Server has 17 tools with basic naming (verb_noun pattern mostly followed) and descriptions present, but quality is inconsistent. Most tool descriptions are adequate (50-150 chars), but parameter descriptions are sparse or missing entirely. Input schemas are visible in the code but lack proper JSON Schema structure with type constraints, enums, and validation rules. No output schemas documented. Error handling is minimal, most tools return raw API responses without recovery guidance. Security concern: OAuth tokens stored in plaintext JSON file. Composition is reasonable (single-responsibility tools), but several tools lack idempotency guarantees and confirmation steps for destructive operations.

• Add JSON Schema output definitions for all tools. Document the structure of device objects, scene objects, rule objects, and routine responses. Include field types, required fields, and examples.
• For set_brightness, set_color, set_temperature, set_thermostat: add min/max constraints and enum values in schema. E.g., brightness: {type: integer, minimum: 0, maximum: 100}; thermostat mode: {type: string, enum: [heat, cool, auto, off]}.
• Encrypt OAuth tokens at rest using a key derived from SMARTTHINGS_CLIENT_SECRET or a dedicated encryption key. Rotate tokens securely and never log them.
• Add pagination to list_devices, list_scenes, list_rules with limit (default 20, max 100) and offset/cursor parameters. Return total_count and next_cursor in responses.
• Wrap delete_routine in a confirmation pattern: add a dry_run parameter or require a confirmation_token returned by a separate confirm_delete_routine tool. Document that deletion is irreversible.

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

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