get_user_profile

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

The annotations already declare readOnlyHint=true, openWorldHint=true, and destructiveHint=false, so the safety profile is covered. The description adds source context ('Garmin Connect') and reiterates read-only behavior, but the date-format note is not relevant to a zero-parameter tool and it does not discuss authentication, rate limits, or output behavior beyond what annotations and the output schema already provide.

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 short and front-loads the main purpose before the parenthetical context. The date-format note is unnecessary for a tool with no date parameters, which keeps it from being maximally efficient, but overall there is little wasted text.

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 zero-parameter, read-only tool with an output schema and explicit annotations, the description gives enough context to call it correctly: it identifies the source, contents, and safety profile. The main remaining gap is lack of explicit differentiation from adjacent user-summary and user-statistics tools.

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?

This tool has zero parameters, so there are no parameter semantics for the description to clarify. The baseline for zero-parameter tools is 4, and there is no parameter-related confusion introduced by the description.

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 states a specific verb and resource: return user settings for Garmin Connect, with example content such as user data, units, formats, and sleep times. It is clear enough to distinguish this from activity, sleep, and health metric tools, though it does not explicitly contrast with nearby siblings like get_user_summary or get_user_statistics.

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?

The description says what the tool returns but gives no guidance on when to use it instead of alternatives. With many sibling tools such as get_user_summary and get_user_statistics, the agent must infer that this is for profile/settings data rather than summary or statistics data.

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