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

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety and external-network behavior are covered. The description adds only the minor behavioral detail that lookup is keyed by URL rather than an ID, and says nothing about failure modes (invalid/private URLs) or rate limits.

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?

A single front-loaded sentence with no filler; the resource and its resolution mechanism come first. Slightly terse, but nothing 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?

For a single-parameter, read-only lookup with an output schema that already documents return values, the description supplies the essential facts. It is nearly complete, missing only edge-case behavior for invalid or unavailable track URLs.

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 description coverage is 0% and the single `url` parameter is an undescribed string, so the description carries the burden. It usefully specifies that the input must be a track URL (not a track ID or search term), which is the key semantic an agent needs; format examples are still absent.

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?

Names a specific resource (a SoundCloud track) and its scope (full metadata), and states the resolution mechanism (from its track URL). This makes it distinguishable from siblings like soundcloud_playlist, soundcloud_profile, and soundcloud_user_tracks, though it lacks an explicit verb.

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?

Implied usage only: an agent can infer it is used when a track URL is available, since the description says the resource is 'resolved from its track URL.' No explicit when-to-use, prerequisites, or alternatives (e.g., soundcloud_search for finding tracks) are named.

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