This server has 4 tools with clear verb-noun naming (browser_*), documented schemas, and descriptions. However, several issues prevent a higher score: (1) Descriptions are present but often lack WHEN/WHY context and operational implications (e.g., browser_click doesn't state it's a write operation affecting page state); (2) Parameter descriptions exist but are thin and lack actionable constraints (e.g., 'Timeout in milliseconds' without min/max bounds, 'CSS selector' without format hints); (3) Output schemas are NOT documented, critical because LLMs need to know what these tools return to plan downstream calls; (4) Error handling is generic (McpError wrapping) with no recovery guidance or retryability classification. The codebase shows reasonable tool structure (BaseTool abstract class, proper registry), but LLM-facing definition quality lags production baselines.

• Document output schema for each tool. E.g., browser_click should return {success: boolean, elementFound: boolean, errorMessage?: string, pageUrl: string} so LLMs know what to extract for downstream calls.
• Add min/max bounds to numeric parameters. E.g., timeout: number (min 100, max 60000), clickCount: number (min 1, max 10), limit: number (min 1, max 1000).
• Expand browser_close description to 50-150 chars explaining consequences: 'Terminates the browser session and closes all associated pages. Cleanup is automatic. Use this when done with a page to free resources. Note: cannot be reversed.'
• Add explicit 'Modifies page state' flag or note to browser_click description. State: 'This is a WRITE operation, it clicks elements, which may trigger JavaScript, navigation, or form submission. Ensure the element is ready before clicking.'
• Define the 'position' param structure in browser_click as a formal JSON Schema: {type: 'object', properties: {x: {type: number, description: 'Horizontal offset in pixels'}, y: {type: number, description: 'Vertical offset in pixels'}}}.
• Enhance error messages with retryability and recovery guidance. E.g., instead of 'Tool execution failed: Element not found', return: 'Element matching selector "#submit" not found. Available selectors: [#next-btn, .submit-btn]. Retry after waiting for page to load or use a different selector.'
• Add 'idempotentHint' or 'destructiveHint' annotations to tool metadata (per MCP spec tool-definitions). Mark browser_click as destructive, browser_annotate_page as read-only.