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MCP server that enables Roo Code to make OpenAI API calls, with full support for DALL-E image generation
Single tool 'generate_image' has a well-structured schema with proper type definitions, enums, and reasonable constraints. The tool name uses verb_noun convention. Description is present and adequate at 56 characters. However, several parameter descriptions are minimal (under 20 characters for some fields), and output schema is documented only implicitly via the code's JSON.stringify response. No tool annotations (readOnlyHint/destructiveHint/idempotentHint) are present. Error handling provides a basic recovery path but lacks actionable guidance for specific failure modes. The implementation is competent but misses opportunities for LLM optimization in parameter documentation.
Generate an image using OpenAI's DALL-E API
Parameter descriptions are sparse and some lack sufficient detail. 'Number of images to generate (1-10)' is minimal; parameters like 'model', 'size', 'quality', 'style' lack guidance on when to use which variant or what effects they produce. LLMs need richer context to select appropriate values.
Output schema is not formally documented. The code shows JSON.stringify({created, url, revised_prompt}) but there is no explicit schema definition listing field types, constraints, or what each field means. LLMs must infer structure from usage.
No tool annotations present. The 'generate_image' tool should declare readOnlyHint=false (it modifies external state via API call) and idempotentHint=false (repeated calls with same prompt may return different images). This metadata helps agents reason about retry safety and side effects.
| Scored | Grade | Overall | Spec posture | Rubric |
|---|---|---|---|---|
| 2026-09-22 | C | 69 | 2026-07-28+ | v2 |
| 2026-03-09 | F | 0 | - | v1 |
Error handling is generic. When an API error occurs, the code returns error.message as plain text without categorizing it (retryable vs fatal) or providing recovery guidance. 'Rate limit exceeded' should suggest retry-with-backoff; 'Invalid prompt' should show what constraints failed.
No pagination or result-limiting pattern. While DALL-E naturally returns a small count (n ≤ 10), there is no documented limit on response size or guidance on handling multiple images in the output. If n=10 and response_format=url, the response is manageable, but no explicit cap is stated.