get_daily_hydration

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety is covered. The description adds only 'inclusive calendar date range' and an unelaborated claim about date restrictions inherited from an official client — no pagination, no volume expectations, no statement of what happens for dates outside the allowed window.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

Short, but the Chinese and English sentences are largely redundant restatements of the same idea. '与官方客户端 get_daily_hydration 一一对应' adds no actionable information and pushes the genuinely useful phrase ('inclusive') to the end.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

With no output schema and 0% parameter documentation, the description should carry the retrieval contract. It omits the date format, the maximum allowed range, what metrics a 'hydration statistics' record contains, and whether a single day or a span returns different shapes.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%: both start_date and end_date carry only a title and a string type. The description's phrase 'inclusive calendar date range' is the sole semantic hint and still omits the date format, timezone, and any maximum span — with low coverage the description was obligated to compensate and does not.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb and resource: return daily hydration statistics over a calendar date range. The resource (hydration) is self-evidently distinct from siblings like get_daily_steps or get_daily_sleep, so an agent can route on it, though the description never names a sibling explicitly.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

No when-to-use guidance and no exclusions versus the other daily-metric tools. The line '参数和日期限制沿用官方接口' merely defers to an unnamed 'official interface' without stating any actual constraint, leaving the agent to guess at range limits.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.