This multiplexer server exposes 6 tools that proxy calls to downstream MCP servers. While tool names follow verb_noun convention (list_*, get_*, read_*, call_*), descriptions are minimal (10-50 chars, well below the 194-char baseline). Critical gaps: no input parameter descriptions (e.g., 'arguments' param in handle_get_prompt lacks guidance on expected structure), no output schemas documented, no error handling guidance, and no validation rules. The handle_call_tool tool accepts arbitrary 'arguments' as an untyped object with no constraints or examples. Tool definitions are visible in source but lack the depth needed for reliable LLM selection and parameter binding.

• Expand all tool descriptions to 100 - 200 characters. Include WHAT the tool does, WHEN to call it, and WHAT it returns. Example: 'Lists all available tools from connected downstream MCP servers. Call this first to discover what tools are available before invoking handle_call_tool. Returns an array of tool objects with name, description, and input schema.'
• Add descriptions to all parameters. For 'arguments' in handle_get_prompt and handle_call_tool, specify: 'A JSON object containing tool-specific arguments. Structure depends on the target tool's input schema. Pass an empty object {} if no arguments are needed.'
• Document output schemas for each tool. For handle_list_tools, specify: 'Returns an array of Tool objects, each with: name (string), description (string), inputSchema (JSON Schema object).'
• Add error handling with recovery guidance. Wrap downstream calls in try-catch and return structured errors: '{"error": "Server unreachable", "server": "searxng", "suggestion": "Check ENABLED_SERVERS config and server availability."}'
• Add validation for handle_call_tool: validate that 'name' matches a known tool from handle_list_tools before forwarding. Return a clear error if the tool is not found: 'Tool "unknown_tool" not found. Available tools: [list]. Call handle_list_tools() to see all options.'