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

Annotations already declare readOnly/idempotent/openWorld; the description's "runs straight away" adds the non-obvious fact that no approval or dry-run step occurs, and the enumerated return fields substitute for the missing output schema. It doesn't cover pagination limits or cost, but that's minor given the safety profile is fully annotated.

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?

Purpose and return shape are front-loaded and every sentence carries information about what to do with the result. The site parenthetical and the "read-only" clause partly duplicate the site_id enum and annotations, which is the only waste.

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 7-parameter read tool with no output schema, the description covers what is returned and why the tool matters (ID resolution, tree walking). Filtering behavior is delegated to a fully documented schema, which is acceptable.

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%, so page/per_page/parent/search/hide_empty are all self-documenting. The description adds only "paginated output" and a hint about taxonomy trees (relevant to parent) and nothing about the filtering parameters, so it meets but does not exceed the schema 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?

States a specific verb and resource ("List terms in any registered taxonomy") plus the returned fields, so the agent knows exactly what it gets back. "Any registered taxonomy" implicitly distinguishes it from the category/tag-specific siblings (wp_get_categories, wp_get_tags), though it never names them.

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?

Gives concrete motivating uses: map term names to IDs before wp_add_post_terms, or walk a taxonomy tree. It names a downstream sibling and a use case but offers no exclusions, e.g. it doesn't say to prefer wp_get_categories when only categories are needed.

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