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

Goes well beyond the annotations: discloses the required capability (manage_categories for categories/tags), two concrete failure modes (nonexistent parent refused, duplicate name refused unless a distinct slug is given, scoped to same parent in hierarchical taxonomies), and the return payload. Slightly short of 5 only because it does not say whether a failed create is atomic/no-op or whether it is safe to retry given idempotentHint=false.

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?

Front-loaded with what is created and what is returned, then permissions, then failure modes, then the sibling pointer. Every sentence carries decision-relevant information; nothing is restated from the name or 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?

With no output schema present, the description supplies the return shape ({created: true, term_id}), the permission requirement, the refusal conditions, and the single-site forwarding scope. That is everything an agent needs to invoke a 5-parameter create tool correctly.

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 the baseline is 3, but the description adds real semantics on top: the 'parent' parameter must reference an existing term and only matters for hierarchical taxonomies, and name uniqueness is evaluated per-parent. That is behavior the schema's per-parameter text does not spell out.

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?

Specific verb + resource: 'Create a new term (category, tag or custom taxonomy term) in a taxonomy.' Explicitly distinguishes itself from wp_update_term ('Existing terms are changed with wp_update_term') and implicitly from wp_delete_term/wp_list_terms, so an agent can route correctly without opening a schema.

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?

Names the alternative tool (wp_update_term) and the condition that selects it, i.e. existing terms. Also states the connection scope ('the one site this connection reaches'), which tells the agent when this tool is applicable versus a network-level tool.

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