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Single-tool server with basic schema and description present. Tool naming follows verb_noun convention ('generate_image'). Description is present but generic (38 chars) and lacks critical context about what happens when called, prerequisites, and expected output format. Input schema is explicit and correctly typed. However, tool lacks output schema documentation, error handling guidance, and parameter validation details. No mention of async behavior, latency expectations, or API limitations. Per the rubric baseline of 194 chars average description length and 100% A+ tools having param descriptions, this server falls short on both, description is 38 chars (below p10=34 but barely adequate) and lacks output schema entirely.
Generate an image using the Flux Schnell model
Missing output schema documentation. Tool returns structured JSON but no schema is documented for downstream tool composition or result parsing.
Generic, overly brief description (38 chars). Does not explain WHEN to use tool, what output format to expect, or API behavior (async vs sync, latency, costs).
Prompt parameter description lacks constraints. Should specify: max length, allowed characters, whether system prompts are filtered, and examples of well-formed prompts.
Error handling is minimal and non-actionable. Code catches Axios errors but returns raw API error detail; LLM has no recovery guidance (e.g., 'Quota exceeded, try again in 60s' or 'Invalid prompt, check for unsupported characters').
| Scored | Grade | Overall | Spec posture | Rubric |
|---|---|---|---|---|
| 2026-09-22 | F | 49 | 2026-07-28+ | v2 |
| 2026-03-09 | D | 52 | - | v1 |
No mention of idempotency or side effects. Tool makes a write (generates image via Replicate), but description does not clarify whether repeated calls with same prompt return cached result or incur duplicate charges.
No documentation of async behavior. Replicate API is async (polls for status), but tool returns immediate response without explanation of polling semantics or expected delays.
REPLICATE_API_TOKEN credential stored in process.env and passed to Axios headers. While this avoids leaking in tool parameters, the server should validate token presence with clear error message to guide setup.