Assign playlist

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

Annotations already cover read-only, destructiveness, and idempotency. The description adds context that the playlist must be existing and that the tool only changes the device-playlist assignment. However, it does not disclose behavior like overriding an existing playlist, prerequisites, or return values, so moderate transparency.

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 two sentences, front-loaded with the primary action, and the second sentence adds a clear boundary. Every word is purposeful and no content is redundant. Excellent conciseness.

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?

This is a simple tool (2 required params, no output schema, annotations present). The description covers the core purpose and a limitation, but it omits important context such as whether the device or playlist must exist, what happens if the device already has a playlist, or the tool's effect on existing assignments. While annotations fill in the safety profile, behavioral edge cases are unclear.

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 input schema has 0% description coverage for its two parameters. The description only vaguely implies that playlist_id refers to an existing Terminus playlist and device_id to a device, but provides no further semantics, constraints, or usage details for the parameters. This is insufficient compensation for the schema's lack of descriptions.

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 uses a specific verb and resource: 'Assign an existing Terminus playlist to a device.' It clearly differentiates from siblings by adding 'No other device setting can be changed by this tool,' which distinguishes it from update_screen and other device-management tools.

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 implies usage (for assigning a playlist) and states a limitation (no other settings), but it does not explicitly name alternatives or when-not-to-use conditions. Siblings like save_playlist or update_screen are not referenced, so the guidance is implied rather than explicit.

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