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

With no annotations provided, the description carries the full burden. It openly declares that the operation is a read ('Read'), mentions the authentication requirement, and specifies what data is returned. It doesn't detail response format or edge cases, but for a simple no-parameter getter this is solid disclosure.

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 two sentences and contains no filler. The first sentence packs a lot of detail into a long clause, but every piece is useful, and the second sentence adds concrete usage guidance.

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 simple read-only, no-parameter tool, the description covers what it does, when to call it, and what prerequisite is needed. It doesn't enumerate response format or error behavior, but it is otherwise complete for an agent selecting and invoking it.

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?

The tool has zero parameters and schema coverage is 100%, so there are no parameter gaps. The description adds useful context by explaining that the implicit subject is the current API key's account, which clarifies what the empty input schema means.

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 clearly identifies a specific verb ('Read') and resource ('plan behind the API key', quota, link counts), and the scope is account-level, distinguishing it from all link/QR-focused siblings. It directly explains what information is returned, leaving no ambiguity about the tool's function.

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?

It gives explicit practical guidance: 'Worth calling before a bulk run' and states a prerequisite ('Requires a ShareCut API key (Business plan)'). It doesn't list exclusions or alternative tools, but no account-level sibling exists, so this is sufficient context.

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