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

Annotations establish that this mutates state, is idempotent, and is open-world, but the description adds substantive traits the annotations do not: the link is publicly viewable and listenable, saved changes stay in sync, private chats and credits are excluded, and publishing clears Showcase approval. That last point is an important side effect that an agent would otherwise miss. It stops short of describing what the call returns or how link revocation works.

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?

Six short clauses, front-loaded with the action and public-visibility fact, with no filler. The telegraphic style occasionally costs clarity — 'No private chats or credits' is ambiguous without context — 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?

For an open-world mutating tool with no output schema, the description covers scope, defaults, idempotency, and one side effect, which is substantial. It omits what a successful call returns (the share URL or identifier) and how the published link can later be read or revoked, leaving an agent to guess the next step.

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%, so the schema already documents all six parameters and their defaults; restating 'Copies default on, media/history off' is reinforcing rather than additive. The one genuine semantic contribution is the request_id retry instruction, which goes beyond the schema's terse 'Stable UUID' wording. Net effect is close to baseline.

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 description opens with a specific verb and resource, 'Create a score link,' which is clearer than the title alone. It does not explicitly differentiate itself from nearby siblings such as get_score_share or stop_score_share, so an agent must infer that this is the creation step of a share lifecycle.

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 phrase 'when asked' gives a loose trigger condition, and 'Reuse request_id after an unclear result' gives useful retry guidance. However, it never states when not to use it (e.g., an existing link already shared, or reading an existing share with get_score_share), so routing against siblings is only implied.

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