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

Annotations already declare mutating, open-world, non-idempotent, non-destructive behavior. The description adds valuable behavioral context beyond that: account-type limits (free = 3 songs, Pro = 50), that anyone can open the link, and that output is a shareable ordered link. It doesn't cover error responses or what happens at limit overflow, but it adds substantive non-annotation context.

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 core action and output, followed by the critical limits. No wasted words; every sentence 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?

For a 2-parameter creation tool with annotations and no output schema, the description covers the key concerns: what is created, who can access it, and account-tier limits. It could mention the maximum length of the title or what happens when the limit is exceeded, but it is nearly complete.

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 coverage is 0%, so the description must compensate. It does not explain the 'title' or 'split_ids' parameters, but the schema itself documents split_ids items (a split id from split_songs or list_my_songs) despite the reported coverage metric. The description adds nothing about parameter semantics, so baseline 3 is appropriate given the schema's internal documentation.

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 and resource (make a setlist) and goes further to describe the actual output: one share link that opens songs in order in the browser. This distinguishes it from siblings like list_setlists or split_songs, though it doesn't explicitly name an alternative.

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 implies usage (for a band or a class, with shareable links) but does not state explicit when-to-use or when-not-to-use conditions, nor does it name sibling tools as alternatives. Context is present but guidance is implicit rather than directive.

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