Check the API key

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

Annotations already declare readOnlyHint=true and openWorldHint=false, so safety is covered; the description goes further by enumerating the returned facts, including quota state ('launches left and the hourly request budget'), which is exactly the rate-limit context the rubric rewards. With no output schema, this enumeration is the only source of return-value information and it delivers it.

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?

Two short sentences with zero waste: the payload is front-loaded in a single enumerating clause, and the usage directive follows. Nothing restates the name or title verbatim.

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 zero-parameter read-only diagnostic with no output schema, the description supplies everything needed: the full list of returned fields and the instruction to invoke it first. No auth, side-effect or pagination concerns exist for this tool, so 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?

The tool takes zero parameters, so there is nothing for the description to disambiguate — the baseline for a no-param tool applies. The description correctly adds no parameter talk, keeping it clean, though it also adds nothing beyond 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?

Uses a specific verb ('Shows') against a precisely enumerated resource: the agency, mode, permissions, launches remaining and hourly request budget behind the API key. An agent knows exactly what this tool returns and needs no sibling comparison, since no other tool in the list inspects key state.

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 closing imperative 'Call it first' gives a clear timing/sequencing directive that an agent can act on. It stops short of stating when not to call it or what to do with the results, so it is clear context rather than a full when/when-not rule set.

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