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

Annotations already declare readOnlyHint, idempotentHint, false destructiveHint and closed-world (openWorldHint=false). The description adds genuinely new context: it is a 'static reference, no network access', and the response shape differs based on whether kind is supplied (counts per kind vs. full rule detail).

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 kind enumeration is long but front-loaded and informative rather than filler, and the two trailing clauses (counts without kind, static/no-network) carry real operational weight. Slightly dense for a single-parameter read tool, but nothing is wasted.

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 one-optional-parameter, read-only reference tool with no output schema, the description covers the domain, the enum categories, the conditional return shape, and the no-network nature. Only a pointer to how the returned markers/portability ratings should be consumed is absent.

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 coverage is 100% and the enum values are already documented, so the baseline would be 3. The description goes further by explaining the result-set behavior when kind is omitted, adding meaning the schema does not carry.

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 ('List the rules Own It uses to name vendors') and enumerates the concrete rule categories covered, so the agent knows exactly what is returned. It does not reference the sibling tools (audit_ownership, check_domain_control), but their scopes are distinct enough that confusion is unlikely.

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 gives a usage condition for the parameter ('Without kind it returns counts per kind'), which helps the agent choose between a summary and a filtered call. However, it never says when to reach for this tool versus the sibling ownership/control tools, so alternative selection is left to inference.

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