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

Annotations already cover readOnly, idempotent and closed-world, so the bar is low; the description still adds non-structured context by stating the call is free, disclosing that results are cursor-paginated via nextCursor, and noting the MCP-vs-app limitation on collection project creation. It does not say what happens if the artist has no collections.

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?

Two sentences, front-loaded with the action and enumerated return fields, with the workflow caveat placed last. The 'Free and read-only' clause partially duplicates the annotations, but the sentence is compact and everything after it earns its place.

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?

An output schema exists so return-shape explanation is not required, yet the description still lists the salient returned fields and the pagination mechanism. Combined with the workflow caveat, an agent has enough to call it correctly; only the absence of an explicit alternative-tool routing holds it below 5.

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 100% and all three parameters are documented in-schema, so the baseline of 3 applies. The description names nextCursor and artistId-adjacent concepts but adds no syntax, format or constraint meaning beyond what the schema already states.

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 (Lists) and a precise resource (an artist's album, EP and single collections), and enumerates the descriptive fields returned. The closing note distinguishes collection releases from the standalone releases that studio_release_create/MCP project creation produces, so an agent can separate it from its siblings without opening a schema.

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?

Usage is implied (call it to enumerate an artist's release collections) and the last sentence clarifies which release-creation path yields collections vs standalone releases, but it never states when to choose this tool over studio_projects_list or studio_release_create, nor any preconditions beyond needing an artistId.

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