ShiLiu MCP demonstrates moderate quality with consistently documented tool descriptions and proper parameter schemas, but lacks critical metadata in error handling, lacks tool annotation hints, and has minimal composition guidance. All 10 tools are explicitly registered with @mcp.tool decorators and have non-empty descriptions (average ~150 chars). Parameters include type information and descriptions. However, error handling is generic ('Exception as e' → bare error message), no tool annotations (readOnlyHint, destructiveHint, idempotentHint) are present, and responses do not include explicit field documentation. The server targets a specialized domain (AI video generation) and handles the use case adequately, but lacks production-grade error recovery patterns and output schema documentation. Average per-tool score: 58/100.

• Add tool annotations: mark create_* tools with destructiveHint=true and idempotentHint=false if they are not idempotent; mark get_* tools with readOnlyHint=true. Use FastMCP's @mcp.tool(..., hints={...}) or equivalent.
• Enhance error handling: categorize exceptions as retryable (network, timeout) vs user-fixable (invalid parameter) vs fatal (auth failure). Return structured error responses with actionable guidance, e.g., 'Invalid image_url: must be HTTPS and publicly accessible. Retry with a valid URL.' instead of bare exception text.
• Document output schemas: explicitly list fields returned by each MCPResponse type (e.g., MCPAvatarCreateResponse returns {code: int, msg: str, data: {avatar_id: int, ...}}). Add to tool description or return example.
• Add pagination to list tools: introduce limit (default 20, max 100) and offset/cursor parameters to get_avatar_list and get_speaker_list. Return total count or next_cursor so agents can fetch large datasets without exploding context.
• Add dry-run mode to creation tools: support an optional dry_run=true parameter on create_avatar_by_image, create_avatar_by_video, create_speaker, create_video_by_text. When dry_run=true, validate inputs and return estimated result without actually submitting to ShiLiu API.
• Improve parameter descriptions: expand optional 'title' fields to explain format constraints, e.g., 'Optional title (1-100 chars, no special characters). If omitted, a default name is generated.' Similarly, document what happens if image_url or video_url are invalid.