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

Annotations already declare destructiveHint=true and idempotentHint=true, so the safety profile is covered structurally. The description nevertheless adds real value by stressing 'Permanently' — clarifying that idempotent does not mean reversible — and states the return shape ('updated complete kit'). It still doesn't cover error behavior when the item is absent.

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?

Two tight sentences, with the destructive scope and the operation front-loaded before the return statement. Nothing is redundant and nothing is padded.

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 3-parameter mutation tool with full schema coverage, rich annotations, and an output schema, the description supplies everything the agent still needs: what is removed, that removal is permanent, and that the full updated kit is returned. No material gap remains.

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%, with each parameter documented and the 'kind' enum enumerated, so the schema already carries the semantics; baseline 3 applies. The description contributes only the implicit 'owned kit' constraint on media_kit_id, which is modest beyond-the-schema value.

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 ('Permanently remove') and the exact resource class (rate, brand partner, case study, portfolio video) scoped to 'an owned kit', so an agent knows exactly what operation this is. It does not explicitly name the sibling it complements (media_kit_upsert_item), so it stops short of full sibling differentiation.

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?

Usage is only implied by the purpose statement: an agent infers this is the tool for deleting an existing kit item. There is no explicit when-to-use framing, no mention of the add/complement path (media_kit_upsert_item), and no stated preconditions such as ownership or prior lookup.

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