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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds value beyond them: it is free (no billing/auth cost concern) and it deliberately discloses what the pack does NOT do, which is behavioral signal an annotation cannot carry. It does not describe the size or format of the response.

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?

One sentence, front-loaded with the core action, then scope, then the notable non-coverage clause, closing with the cost/input note. Every clause adds information an agent would otherwise have to guess; nothing is redundant with the title.

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, no-output-schema tool the description must carry the return-value burden, and it does list the contents (tools, edition, coverage dimensions, exclusions). The only gap is the shape/ordering of the returned document, which an agent cannot predict but also does not strictly need to call 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?

Zero parameters, so the baseline is 4; 'needs no input' explicitly confirms that the empty schema is intentional rather than a documentation gap. No further parameter meaning is needed.

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?

States a specific verb and resource ('Lists Spark Pack's tools') and enumerates the payload: regulations edition, coverage of nations, circuit types, cable types, installation methods, and explicit non-coverage. No sibling (check_certificate, size_cable, trade_profile) does catalog discovery, so the tool is unmistakable from its description alone.

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?

'Free, needs no input' signals this is a cheap, always-safe discovery call, which is exactly the context an agent needs to decide to call it before domain tools. It stops short of an explicit directive like 'call this first to learn coverage limits before sizing', and there are no true alternatives to exclude, so it lands just under a 5.

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