qm_playlist_build

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

With no annotations, the description carries the full burden and does so well: it states the price ($0.10 USDC on Base via x402), that the live 402 challenge is authoritative, that the tool never pays/touches keys/holds funds, and that resale of the output is permitted. These are exactly the safety and cost traits an agent needs before invoking a paid tool.

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 front-loaded with purpose and price, then the workflow, then safety guarantees. Every sentence is substantive, though the 'never signs / never holds funds / never touches private keys' assurance is repeated in the payment parameter description, creating mild redundancy.

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 paid, two-phase tool with no output schema and no annotations, the description covers pricing, the exact call sequence, safety guarantees, and data-usage rights. An agent has everything needed to invoke it correctly and interpret the result; nothing material is missing.

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%, so the baseline is 3. The description adds value beyond the schema by explaining the payment parameter's role in the two-phase flow (omit on first call, re-call with the signed payload) and clarifying that the server only forwards it to the rail. It slightly exceeds baseline but largely mirrors schema text for mood/minutes.

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 first sentence names a specific verb and resource: a track list built from a mood plus minutes, including per-track sync-license quotes and terms. It immediately distinguishes the output from a mere license grant ("quotes are not licenses"). An agent knows exactly what it produces without opening the 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?

The description gives an explicit two-phase workflow: call without 'payment' to receive live payment requirements, pay from your own wallet, then re-call with the base64 x402 payload. This is clear operational context. It does not, however, contrast itself against any sibling tool or state when-not-to-use it, so it falls short of a 5.

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