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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It explains the output (three directions with specific attributes), the return of direction_id, and the dependency on the same brief and seed for build_page, which is a useful behavioral constraint. However, it does not disclose potential side effects, failure modes, or performance characteristics, which is a moderate gap for a creative generation tool.

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 zero wasted words. The main purpose is front-loaded, followed by the specific output components and the crucial linkage to build_page. Every sentence contributes value, making it both concise and logically structured.

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 tool that lacks an output schema, the description adequately explains what is returned (three design directions, each defining layout grammar, typography, imagery, motion physics, density rhythm, avoid rules) and how the direction_id is used downstream. It covers the essential usage context but does not elaborate on selection criteria among the three directions or any constraints on the brief's format, which are minor omissions given the tool's creative nature and sibling tool complement.

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 100%, so both parameters (brief and seed) are already documented in the schema. The description adds minimal extra meaning: it clarifies that the brief is a 'business/page brief' and implies seed is for reproducibility, but these are near-duplicates of the schema descriptions. The baseline of 3 applies since the schema does the heavy lifting and the description offers only marginal amplification.

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 uses a specific verb ('Turn') and names the resource ('business/page brief') and the output ('three deliberately different design genomes'). It explicitly differentiates from build_page by stating that the returned direction_id is passed into build_page, clarifying its role as a precursor step. This allows an agent to distinguish propose_directions from its siblings without ambiguity.

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 clearly indicates when to use the tool: when you have a brief and want three distinct design directions before choosing components. It also provides the follow-up step (passing direction_id into build_page with the same brief and seed), which guides sequential usage. However, it does not explicitly state when NOT to use it or name alternative tools for other scenarios, leaving some inference to the agent.

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