Geisterhand exposes 7 tools with basic schemas and descriptions, but falls short of production quality. Tool names lack action verbs (screenshot, click, type, key, scroll, status, check, only 'click', 'type', 'key', 'scroll' start with verbs; 'screenshot', 'status', 'check' are nouns). Descriptions are present but minimal (10-50 chars), below the 50-200 char LLM-optimized baseline. Parameter descriptions exist but are sparse and lack constraints (e.g., 'button' accepts 'left, right, center' but no enum; 'key' accepts arbitrary strings with no validation guidance). Output schemas are not documented, LLMs cannot predict what these tools return. Error handling is absent; no recovery guidance. Security concern: 'pid' parameter exposes process targeting without permission checks. Overall, definitions are skeletal, suitable for CLI but not for agentic use.

• Rename tools with action verbs: 'screenshot' → 'capture_screenshot', 'status' → 'query_status', 'check' → 'verify_accessibility'. Verb-noun pairs improve LLM intent inference.
• Expand descriptions to 50-200 chars. Example: 'Capture a screenshot of the target window or entire screen. Returns base64-encoded PNG/JPEG. Use before clicking to verify UI state.' Include WHAT, WHEN, and WHAT it returns.
• Formalize parameter constraints as enums in schema. Change 'button' from free text to enum: ['left', 'right', 'center']. Change 'format' to enum: ['png', 'jpeg']. Add 'key' validation enum or regex pattern.
• Document output schemas for all tools. Example for 'capture_screenshot': {type: 'object', properties: {data: {type: 'string', description: 'Base64-encoded image'}, width: {type: 'integer'}, height: {type: 'integer'}, format: {type: 'string'}}}.
• Add error handling with recovery guidance. Example: 'PID not found. Available PIDs: [list]. Try check() first to verify accessibility support.' Categorize errors as retryable vs user-fixable.