/ folder
jjmata d15311f
Add CC implementation plan to branch
jjmata 6dd373d
Merge branch 'main' into codex/add-model-control-protocol-support
jjmata 6d674e3
Add a couple of simple tests to prove the concept
jjmata eaf2420
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,5 @@ | ||
| # frozen_string_literal: true | ||
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| class ApplicationResource < ActionResource::Base | ||
| # write your custom logic to be shared across all resources here | ||
| end |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,5 @@ | ||
| # frozen_string_literal: true | ||
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| class ApplicationTool < ActionTool::Base | ||
| # write your custom logic to be shared across all tools here | ||
| end |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,27 @@ | ||
| # frozen_string_literal: true | ||
|
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| class FetchAccountsBalanceTool < ApplicationTool | ||
| def call(account_type: nil) | ||
| family = Current.family | ||
| return { error: "No family found" } unless family | ||
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| accounts = family.accounts | ||
| accounts = accounts.where(accountable_type: account_type) if account_type.present? | ||
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| account_data = accounts.map do |account| | ||
| { | ||
| id: account.id, | ||
| name: account.name, | ||
| type: account.accountable_type, | ||
| balance: account.balance.to_f | ||
| } | ||
| end | ||
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| total_balance = accounts.sum(&:balance).to_f | ||
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| { | ||
| accounts: account_data, | ||
| total_balance: total_balance | ||
| } | ||
| end | ||
| end |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,43 @@ | ||
| # frozen_string_literal: true | ||
|
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| # FastMcp - Model Context Protocol for Rails | ||
| # This initializer sets up the MCP middleware in your Rails application. | ||
| # | ||
| # In Rails applications, you can use: | ||
| # - ActionTool::Base as an alias for FastMcp::Tool | ||
| # - ActionResource::Base as an alias for FastMcp::Resource | ||
| # | ||
| # All your tools should inherit from ApplicationTool which already uses ActionTool::Base, | ||
| # and all your resources should inherit from ApplicationResource which uses ActionResource::Base. | ||
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| # Mount the MCP middleware in your Rails application | ||
| # You can customize the options below to fit your needs. | ||
| require "fast_mcp" | ||
|
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| FastMcp.mount_in_rails( | ||
| Rails.application, | ||
| allowed_origins: Rails.application.config.hosts.to_a, | ||
| name: Rails.application.class.module_parent_name.underscore.dasherize, | ||
| version: "1.0.0", | ||
| path_prefix: "/mcp", # This is the default path prefix | ||
| messages_route: "messages", # This is the default route for the messages endpoint | ||
| sse_route: "sse" # This is the default route for the SSE endpoint | ||
| # Add allowed origins below, it defaults to Rails.application.config.hosts | ||
| # allowed_origins: ['localhost', '127.0.0.1', '[::1]', 'example.com', /.*\.example\.com/], | ||
| # localhost_only: true, # Set to false to allow connections from other hosts | ||
| # whitelist specific ips to if you want to run on localhost and allow connections from other IPs | ||
| # allowed_ips: ['127.0.0.1', '::1'] | ||
| # authenticate: true, # Uncomment to enable authentication | ||
| # auth_token: 'your-token', # Required if authenticate: true | ||
| ) do |server| | ||
| Rails.application.config.after_initialize do | ||
| # FastMcp will automatically discover and register: | ||
| # - All classes that inherit from ApplicationTool (which uses ActionTool::Base) | ||
| # - All classes that inherit from ApplicationResource (which uses ActionResource::Base) | ||
| server.register_tools(*ApplicationTool.descendants) | ||
| server.register_resources(*ApplicationResource.descendants) | ||
| # alternatively, you can register tools and resources manually: | ||
| # server.register_tool(MyTool) | ||
| # server.register_resource(MyResource) | ||
| end | ||
| end | ||
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In the development environment, Rails lazy-loads classes, so
ApplicationTool.descendantsandApplicationResource.descendantswill likely be empty when this initializer runs. This will prevent your tools and resources from being registered. You should explicitly eager-load these directories to ensure all tool and resource classes are loaded before registration.