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

Annotations already declare readOnlyHint=false, destructiveHint=false and openWorldHint=true, but the description adds the crucial asynchronous pattern ('Answers at once with the kit building; poll get_brand_kit') and the cost ('Free'), neither of which is in the annotations. It omits permissions and what happens to the source logo.

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?

Three short sentences, front-loaded with the purpose and ending with the follow-up tool. 'Free.' is a useful standalone signal, though the phrase 'Answers at once with the kit building' is slightly awkward and could be tighter.

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 async job with no output schema, the description covers what is produced and how to retrieve it. It could say more about poll timing or when the kit is ready, but nothing essential for a correct invocation 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% and the schema already describes logo_id as coming from create_logo or list_logos, so the description's only added nuance is the 'finished' qualifier. With a single fully documented parameter, baseline 3 applies.

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 ('Turn ... into a brand kit') and resource, and enumerates the concrete outputs (colour palette with roles, vector version, favicons, app icons, lockups). An agent can distinguish this from create_logo and get_brand_kit without opening any 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?

It gives the entry condition ('a finished logo') and explicitly routes the agent to get_brand_kit for polling, plus notes the call is free. It does not state any when-not-to-use condition or prerequisites for the source logo, so it stops short of full routing guidance.

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