Loading ToolBench
Single tool with adequate naming and schema, but descriptions lack depth and parameter guidance is minimal. The tool name 'check_time' is clear and verb-prefixed, following naming conventions. Input schema is present with proper JSON Schema structure (type: object, properties defined). However, the timezone parameter description is verbose but lacks actionable constraints (no mention of validation, error handling for invalid IANA identifiers, or what happens on malformed input). No output schema is documented, LLMs cannot predict the response structure (utc, local_time, date, timezone, full_timezone fields are invisible in the tool definition). Tool description (97 chars) is adequate but could better explain when to use this tool vs alternatives, and lacks mention of the external Worker dependency or potential failure modes.
Get current time in UTC and local timezone format. Returns formatted time, date, and timezone information.
Output schema not documented. LLMs cannot predict response structure (utc, local_time, date, timezone, full_timezone fields are undocumented). This violates pattern:tool and forces LLMs to guess field names for downstream processing.
Timezone parameter lacks validation guidance. Description does not specify what happens if an invalid IANA identifier is passed (e.g., 'InvalidZone'), whether the tool returns an error, falls back to UTC, or fails silently. No constraint on format or examples of valid values beyond two examples.
External Worker dependency not documented in tool description. The tool relies on TIME_WORKER_URL environment variable and makes HTTP calls to a Cloudflare Worker. If the Worker is unreachable or misconfigured, the tool fails with a generic error. No recovery guidance provided to LLMs.
| Scored | Grade | Overall | Spec posture | Rubric |
|---|---|---|---|---|
| 2026-09-23 | D | 55 | 2026-07-28+ | v2 |
Error handling returns unstructured text in isError responses. When the Worker call fails, the error message is plain text ('Error checking time: ...') rather than structured JSON with error codes, categories (retryable vs fatal), or actionable next steps. LLMs cannot distinguish between transient network failures and invalid timezone input.
Tool description does not explain when to use check_time vs alternatives or what the DEFAULT_TIMEZONE environment variable does. The description is functional but lacks context for LLM tool selection and multi-step planning.