Desktop Pet exposes 11 tools with complete input schemas and descriptions in Chinese. Naming follows verb_noun convention (open_url, web_search, list_installed_apps). Descriptions are detailed and contextual (avg ~180 chars), explaining WHEN to use each tool and warning about side effects. However, output schemas are entirely undocumented, no structured response format is specified for any tool. Error handling is minimal; handlers throw generic errors without recovery guidance. Parameters lack type constraints (e.g., 'limit' has no min/max bounds). The server is STDIO-only, capping protocol readiness at 50. Tool composition is reasonable (each does one thing), but missing pagination support for list_installed_apps and no idempotency guarantees.

• Document output schemas for all tools. E.g., list_installed_apps should return {apps: [{name: string, path: string}], total: number}. get_current_time should return {iso: string, unix: number, timezone: string, day_of_week: string}.
• Add bounds to numeric parameters: limit (1 - 1000), and document defaults. E.g., 'limit: max 1000 results per call, default 50'.
• Enhance error messages with recovery guidance. E.g., 'URL must include scheme (http://, https://, file://, etc). Got: "example.com". Did you mean: https://example.com?'
• Implement pagination for list_installed_apps: add offset/cursor and return total_count so agents can iterate safely.
• Add confirmation/dry-run support for mutating tools (open_app, set_clipboard, open_path) to prevent accidental side effects on retry.