This is a Ruby MCP CLIENT library, not an MCP server. The evaluation reveals a fundamental mismatch: the repo (ruby-mcp-client) is a client-side SDK for consuming MCP servers, not a server that exposes tools to LLMs. The source code shows transport abstraction (HTTP, SSE, STDIO), tool calling infrastructure, and protocol handling, all CLIENT-side patterns. The four example tools (echo, reverse, uppercase, count_words) are minimal demos in examples/echo_server.py (a Python file, not Ruby), likely used for testing the client library. No production tools are defined in the Ruby codebase itself. The tool definitions provided appear to be reverse-engineered from examples or documentation rather than directly visible in the Ruby source. Per HARD SCORING RULE: 'If you cannot see the actual tool definition in the source (only inferred): cap that tool's overall at 50.' Since all four tools are inferred from external examples and lack evidence of explicit Ruby registration, each tool caps at 50. The library itself demonstrates sophisticated protocol handling (CalledToolDefinition tracking, HeaderMismatch retry with tool definition pinning per MCP 2026-07-28, HTTP transport with tool listing and Mcp-Param headers), but these are client-side capabilities, not server-side tool quality. Definition quality score reflects that the tools are not actually defined or registered in this codebase.

• Clarify: Is this repo meant to be an MCP server or a client library? Based on source code (lib/mcp_client), it is a CLIENT. If evaluating as a server, provide actual Ruby server code with tool definitions.
• If examples/echo_server.py is meant to demonstrate the client, move those tool definitions into a Ruby implementation or mark them as Python reference only.
• Expand tool descriptions to 50-200 characters, following pattern:tool-description. Example: 'Echo back the provided message, preserving whitespace and special characters. Useful for testing communication integrity. Accepts UTF-8 strings up to 100,000 chars.'
• Rename tools to action-verb style: 'echo_text', 'reverse_text', 'convert_text_to_uppercase', 'count_words_in_text' to match Arcade baseline (verb_noun convention).
• Add output schema documentation for each tool. Example for 'echo_text': {"type": "object", "properties": {"echoed_message": {"type": "string", "description": "The exact input message returned"}}, "required": ["echoed_message"]}
• Document parameter constraints in descriptions. Example: '(max 100,000 UTF-8 characters; newlines preserved; special characters allowed)'.
• Add error handling guidance. Example: 'Returns error if message exceeds 100,000 chars. Suggest splitting input and retrying with chunks.'
• Add idempotent hints. For read-only tools, add x-mcp-idempotentHint: true to indicate safe to retry.
• If this is a client library intended for testing MCP servers, update repo description to clarify. Move examples to 'examples/' subdir with clear labels ('Reference implementation for testing').

Inferred effective spec: 2025-06-18+.

• Relies on Sampling (deprecated) - integrate directly with the LLM provider API