get_devices

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

Annotations already declare readOnlyHint=true, openWorldHint=true, and destructiveHint=false, so the description's 'read-only' note is largely redundant. The 'Dates are YYYY-MM-DD' note is irrelevant for a zero-parameter tool and reads as leftover boilerplate, adding no real behavioral context.

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 core sentence is front-loaded and efficient, but the parenthetical date-format note is irrelevant for a no-argument tool and does not earn its place. Two sentences total, but one of them should have been omitted.

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 full annotation coverage, the description gives enough to identify what is returned (the user's available devices). Device fields and return shape are covered by the output schema, so no major 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?

The tool takes zero parameters, so the baseline is 4; no parameter semantics are needed. The stray date-format remark does not map to any actual input and is merely noise rather than a genuine parameter clarification.

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 and resource ('Return available devices') and scopes it to the current user account. It is clearly distinguishable from data-oriented siblings like get_daily_heart_rate_stats or get_steps_data, though it does not explicitly contrast with get_device_last_used.

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 explicit when-to-use guidance, no exclusions, and no mention of the closely related sibling get_device_last_used. Usage is only implied by the tool name and the phrase 'current user account'.

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