KC IoT Gateway has 6 tools with basic definitions but significant quality gaps. All tools have descriptions (bilingual English/Chinese), but descriptions are generic and lack actionable context. Input schemas are present but minimal, most parameters lack type constraints, enums, or validation guidance. No output schemas documented. Error handling is present but returns raw JSON errors without recovery guidance. Tool names follow verb_noun convention (list_*, read_*, write_*) but lack specificity about what data is returned or when to use each tool. The write_device tool accepts a JSON string parameter, which is error-prone and lacks format validation. No tool annotations (readOnlyHint, destructiveHint, idempotentHint) despite clear risk levels. Composition is reasonable (6 focused tools), but parameter descriptions do not explain dependencies or constraints.

• Replace write_device's 'params' string parameter with a structured object. Define a schema with known device control fields (e.g., motor_speed: integer, valve_state: enum). Validate against schema before execution.
• Document output schemas for all tools. Example: list_devices returns [{device_id, name, protocol, status, last_update}]. This enables LLMs to chain calls and extract required fields.
• Enhance descriptions with context: 'List all connected IoT devices. Call this first to discover available devices before reading/writing. Returns device_id, protocol, and online status.' Add 'When to use' and 'Returns' sections.
• Add enum constraints to parameters. list_alerts 'severity' should be enum: [critical, warning, info]. read_device 'field' should document valid field names or provide a discovery tool.
• Add tool annotations: mark write_device with destructiveHint=true, mark read_device and list_* with readOnlyHint=true. This guides agent planning and safety checks.