This server has critical definition failures. The single tool 'execute_skill_action' has no visible input schema, no parameter descriptions, and a generic 1-line description (28 chars). The mcp_server.py file contains only a stub that prints JSON and exits, it does not implement the MCP protocol at all. No tool registration, no request/response handling, no schema validation. The code is non-functional as an MCP server.

• Define explicit input schema for execute_skill_action with typed parameters (e.g., skill_name: string, action: string, parameters: object) and descriptions for each.
• Expand tool description to 50 - 200 characters explaining: what the tool does, when to call it, what it returns, and any prerequisites (e.g., 'Executes a registered skill action via the plugin harness. Use this to invoke custom agent plugins. Returns execution_result with status and output.').
• Document output schema with all returned fields (execution_result, status, output, error) and their types.
• Implement the MCP protocol request/response loop in mcp_server.py: parse JSON-RPC calls, invoke tools, return structured responses.
• Add error handling that returns actionable messages (e.g., 'Skill not found. Available skills: [list]. Try a different skill name.') instead of raw errors.