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

Annotations only declare non-readOnly, non-openWorld, non-idempotent, non-destructive, which doesn't reveal much. The description adds the permission requirement and the 'owner-private' nature, which is useful. However, it doesn't disclose side effects, return value, or any constraints beyond creation. Given annotations are minimal, the description carries more burden but still falls short of rich behavioral 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?

The description is one short sentence plus a permission note, very concise. It front-loads the core action and uses no extraneous words. However, it is so brief that it misses important information, though that's more of a completeness issue than conciseness.

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 create operation with no output schema, the description should explain what happens (e.g., returns created brand, any side effects). It also fails to describe parameters or usage scenarios. Given the tool has 4 parameters and zero enrichment, the definition is incomplete for an agent to invoke correctly without further inference.

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 description does not explain parameters. The schema has name (required), voice, guidelines, and value_proposition, but the description provides no guidance on what these mean or how they relate to brand creation. This is a significant gap since the description must compensate for low schema coverage.

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 states a specific verb ('Create') and resource ('brand identity'), and clarifies it is 'owner-private', distinguishing it from related siblings like create_marketing_audience or create_marketing_campaign. The purpose is unambiguous.

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 provides clear context that this creates a brand identity and specifies a required permission (marketing:agent_write). It does not explicitly mention when not to use it or name alternatives, but the 'owner-private' qualifier gives enough context for typical use cases.

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