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

Annotations already declare readOnlyHint=true, so safety is covered. The description adds real behavioral context beyond that: the operation is free and results are ordered newest-first. It omits pagination and filtering behavior, keeping this at a solid but not rich 3.

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 telegraphic fragments with no waste; the cost attribute is front-loaded and the ordering constraint follows. Slightly clipped style costs it nothing but doesn't earn a 5.

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?

Adequate for a simple read-only list tool with no output schema, since annotations carry the safety profile and the schema carries parameter types. However, the description gives no indication that results can be filtered by generation status, which is a meaningful gap for an agent hunting pending or failed songs.

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% for two parameters, and the description never mentions 'limit' or 'status'. 'Most recent songs' only loosely gestures at the default ordering/limit behavior, so the status enum — the one parameter an agent most needs explained — is entirely undocumented.

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 clear verb-resource pair (list the user's songs) with scope qualifiers: 'most recent' and 'newest first'. That distinguishes it from generate_music and get_generation, though no sibling is named explicitly.

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 or when-not-to-use guidance; nothing tells the agent how this relates to get_generation or when the status filter should be applied. 'Free' is a cost hint but not a selection rule.

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