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

No annotations are provided, so the description carries the full behavioral burden. It implies authentication via 'authenticated user' and hints at aggregated read data, but says nothing about read-only safety, empty-state behavior when nothing is logged, timezone/date-rollover semantics, or error handling — all relevant for a 'today' query.

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?

A single front-loaded sentence with zero filler that names all three returned data points. Every word earns its place.

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?

For a simple one-parameter read tool with no output schema, the description adequately summarizes the return contents (weight entry, food, calories). It falls short only on edge behavior (no data logged, date boundary) and any sibling routing, which keeps it from a 5.

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 100% and the single 'date' parameter is fully documented in the schema (ISO format, defaults to today). The description adds only the implicit notion of 'today', which is already covered, so baseline 3 applies.

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 ('Return') and enumerates the resources returned: today's weight entry, logged food, and calorie total, scoped to the authenticated user. It is clear what the tool does, but it never names or contrasts with siblings like listEntries or getForecast, so an agent must infer the distinction.

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?

There is no statement of when to use this versus listEntries, getForecast, or logFood, and no mention of prerequisites. The 'today' framing implies a daily-summary use case but the description never makes that explicit.

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