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

Annotations already state readOnlyHint=false, destructiveHint=false, and openWorldHint=false, so the safety profile is covered. The description adds genuinely new behavioral context: accepted image formats, a 10 MB size ceiling, and the owner-authentication requirement. It stops short of saying whether an existing logo is replaced or what happens on a rejected URL, which is the main remaining gap.

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 sentences with no filler, and the core action is front-loaded before the constraints and the auth precondition. Every clause carries usable information.

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-parameter mutation with annotations covering the safety profile and no output schema, the description is nearly complete: it covers the source, formats, size limit, and auth. What it omits is whether setting a logo overwrites the previous one, which matters for an agent judging side effects.

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?

The single parameter is fully documented in the schema ("Public https address of the logo"), so the baseline is already high. The description still adds value by constraining that URL to PNG/JPEG/WebP and a 10 MB cap, information 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?

The description gives a specific verb and resource ("Sets the hotel's logo") plus the source of the asset (a public web address). It does not distinguish itself from the sibling add_photo, so an agent must still infer whether logo-setting is a distinct operation from adding a photo.

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 supplies a real precondition ("Needs the owner's sign-in"), which tells the agent when the call will be permitted. It gives no guidance on when to choose this over add_photo or how it relates to other hotel-profile tools, so the routing guidance is only implied.

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