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

Annotations already indicate this is a read-write, non-destructive operation. The description adds that the brand is owner-private and requires specific write permission, which provides useful context beyond annotations.

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?

The description is very concise, consisting of two front-loaded sentences. However, this brevity comes at the cost of missing important details, so it is not an ideal balance.

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?

Given a creation tool with 4 parameters (0% schema coverage) and an output schema, the description should provide parameter explanations and usage context. It lacks both, leaving the tool under-documented for an agent.

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 description coverage is 0%, meaning the schema provides no parameter descriptions. The tool description does not explain any of the four parameters (name, voice, guidelines, value_proposition), leaving the agent without guidance on their purpose or usage.

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 clearly states the verb 'Create' and the resource 'marketing brand identity', and specifies it is 'owner-private', distinguishing it from get_marketing_brand and other sibling tools.

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 only usage guidance is the authorization requirement 'Requires marketing:agent_write'. There is no mention of when to use this tool versus alternatives (e.g., update_marketing_brand) or any prerequisites.

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