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

The annotations already flag destructiveHint=true and idempotentHint=false, and the description usefully explains exactly what is destroyed: an earlier chat-made master is replaced while downloaded ones survive. It also says progress is visible in the studio, but does not address cost, duration, or why the call is non-idempotent.

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?

Three sentences, front-loaded with the action, then prerequisites, then side effects. Every sentence carries information; only the parenthetical style example is slightly redundant with the enum.

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?

Prerequisites, replacement behavior, and where the result appears (studio progress playback) are all covered, and there is no output schema requiring return-value explanation. Minor gaps remain around failure modes and relationship to the other mastering siblings.

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 100% and the preset enum already documents streaming/optimal/loud, so the schema does the heavy lifting. The description only adds a loose example of a style name ('louder': loud), which is marginal added value.

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 (masters) and resource (the song's finished mix), and adds the re-mastering case. It does not explicitly differentiate itself from the similar siblings master_song, prepare_full_master, or mix_and_master, so an agent must infer the distinction from the prerequisite wording.

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?

Preconditions are stated plainly: the song needs a finished mix from mix_and_master or an uploaded one, and the tool can be re-run to produce another style. It narrows usage well but never explicitly says when to pick this over master_song or prepare_full_master.

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