This MCP server has critical definition quality issues. It provides only 3 tools, all with minimal schema depth and severely inadequate descriptions. Tool names lack clear action verbs, descriptions are generic boilerplate, and input/output schemas are either missing or incomplete. The server appears to be a thin k6 extension wrapper around MCP client operations rather than exposing actual domain-specific tools. Tool definitions are inferred from TypeScript declarations and code snippets rather than explicitly visible in Go registration. Most critically: (1) CallTool and NewClient have vague, non-actionable descriptions that don't explain WHEN or WHY an LLM should call them; (2) input schemas lack parameter constraints, enums, and proper descriptions; (3) output schemas are completely undocumented; (4) no error recovery guidance; (5) the tool set itself is architectural/meta-level (managing MCP client lifecycle) rather than domain-specific, making it unsuitable as a standalone MCP server for agent use.

• Add comprehensive descriptions (100-200 chars each) that explain WHAT each tool does, WHEN to use it, and WHAT it returns. Example: 'NewClient: Establish a stateless connection to an MCP server. Returns a session ID needed for subsequent tool calls. Call this once per agent task before invoking CallTool.'
• Document all input parameters with type, constraints, and examples. For CallTool 'args', specify: 'Arguments as a JSON object. Schema depends on the target tool, use describe() or the server docs to see required/optional fields.'
• Add output schemas to all tools. Example for CallTool: 'Returns an object with fields: {success: boolean, data?: any, error?: string}. Data structure depends on the called tool.'
• Add error handling guidance. Example: 'CallTool may fail with: ConnectionError (retry with backoff), InvalidToolName (check available tools with list_tools), ToolExecutionError (include error message in next LLM context).'
• Restructure the tool set: instead of exposing MCP client lifecycle, consider wrapping this as a transparent HTTP transport layer. A better design would be a single 'invoke_remote_mcp_tool' that encapsulates connection management, or don't expose these as MCP tools at all, use them internally in k6 module initialization.
• Add parameter enums/constraints. For NewClient 'isSSE', make it a boolean with explicit description: 'Use SSE (Server-Sent Events) transport for streaming responses. Default: false (use JSON-RPC over HTTP).'
• For headers parameter, clarify: 'Custom HTTP headers. Use for authorization (e.g. Authorization: Bearer <token>) or content negotiation. Do not include secrets in header values, use environment variables.'

Inferred effective spec: <=2025-11-25.

• Relies on Logging (deprecated) - log to stderr or use OpenTelemetry