singapore_get_wind_direction

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

Annotations already declare the safe, idempotent, read-only profile, so the description's job is to add beyond that. It does contribute non-obvious behavior about default-to-latest, local-limit grouping, and consuming offsets before reusing the pagination token, but the pagination sentence is cryptic ('timestamp groups', 'preserved upstream pagination token') and never states the return shape or ordering.

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?

Purpose is front-loaded and there is no filler, but the middle sentences are denser than they need to be, especially the opaque pagination instruction, which costs clarity for no stated benefit.

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?

An output schema exists, so return values need no explanation, and the safety profile is annotation-covered. However, with seven parameters at 14% schema coverage, the description should explain the filtering/identifying parameters (area, region, station_id) to make the tool callable with confidence — that gap remains.

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 only 14% — of seven parameters, only date is documented in the schema. The description clarifies date locality and defaults plus some limit/offset/pagination_token interaction, but says nothing about area, region (the one enum), or station_id, leaving three parameters meaningless to the agent.

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?

Identifies the specific resource (NEA wind direction in degrees) with enough precision to separate it from singapore_get_wind_speed and the other weather siblings. The verb is implicit in the name rather than the description, but the substance is unambiguous.

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?

"latest if omitted" gives a default-behavior hint, but there is no explicit guidance on when to pick this over wind_speed/air_temperature or which filter combination to use for a given question. Usage is only implied by the date/pagination remarks.

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