Server has 8 tools with basic descriptions but significant quality gaps. Most tools have empty input schemas ({}), violating the requirement that every parameter needs a description. Tool descriptions are present but generic (avg ~80 chars, below the 194-char baseline). No output schemas documented. Error handling is minimal, tools return raw JSON or error strings without recovery guidance. No tool annotations (readOnlyHint/destructiveHint). The adb_connect tool accepts parameters but lacks descriptions for pair_code, pair_port, connect_port. get_location has parameters with descriptions, but others do not. No evidence of idempotency, permission gates, or audit trails.

• Add explicit input schemas to all tools. For no-parameter tools (get_battery_status, get_wifi_info, etc.), use 'properties: {}' with a clear description. For get_location, formalize provider and request as enums: provider: enum['gps', 'network', 'passive'], request: enum['once', 'last', 'updates'].
• Document output schemas for each tool. E.g., get_battery_status returns {level: number, status: string, temperature: number, ...}. This enables LLMs to extract fields for downstream calls.
• Add parameter descriptions to adb_connect: pair_code='Pairing code from Settings → Developer Options → Wireless Debugging (6 digits)', pair_port='Pairing port (e.g., 37123)', connect_port='Connection port (e.g., 5555 or 45678)'.
• Enhance error messages with recovery guidance. Instead of 'Error: adb not found', return 'ADB not found. Run: pkg install android-tools. Then call adb_setup_status to verify connection.' Categorize errors as retryable (timeout) vs user-fixable (missing package) vs fatal.
• Add tool annotations: mark all read-only tools with readOnlyHint=true; mark adb_connect with destructiveHint=true (modifies device state). This enables agents to reason about side effects and retry safety per current MCP spec.