cdp-browser provides 9 well-named, action-verb tools (navigate, click, fill, evaluate) with clear descriptions (avg ~80 chars). All tools have input schemas with type definitions. However, parameter descriptions are minimal or absent in several tools (press_key, wait_for lack detail on valid key names and timeout behavior). Output schemas are undocumented, LLMs cannot predict return structure. Error handling is absent: no guidance on what happens when selectors don't match, timeouts occur, or CDP disconnects. No pagination, no structured output beyond plain strings. Security: evaluate() runs arbitrary JavaScript, creating injection risk if agent input is unsanitized. Overall: solid naming and basic schemas, but lacks LLM-optimized descriptions, output documentation, and error recovery patterns.

• Document output schema for every tool. E.g., status() returns {connected: bool, tabs: [{url: string, title: string}]}. navigate() returns {url: string, title: string}. This enables LLM planning and eliminates parsing ambiguity.
• Add parameter constraints to press_key description: 'Valid keys: Enter, Escape, ArrowUp, ArrowDown, Tab, Backspace, etc. See Playwright keyboard API.' Enumerating common keys prevents hallucinated key names.
• Wrap selector-based tools (click, fill, get_text, extract_all, wait_for) with error handling: return {success: bool, message: string, suggestion?: string}. E.g., 'Selector "button.submit" not found. Try: button[type=submit], .submit-btn, or use evaluate() to inspect the page.'
• Add timeout and retry guidance to navigate(), click(), fill(), wait_for() descriptions. E.g., 'Timeout: 10s. If selector not found, use wait_for() first or call evaluate() to inspect page structure.'
• Sanitize evaluate() input: validate that expressions don't contain dangerous patterns (fetch, XMLHttpRequest, localStorage access). Return {result: any, type: string} with explicit type declaration to guide LLM parsing.