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

Annotations already declare destructiveHint=true, idempotentHint=false, readOnlyHint=false, so the safety profile is supplied — but the description frames the tool as a harmless toggle and never explains what is destroyed: an existing logo, the prior end-card configuration, or the underlying attachment. It also adds nothing about required listing state or any processing delay. For a destructive mutation this is a real gap in narrative context.

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?

A single sentence with no filler, and the primary action is front-loaded. The trailing 'or use an uploaded logo (attachment storageId)' is a compressed parenthetical that reads slightly ambiguously, 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?

An output schema exists, so return values need not be described. However, for a destructive, non-idempotent mutation the description omits what is overwritten, whether the toggle and the upload are mutually exclusive modes, and what the agent should expect afterward — the most important context for calling this safely is missing.

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 schema already documents all three parameters, including that storageId comes from upload_media and listingId from list_listings — the description only repeats the storageId hint in compressed form. It adds no meaning about the interaction between 'enabled' and 'storageId' (e.g. whether supplying a storageId implicitly enables the card). Baseline 3 is appropriate when the schema carries the load.

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?

The description names a concrete verb pair ('turn ... on or off') and a concrete resource ('the logo end card'), plus a second mode ('use an uploaded logo'). An agent can tell what resource this mutates without opening the schema. It does not distinguish itself from look-alike siblings such as set_headshot or set_title beyond the resource name, which is why it stops at 4.

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 implied rather than stated: set the logo end card on a listing, optionally with an uploaded asset. There is no explicit when-not guidance and no named alternative, and the sentence does not say what happens when 'enabled' and 'storageId' are combined. Adequate but leaves the agent to infer the calling conditions.

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