Three tools with complete input schemas and descriptions. Naming follows verb_noun pattern (create_visual, list_visuals, get_visual_snippet). Descriptions are present and contextual (avg 150 chars), exceeding the 10-char minimum but below the 50-200 char LLM-optimized range. All parameters have type definitions and descriptions. However, output schemas are not documented, responses are inferred from code (JSON metadata, image list, snippet code). Error handling is minimal; no recovery guidance or categorization. No tool annotations (readOnlyHint/destructiveHint). Missing idempotency guarantees for create_visual (timestamp-based filename generation mitigates but not explicit). Composition is sound: three distinct concerns (generate, list, snippet). Parameter constraints use enums effectively (aspect_ratio, engine, snippet_type, style). No secrets exposed as parameters (API keys injected via Env). Baseline: 549 production tools average 18-char names (these are 13-15 chars, good); 94% of A+ tools have docstrings (this server has them); 100% of A+ tools document return types (this server does not).

• Document output schemas for all three tools. For create_visual, specify: {url: string, filename: string, engine: string, aspect_ratio: string, created_at: ISO8601, prompt_preview: string}. For list_visuals: {images: [{filename, url, size_kb, created_at, engine, prompt}], total: number}. For get_visual_snippet: {snippet: string, snippet_type: string, filename: string}.
• Add error recovery guidance. Wrap API calls in try-catch; categorize errors as retryable (rate limit, timeout) vs user-fixable (missing API key, invalid prompt) vs fatal (unsupported engine). Return: {error: string, category: 'retryable'|'user_fixable'|'fatal', suggestion: string}.
• Add tool annotations to tool definitions. create_visual: {destructiveHint: true}. list_visuals and get_visual_snippet: {readOnlyHint: true}. This signals to agents which tools have side effects.
• Expand list_visuals description to ~150 chars explaining discovery use case and result structure. Example: 'List all stored images with metadata (filename, URL, size, creation date, engine, prompt). Call this to discover available images before requesting snippets or regenerating.'
• Add validation constraints to create_visual parameters. For filename: 'Alphanumeric, hyphens, underscores only. Max 100 chars. Extension (.png) added automatically.' For prompt: 'Required. 1-2000 chars. English recommended for best quality.' For aspect_ratio: clarify that 16:9 is landscape, 9:16 is portrait.