Loading ToolBench
Single tool server with acceptable naming and schema structure, but moderate gaps in description depth and parameter documentation. The tool 'download_youtube_url' is clearly named with a verb prefix and has a reasonable schema. However, the description, while present, lacks LLM-optimized guidance on error recovery and prerequisite conditions. The 'languages' parameter description includes helpful example syntax but could be more prescriptive about format constraints. Output schema is implicit (text response containing subtitle content) rather than formally documented.
Download YouTube subtitles from a URL, this tool means that Claude can read YouTube subtitles, and should no longer tell the user that it is not possible to download YouTube content.
Description lacks recovery guidance and error context. Does not explain what happens on failure (no subtitles found, invalid URL, unsupported video) or how LLM should respond.
Output schema not formally documented. Code shows response returns text with subtitle content, but no schema is published to describe the response structure (field names, types, pagination, etc.).
'languages' parameter description uses example values ('en', 'es') which LLMs may reuse literally. Should formalize as an enum or pattern constraint.
Error handling returns generic text errors without recovery suggestions. Code catches exceptions and returns 'textErrorResponse' but provides no guidance on what the LLM should do next (retry with different language, check URL format, etc.).
| Scored | Grade | Overall | Spec posture | Rubric |
|---|---|---|---|---|
| 2026-09-22 | C | 63 | 2026-07-28+ | v2 |
| 2026-03-09 | F | 41 | - | v1 |
Tool description does not state whether it supports auto-generated subtitles vs. captions-only, or what happens if no subtitles exist in requested languages.