getAvailableDevices

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

With no annotations, the description carries the full burden. 'Get' weakly implies a read-only operation and the OAuth-scoped nature of Spotify Connect is not mentioned, nor whether devices must be active, nor whether permissions (user-read-playback-state) are required.

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?

One sentence, front-loaded with the verb and resource, no boilerplate or redundancy. Nothing in it is wasted.

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?

The tool is simple (no params, no nested schema), but with no annotations and no output schema the description says nothing about what 'information' is returned (device id, name, type, is_active) or why an agent would need it. Adequate but with a clear gap for a discovery tool that feeds downstream playback calls.

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 there is nothing for the description to disambiguate; the baseline for a no-param tool is 4. The sentence does correctly imply that results are implicitly scoped to the calling user.

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 ('Get') and resource ('available Spotify Connect devices'), and the phrase 'Spotify Connect' distinguishes it from playback-control siblings like playMusic and pausePlayback. It falls short of 5 only because it doesn't explicitly contrast itself with a near-neighbor tool.

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 when-to-use guidance, no prerequisites, and no mention of alternatives. An agent must infer on its own that this is the discovery step preceding playMusic/setVolume, which is exactly the kind of routing hint a description should supply.

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