delete_favorite_album

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

Since no annotations are supplied, this description carries the full load. It discloses the necessary prerequisite (valid login session or Cookie) and the no-op error when the album is not in favorites, which goes beyond the obvious 'delete' implication. It also summarizes the return structure, though it doesn't mention potential side effects or 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?

The description is compact: two primary sentences plus clean parameter and return sections. No word is wasted, and the purpose and prerequisites are front-loaded, making it easy for an agent to parse quickly.

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 one-parameter tool with an existing output schema, this description covers the key requirements: authentication, the edge-case failure, parameter semantics, and return fields. There is no meaningful missing information that would prevent correct invocation.

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 schema only declares 'album_id' as a string with no description, while the description explicitly says it supports a pure album ID, a JM prefix, or an album link. This meaningfully extends the schema and is essential for an agent to format the parameter correctly.

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 explicitly states the action: cancel the current account's favorite of an album, which clearly identifies the tool's purpose and distinguishes it from the sibling add_favorite_album. It also adds specific context about required authentication and the non-mutating failure case when the album is not already in favorites.

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 doesn't explicit name alternatives or state when-to-use versus add_favorite_album or browse_favorite_albums. It provides useful context such as requiring a valid login session/Cookie and the error behavior, but usage is mainly inferred from the tool name and the singular action.

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