{"id":"rubyonai-mcp-on-ruby","name":"mcp_on_ruby","homepage":null,"repo_url":"https://github.com/rubyonai/mcp_on_ruby","category":"ai-ml","subcategories":[],"tags":["mcp","ruby","rails","json-schema","json-rpc","ai-integration","tooling","resources","security"],"what_it_does":"Provides a Ruby/Rails integration that exposes a Rails app as a Model Context Protocol (MCP) server, letting you publish application tools (callable functions with JSON Schema input validation) and resources (URI-templated data exposure) over an HTTP/JSON-RPC style transport, with configurable authentication, rate limiting, and security protections.","use_cases":["Expose Rails business logic as MCP tools for AI agents","Expose Rails data as MCP resources using URI templates","Create an MCP server inside an existing Rails app","Add JSON Schema validation for tool inputs","Protect MCP endpoints with token authentication and origin controls"],"not_for":["A standalone MCP server not integrated with Rails","Use-cases requiring an official hosted SaaS pricing model","Environments needing GraphQL/gRPC interfaces (not indicated)"],"best_when":"You have a Rails application and want to make selected server-side operations/data accessible to MCP-compatible AI clients with built-in validation and access controls.","avoid_when":"You need a fully documented, spec-complete MCP transport plus mature real-time (SSE) support; the README suggests SSE is foundational but not fully implemented.","alternatives":["Build an MCP server directly in a general-purpose Node/Python service (instead of Rails)","Use an existing MCP server framework for Ruby/Python/Node with first-class transport tooling","Expose functionality via your own REST/GraphQL API and use an adapter layer for MCP"],"af_score":67.0,"security_score":62.8,"reliability_score":32.5,"package_type":"mcp_server","discovery_source":["github"],"priority":"high","status":"evaluated","version_evaluated":null,"last_evaluated":"2026-03-30T13:47:17.801054+00:00","interface":{"has_rest_api":false,"has_graphql":false,"has_grpc":false,"has_mcp_server":true,"mcp_server_url":"http://localhost:3000/mcp","has_sdk":false,"sdk_languages":[],"openapi_spec_url":null,"webhooks":false},"auth":{"methods":["Token authentication (MCP_AUTH_TOKEN)","Per-tool/resource authorize(context) hooks (custom authorization logic)"],"oauth":false,"scopes":false,"notes":"Authentication appears to be token-based with configurable enablement; authorization is also implemented via tool/resource authorize(context) methods. No evidence of OAuth, fine-grained scopes, or multi-tenant claims in the provided content."},"pricing":{"model":null,"free_tier_exists":false,"free_tier_limits":null,"paid_tiers":[],"requires_credit_card":false,"estimated_workload_costs":null,"notes":"MIT-licensed Ruby gem; no pricing information for a hosted service."},"requirements":{"requires_signup":false,"requires_credit_card":false,"domain_verification":false,"data_residency":[],"compliance":[],"min_contract":null},"agent_readiness":{"af_score":67.0,"security_score":62.8,"reliability_score":32.5,"mcp_server_quality":65.0,"documentation_accuracy":70.0,"error_message_quality":0.0,"error_message_notes":null,"auth_complexity":75.0,"rate_limit_clarity":65.0,"tls_enforcement":80.0,"auth_strength":70.0,"scope_granularity":35.0,"dependency_hygiene":55.0,"secret_handling":70.0,"security_notes":"README claims security features including DNS rebinding protection, CORS controls, and token authentication. It also shows using ENV['MCP_AUTH_TOKEN'] for the auth token. No concrete details are provided on TLS enforcement guarantees, secure headers, token storage rotation, or dependency vulnerability status.","uptime_documented":0.0,"version_stability":45.0,"breaking_changes_history":40.0,"error_recovery":45.0,"idempotency_support":"false","idempotency_notes":"No explicit idempotency guarantees for tool execution are described in the README content.","pagination_style":"none","retry_guidance_documented":false,"known_agent_gotchas":["SSE/real-time is described as 'foundation (full implementation coming soon)', so agents should not rely on complete SSE behavior.","Tool/resource behavior depends on developer-provided authorize(context) logic; incorrect authorization can cause either overexposure or denial of service to the agent."]}}