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

Annotations already declare readOnlyHint=true and destructiveHint=false, so safety is covered; the description adds genuinely useful behavior beyond that, namely that the no-argument form enumerates every picture by section along with its note, and that a targeted call returns at most 8 at a time. It says nothing about auth or workspace/token handling, so it is not complete enough for a 5.

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?

Purpose and the list-vs-show mechanics are front-loaded, and the closing rationale about checking whether a photo has room for text or is suited to texture inside type earns its place as decision guidance. The three sentences are dense but not padded, though they could be tightened slightly.

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 read-only viewer with no output schema and four fully documented params, the description supplies what an agent needs: what is returned (pictures by section with notes), how to filter, and the 8-per-call limit. It omits any mention of kitId/workspace resolution, a minor gap given those live in the schema.

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 the baseline is 3, but the description adds real meaning: section is a section title ("like Imagery"), names are the picture names "as the brief lists them," and the two modes have distinct list-vs-show behavior with an 8-item cap. kitId and workspace are left to the schema, which is acceptable since both are already documented there.

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 (look at) and a well-enumerated resource (logos, product marks, footage stills, layout references, examples in a brand kit), so the agent knows exactly what object it retrieves. It does not explicitly contrast itself with nearby siblings such as napkin_brand_get, napkin_brand_fonts, or napkin_brand_examples, which keeps it short of a 5.

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?

Gives clear when-to-use framing ("before you use them", "Look before you build a design around a picture") and explains the two invocation modes: no section/names lists everything by section with notes; section or names shows specific pictures. It never names an alternative tool or an exclusion case, so it stops at 4.

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