trmnl_get_device_playlist_coverage

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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint=false, so the safety profile is covered. The description adds real value beyond that by defining the semantics of the returned windows (minutes since midnight, account timezone, end inclusive) and identifying the underlying endpoint. It does not mention the profile-scoping behavior or authorization requirements.

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?

Three short, front-loaded lines: purpose first, then the semantics of the output units, then the API mapping. Little waste, though the raw endpoint line is marginally redundant with the tool name.

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 no output schema, the description carries the burden of explaining the return value. It explains the unit and timezone convention of the windows but not the response shape (e.g., per-day window lists), what an empty result means, or how the profile parameter affects coverage — leaving gaps for a compute-style read tool.

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 around 50%, and both visible parameters (path.device_id, profile) already carry descriptions in the schema. The description adds no additional meaning about what device_id accepts or how the profile parameter changes the result, so it neither compensates for the coverage gap nor detracts.

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 names a specific resource and computed output: the times in a week when a device's playlist has nothing scheduled. It's clearly a read/compute operation over a device playlist, though it never distinguishes itself from nearby siblings such as trmnl_get_device_timeline or trmnl_get_playlist_item_schedule.

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 framing ('shows nothing scheduled') implies the use case is gap analysis on a playlist, but there is no explicit when-to-use, no prerequisites, and no pointer to alternatives. An agent must infer that this is the tool for finding scheduling holes rather than reading scheduled items.

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