The Crawl4AI MCP server has only one tool ('md') with minimal definition quality. The tool name lacks a clear action verb (should be 'crawl_url' or 'extract_markdown'), the description is vague (does not explain when to use vs alternatives, what the output structure is, or error handling), and the input schema is incomplete. The 'f' parameter is cryptic ('Output format (raw)') with no enum constraints or explanation of what 'raw' means or what other formats exist. No output schema is documented, the response structure is inferred from smoke tests but never formally specified. The server uses bearer token authentication (good security posture) but does not describe the permission model or what scope the tool requires. The single tool falls well below production baseline due to missing descriptions, incomplete parameters, and lack of output documentation.

• Rename tool from 'md' to 'crawl_url' or 'extract_markdown' to clearly signal the action. Test with LLM tool selection to confirm the verb helps disambiguation.
• Expand description to 100-150 characters: 'Fetch a URL using a headless browser and extract page content as markdown. Use this to read web pages, documentation, or articles. Returns cleaned markdown without ads or navigation. Supports http/https URLs. Timeouts at 30s.'
• Document output schema explicitly: { success: boolean, markdown: string, title?: string, url: string, error?: string }. Include field descriptions.
• Replace parameter 'f' with 'format' and add enum: ['raw', 'cleaned', 'structured']. Document each: 'raw = unprocessed HTML->MD; cleaned = remove nav/ads; structured = include heading hierarchy and links'.
• Add parameter description for 'url': 'HTTP or HTTPS URL (max 2048 chars). Must be publicly accessible. Returns error if URL is invalid, blocks requests, or times out after 30 seconds.'
• Document error cases with recovery guidance: 'If network_timeout, consider retrying with a shorter timeout. If blocked_by_cloudflare, no recovery possible, inform user. If 404, suggest searching for an updated URL.'
• Declare required permissions in tool metadata: 'read:network' or similar, so agents can be configured with least-privilege scope.
• Consider adding optional parameters: timeout_seconds (1-60, default 30), follow_redirects (boolean, default true), javascript_enabled (boolean, default true) to let agents tune behavior.