Single tool 'generate_image' with adequate schema but significant gaps in parameter descriptions and error handling guidance. Description is present (262 chars, within baseline range) but lacks actionable error recovery patterns. Parameter descriptions exist but lack explicit format constraints (e.g., no mention of valid size formats beyond default). No output schema documented. Tool is functional but would not pass production code review, lacks error classification, recovery guidance, and output structure documentation required for reliable agent integration.

• Add explicit output schema documentation: specify that the tool returns {prompt: string, model: string, size: string, url: string} with field descriptions and types.
• Enumerate valid size formats. Change parameter description from 'Image size specification' to 'Image dimensions as WIDTHxHEIGHT in pixels. Valid options: 1024x1024, 512x512, 256x256, 1024x1792, 1792x1024' (or use JSON Schema enum constraint).
• Clarify 'model' parameter behavior: either provide enum of available models, explain how to discover them, or document what happens when an empty string is passed. Remove ambiguity around default behavior.
• Add error handling guidance: 'If generation fails (e.g., content policy violation, service unavailable), the tool returns an error with reason. Retryable errors (timeout, rate limit) indicate the agent should retry with exponential backoff. Non-retryable errors (invalid prompt, unsupported model) should be reported to the user.'
• Remove presentation logic from tool description. Separate tool semantics ('generates and returns image URL') from client rendering ('present as clickable link'). Leave rendering to the client.
• Add parameter constraints to JSON Schema: 'model' as enum or with pattern; 'size' with regex or enum; 'prompt' with minLength/maxLength boundaries.