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

Annotations already declare readOnlyHint, openWorldHint, idempotentHint, and non-destructive behavior. The description adds meaningful behavioral context by noting that responses state actual coverage and missing evidence, which informs the agent about output expectations and limitations beyond the structured fields.

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 short sentences with no filler. It front-loads the main action and then adds the key limitation and response expectation without wasting words.

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?

Given the high complexity — ten parameters, no output schema, and twelve distinct package IDs — the description is under-specified. It clarifies which packages are callable and response behavior, but fails to document parameter semantics, parameter selection guidance, or what a package screen actually returns.

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 description coverage is 0%, and the description provides no explanation for any of the nine optional parameters such as area, make, year, query, or latitude/longitude. Only package_id is discoverable via its enum, so the agent must guess at parameter meaning and combinations from names alone.

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 uses a specific verb ('Execute') and a clear resource: one of twelve individually implemented free official-data screens. It also distinguishes itself by stating that other package concepts are not callable, which helps differentiate from sibling tools like intelligence_package_directory.

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 description implies that this tool is the execution entry point for the twelve listed package IDs, and warns against attempting other package concepts. It does not explicitly name alternatives or state when to prefer this over directory or evidence tools, so usage guidance is mostly implied rather than direct.

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