Single tool 'executeTool' acts as a generic proxy/dispatcher rather than exposing discrete, well-defined operations. The tool name violates verb_noun convention (should be 'execute_page_tool' or similar). Description is vague about what each action does and when to use them. Input schema lacks proper typing for the 'action' parameter (free-form string instead of enum), making it impossible for LLMs to know valid actions without trial-and-error. No output schema documented. Parameters lack descriptions for what each action expects/returns. The design conflates multiple concerns (tab management, tool discovery, tool execution) into one tool, violating single-responsibility principle.

• Split executeTool into 4 discrete tools: list_tabs (returns available tabs and their exposed tools), open_tab (params: url; returns: tab_id), close_tab (params: tab_id), execute_page_tool (params: tab_id, tool_name, tool_args; returns: result). Each tool has one clear responsibility.
• For execute_page_tool, require tool_name as an enum or require calling list_tabs first to discover available tools. Document that tool_args is a JSON object matching the page tool's schema.
• Add output schemas for each tool. E.g., list_tabs returns {tabs: [{id, url, available_tools: [{name, description, inputSchema}]}]}. open_tab returns {tab_id, url}. execute_page_tool returns {success, result, error}.
• Add per-parameter descriptions. E.g., 'url (string): Full URL to open in new tab, e.g. https://example.com. Must be valid HTTP/HTTPS URL.' 'tab_id (number): Numeric tab identifier returned by list_tabs.'
• Document error cases and recovery. E.g., 'If tab_id is invalid, call list_tabs() to get current tab IDs.' 'If page tool is not found, call list_tabs() to see available tools for that tab.'