Single tool with valid schema and reasonable description, but several quality gaps. The tool name is correctly verb-prefixed ('generate_image'), input schema is present with proper types and enums, and the core description exists. However, the description contains mixed-language instructions (English + Chinese) directed at the LLM rather than documenting tool behavior, parameter descriptions are present but vary in quality, and no output schema is documented. The tool lacks error handling guidance, and the instruction to the LLM about adding HTML width attributes is an anti-pattern (tool descriptions should document behavior, not instruct the caller). Parameter documentation is adequate but the seed parameter's 'Optional' note in the description is redundant with not being in 'required'.

• Rewrite tool description to focus on what it returns: 'Generates an image using the SiliconFlow Flux Schnell model. Returns the generated image URL. Supports resolutions: 1024x1024, 960x1280, 768x1024, 720x1440, 720x1280. Optionally set a seed for reproducibility.'
• Document output schema explicitly: 'Returns: {imageUrl: string, resolution: string, prompt: string, timestamp: string, htmlTag?: string}' or similar.
• Remove LLM-instruction text from description. Move 'add width attribute' guidance to the agent's system prompt or post-processing, not the tool definition.
• Add error handling section to description: 'On failure returns error code and message. Invalid API key: set SILICONFLOW_API_KEY env var. Rate limited: wait and retry. Invalid resolution: must match enum.'
• Simplify description language to English only for clarity. If cultural flavor is desired, keep it in comments/logging, not tool definitions.
• Consider documenting approximate latency and cost implications (if applicable) so agents can reason about retry strategies.