Critical gaps across naming, descriptions, and schemas. Most tools lack visible input schemas in source code, only 5 of 20 tools show explicit schema definitions (get_channel_info, list_channel_videos, get_captions, analyze_captions, get_channel_analytics). Descriptions are present but generic (avg ~80 chars, well below the 194-char baseline for A+ tools). Many tool names are ambiguous: 'analyze_thumbnail_effectiveness', 'analyze_video_performance', 'analyze_captions' conflate similar operations without clear distinction. No tool annotations (readOnlyHint/destructiveHint) despite 3 WRITE tools. Error handling is absent, api_client.py returns generic {'error': '...'} dicts with no recovery guidance. No pagination support visible despite tools like search_videos and list_channel_videos that could return large result sets.

• Add explicit input schemas to all 15 tools lacking them. Use JSON Schema with type, description, and enum/pattern constraints for every parameter. Reference the pattern at https://arcade.dev/patterns/tool.
• Rename 'analyze_*' tools to disambiguate: 'evaluate_thumbnail_quality', 'assess_video_metrics', 'extract_caption_insights'. Verify each name starts with a clear action verb and is distinct from similar tools.
• Add tool annotations to all WRITE tools: set destructiveHint=true for create_live_broadcast, send_live_chat_message, upload_video. Set readOnlyHint=true for all READ tools. This enables agents to reason about side effects.
• Enhance error responses with recovery guidance. Instead of {'error': 'Channel not found'}, return {'error': 'Channel not found', 'suggestion': 'Try search_by_topic() or lookup_channel() with a partial name'}. Reference https://arcade.dev/patterns/recovery-guide.
• Add pagination to list/search tools: include limit (default 20, max 50), offset/cursor, and total_count in responses. Document in tool descriptions. Reference https://arcade.dev/patterns/paginated-result.