Activity weather

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

Annotations already declare readOnlyHint=true and openWorldHint=true, covering the safety profile and potential for unexpected fields. The description adds minimal behavioral context ('weather recorded during an activity') but does not disclose edge cases such as missing weather data or how it handles activities without weather. It does not contradict annotations, so a 3 is appropriate.

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?

The description is a single, front-loaded sentence with no filler. It communicates the core purpose efficiently. While it could be slightly more informative, it is appropriately concise for a simple tool.

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 only one parameter and an existing output schema, the tool is relatively simple. However, the description lacks essential context: it does not explain what activity_id refers to, how to obtain it, or when to use this tool. The openWorldHint annotation suggests unknown return fields, but the description offers no guidance on expected data shape or usage scenarios.

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%, meaning the schema provides no explanation for activity_id beyond its title 'Activity Id'. The description fails to compensate: it never mentions the parameter or clarifies how to obtain a valid activity_id. The agent is left with no added meaning beyond the bare schema field.

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 clearly states the tool's purpose: it returns weather data recorded during an activity. This is specific and distinguishes it from siblings like garmin_activity (activity details) and garmin_activity_splits (split data). It is not a tautology, though it could be more explicit by adding a verb like 'retrieves'.

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 guidance is given on when to use this tool versus alternatives. It does not mention prerequisites (e.g., needing an activity_id from a prior call), nor does it exclude cases where weather might be unavailable. The usage context is entirely implied.

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