Loading ToolBench
This server implements 2 file upload tools with explicit Zod schemas and basic descriptions. However, it has critical gaps in parameter descriptions, lacks output schema documentation, provides minimal error guidance, and omits important metadata like constraints and format requirements. The naming is reasonable (verb-based), but descriptions are too brief (10-35 chars, below the 50-200 char production baseline). Parameter descriptions exist but are minimal and lack constraint details (e.g., no mention of file size limits, allowed formats, or what 'English' means for filenames). Error handling returns unstructured text without recovery guidance. No tool annotations or advanced patterns are present.
upload file from a url or local file path
convert SVG content to PNG image format and upload to server
Parameter descriptions are too brief and lack constraints. 'The file name (must be in English)' does not explain what 'English' means, file size limits, or allowed characters. LLMs cannot infer these constraints.
Tool descriptions are below the 50-200 character production baseline (10-35 chars). 'upload file from a url or local file path' and 'convert SVG content to PNG image format and upload to server' lack context about when to use each tool vs the other, prerequisites, or what is returned.
No documented output schema. Functions return hardcoded response objects with 'content' and 'text' fields, but the structure is not formally documented. LLMs cannot plan downstream tool calls without knowing what fields to expect.
| Scored | Grade | Overall | Spec posture | Rubric |
|---|---|---|---|---|
| 2026-09-22 | F | 42 | 2026-07-28+ | v2 |
| 2026-03-09 | F | 30 | - | v1 |
Error responses lack recovery guidance. createErrorResponse() returns bare error text (e.g., 'Missing required environment variables'). Error messages do not tell the LLM what to do next or classify the error as retryable, user-fixable, or fatal.
No parameter constraints (min/max, regex, enum). The 'source' parameter accepts any string; there is no validation that it is a valid URL or file path until runtime. Width and height have no min/max bounds, LLMs could pass negative or absurdly large values.
Environment variables (UPLOAD_URL, FILE_KEY, FILE_NAME) are validated at runtime but not documented in tool descriptions. LLMs and users have no way to know these are required or what they control.
No idempotency guarantee. If an upload succeeds but the confirmation is lost, retrying will upload the same file twice, creating duplicates. No mention of whether reuploading the same file overwrites or creates a new record.
The 'fileName' parameter description says '(must be in English)' but does not explain: what happens if non-ASCII characters are used? Are spaces allowed? What extensions are valid? Are paths allowed? This forces LLMs to guess or fail at runtime.