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

Annotations already establish this is a non-read, non-destructive, non-open-world write that is not idempotent (with the idempotency_key param covering retries). The description adds the useful 'catalog can be split across pages' hint, implying repeated calls, but does not describe what actually gets recorded or the effect on the artist's catalog.

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?

Four short, front-loaded sentences with no filler; the core action leads. The stylized fragment ('"That's me":') and clipped phrasing make it slightly cryptic, but nothing is wasted.

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?

No output schema exists, so return values need not be described, and all three params are documented. The description covers the workflow, input constraint, and the ask-the-human rule, leaving only the downstream effect unstated.

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 schema descriptions already explain artist, deezer_ids, and idempotency_key. The description adds a genuine constraint beyond the schema: deezer_ids must be ones find_my_music offered, not arbitrary ids.

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 action (record the candidates the artist said are theirs) and its resource scope, and explicitly distinguishes it from the sibling find_my_music by requiring 'only ids find_my_music offered.' An agent can tell this is the confirmation step that follows candidate discovery.

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?

Gives clear workflow context (use ids find_my_music offered; the catalog may be split across pages) and a firm rule: 'Ask the artist. Never confirm on a guess.' It stops short of enumerating when-not-to-use scenarios or naming other alternatives, but the intent is unambiguous.

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