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

The description adds meaningful behavioral context beyond the annotations: the API key cap ('Without an API key, results are capped at 5'), the requirement to pass an Authorization header, and the specific output fields for ranked summaries. This informs the agent about potential limitations and authentication needs. Annotations already declare read-only, non-destructive, and idempotent behavior, and the description does not contradict these.

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 two sentences long and front-loaded. The first sentence states the purpose and scope, and the second sentence efficiently conveys return fields and the critical API key constraint. There is no redundant information or filler; every word contributes to understanding.

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 the lack of an output schema, the description compensates by listing the return fields. It also covers the API key requirement and scoping. However, it does not explain pagination, ordering (beyond 'ranked'), or how the limit parameter interacts with the API key cap, leaving minor gaps. Still, it is largely complete for a search tool with simple parameters.

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 coverage is 100% with both parameters (query and limit) already described accurately in the schema. The description does not add additional parameter semantics; it merely mentions the overall result format. Given high schema coverage, the baseline of 3 applies, and the description provides no extra value for parameter understanding.

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 tool's function: 'Search 2,500+ hand-curated architecture, design, photography and art projects from Thisispaper.' It specifies the resource (Thisispaper projects) and the action (search), and lists return fields. This distinguishes it from generic siblings like 'search' and 'browse' by clearly scoping to Thisispaper's curated project database.

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 implies when to use the tool: to search Thisispaper's curated project collection. It notes that without an API key results are capped at 5, and suggests providing Authorization for full results, which is practical guidance. However, it does not explicitly state when not to use it or mention alternatives like 'search_by_taste' or 'discover', so it lacks explicit exclusions.

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