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

Annotations already establish read-only, idempotent, closed-world, non-destructive behavior, so the description is not burdened with the safety profile. It does add non-obvious facts a caller could not infer: history begins October 3, 2026, and coverage limits vary by dataset rather than being uniform. It does not indicate whether results are static or refreshed, but that is a minor residual gap.

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 short sentences, with the highest-value content (what is covered, the history start date) placed first. The opening fragment is slightly elliptical and reads as a list of contents, but no sentence is padded or redundant.

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?

With zero parameters and no output schema, the description carries the burden of telling the agent what comes back, and it does so by listing the content categories plus the coverage caveat. The main omission is any sense of the response's shape or size — e.g., whether it returns a single summary record or a per-dataset list — which matters for a no-argument catalog call.

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 no parameters, so per the baseline this scores 4. The description correctly introduces no parameter discussion and instead names a sibling tool for the parameterized question an agent might mistakenly expect here.

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 enumerates the concrete contents of the overview: what Launch Tape records, dataset descriptions, USD plan prices, and coverage limits. That is enough for an agent to know this is the catalog/pricing reference tool. It falls short of 5 because the opening is a noun-phrase fragment rather than a verb+resource statement, and it does not contrast with my_plan, which likely also carries plan/pricing information.

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?

There is one explicit routing instruction: use days_available for the exported UTC day range, which correctly diverts a related question to a sibling. Beyond that, usage is only implied — nothing says whether to call this before other tools or how it differs from my_plan or data_preview when the agent needs plan or dataset facts.

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