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 real behavior beyond that: the response combines published service periods for one day with the hall's recurring weekly schedule, and an omitted hall fans out to all halls. Error/empty cases (closed days, out-of-window dates) are still not addressed.

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?

Two tight sentences with zero filler. The core behavior is front-loaded and the optional-argument default follows immediately as the one piece of operational nuance worth stating.

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 an output schema present, the description need not explain return values, and annotations cover the read-only/open-world profile. It covers the multi-hall default and the composed return content, though it leaves the edge case of dates outside the publication window to the schema.

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 coverage is 50%: the date parameter is well documented in the schema (format plus the today-3 to today+14 publication window), while hall has only an enum and no description. The description compensates for the hall gap by stating it is optional and that omitting it returns all halls, but adds nothing about date semantics.

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?

The description gives a specific verb and resource: it returns the service periods published for a dining hall on a requested day, plus that hall's regular weekly schedule. That is clearly distinct from get_menu (dishes) and find_open_now (live status), though it never names a sibling to make the distinction explicit.

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?

It hints at usage by noting that omitting the hall argument returns every hall, which tells the agent how to broaden the query. But there is no guidance on when to prefer this tool over find_open_now or get_menu, and no stated conditions or exclusions.

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