create_design_brief

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

Annotations already declare readOnly, idempotent, non-destructive and open-world behavior, so the safety profile is covered. The description adds little beyond that: it does not say the tool fetches live Awwwards pages (openWorld), what the synthesized brief looks like, or how citations are attached. Note the mild tension between the 'create_' name and readOnlyHint=true, though the description's 'synthesize' wording does not itself claim persistence.

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?

A single front-loaded sentence with zero filler, and the key input constraint leads the phrasing. It is efficient, though arguably too sparse for an eight-parameter tool.

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 an eight-parameter, no-output-schema tool, the definition omits what the brief contains, what citations mean, how audience/constraints/maxBands shape the result, and that live external sites are fetched. An agent can form a rough call but not a confident one.

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 only 25% — viewport and waitStrategy are documented in-schema while goal, audience, maxBands, constraints and includeStructure are not. The description only restates the slugs constraint (2–5 references), adding no meaning for the other six parameters, so it fails to compensate for the coverage gap.

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 (synthesize), resource (design direction / brief), and input scope (2–5 Awwwards references), which cleanly separates it from sibling analysis tools like compare_sites or analyze_page_structure. It stops short of saying what a brief actually contains, so it is clear but not fully self-explanatory.

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?

There is no guidance on when to reach for this tool versus the many sibling analysis tools, nor any prerequisites or exclusions. The only implicit signal is that you need 2–5 reference slugs in hand, which is already enforced by the schema's minItems/maxItems.

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