Single tool with critical definition gaps. Tool name 'plan_browser_actions' lacks action verb clarity (should be 'generate_browser_action_plan' or similar). Input schema visible but parameters lack descriptions entirely, 'goal' and 'elements' have no guidance on format, constraints, or usage. Output schema completely undocumented; LLM cannot predict response structure. Description is 97 chars (within range) but generic. No error handling, no validation guidance, no recovery paths. Tool definition inferred from code rather than explicit registration with full schema.

• Add parameter descriptions: 'goal' should explain natural language format and examples (e.g., 'Natural language description of the user intent, e.g., "Add product to cart and checkout"'). 'elements' should document the DOM element structure: 'Array of DOM elements, each with tag (string), id/class (optional string), attributes (object), and text (string). If omitted, defaults to example e-commerce elements.'
• Document the output schema in the tool description or as a separate schema field. Include: action_sequence (array of action objects with step, action_type, selector, fallback_xpath, description), total_actions (integer), estimated_completion_sec (float), resilience_grade (string).
• Add input validation and error handling. Return structured errors: 'Invalid goal: must be non-empty string' or 'Invalid element structure: missing required field "tag"'. Guide recovery: 'If elements are incomplete, provide tag, id/class, and text content for each DOM node.'
• Rename tool to 'generate_browser_action_plan' to start with a clear action verb and improve LLM intent recognition.
• Add parameter constraints: goal (required, 10-500 chars), elements (optional, max 50 items). Document action_type enum: TYPE, CLICK, NAVIGATE_OR_CLICK. Specify selector format (CSS) and fallback_xpath format (XPath).