Critical failures across naming, descriptions, and schemas. 23 tools declared but massive duplication (get_lights appears 4 times, control_light 2 times, get_sensors 2 times, get_climate 2 times). Most tools lack parameter descriptions entirely. Schemas present but minimal, many parameters undescribed. No output schemas documented. Tool descriptions are generic and under 50 chars on average. No error handling guidance. Security risk: call_service exposes domain/service/entity_id as free-form strings with no validation or enum constraints.

• Deduplicate tools immediately. Keep ONE get_lights, ONE control_light, ONE get_sensors, ONE get_climate. Remove all duplicates from ha-mcp-server.js and other files.
• Add enum constraints to call_service: domain must be one of [light, switch, climate, sensor, automation, ...]; service must be one of [turn_on, turn_off, toggle, set_temperature, ...]. Validate against Home Assistant's actual service registry.
• Document output schemas for every tool. E.g., get_lights returns [{entity_id: string, state: 'on'|'off', brightness: 0-255, color: string}]. Include this in tool description or as a separate schema field.
• Add min/max constraints to numeric parameters. E.g., control_light brightness: 0-255 (required in description and schema). control_climate temperature: 15-30 (or domain-specific range).
• Remove test tools (test_simple, test_connection, get_temperature_simple) from production. If needed for debugging, gate them behind a debug flag or separate endpoint.