Phone Farm exposes 11 tools with basic descriptions but significant quality gaps. Most tools lack parameter descriptions (type_text, tap, scroll, launch_app have minimal or missing param docs). Output schemas are undocumented, tools return strings or unstructured text rather than typed objects. Error handling is absent; tools fail silently or return generic error strings. No input validation, no recovery guidance, no pagination support. Naming is reasonable (verb-noun pattern: boot, teardown, tap, screenshot) but descriptions are terse (10-50 chars for most tools, well below the 194-char baseline). The server is functional for basic automation but falls short of production-grade tool design.

• Add output schemas to all tools. Document return types as JSON objects with typed fields. E.g., crashes() should return {crashes: [{type: string, timestamp: string, message: string}], total: number}.
• Expand tool descriptions to 100-200 chars. Include WHAT the tool does, WHEN to use it, and WHAT it returns. E.g., 'Tap an element on the screen by text, resource ID, or coordinates. Use after screen() to identify targets. Returns success/failure status.'
• Add parameter descriptions and constraints. For tap(), clarify: 'Provide exactly one of: text (element label), resource_id (com.app:id/button), or xy (coordinates as "x,y"). Mutually exclusive.'
• Implement structured error responses. Return {error: string, code: string, recovery: string} instead of plain text. E.g., 'No emulator running. Call boot(apk_path) first to start the emulator.'
• Add enums for constrained parameters. scroll(direction: enum[up|down|left|right]), launch_app(package: string with format validation). Validate inputs and return clear error messages on invalid values.