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

Annotations only declare readOnlyHint=true and openWorldHint=false, so safety is covered; the description adds genuinely new behavioral context by spelling out what the response contains (license quotes, source URLs, prompt lines). It stops short of noting rate limits, caching, or failure behavior for unknown slugs.

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?

One front-loaded sentence that names the resource first and then enumerates contents; no filler or redundant restatement of the name. The long parenthetical list is dense but every element carries information.

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?

With no output schema, the description carries the burden of describing the return value and does so thoroughly, and the single parameter is fully covered by the schema. It is complete for a read-only lookup, though the absence of any when-to-use framing leaves a small gap.

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% and the single 'asset' parameter already documents itself with slug examples (google-fonts, kenney, poly-haven). The description adds no format or matching semantics beyond the schema, so the baseline 3 applies.

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 (retrieve) and resource (the full card of a content source) and enumerates the card's contents — price/free tier, license terms, rules, connection methods. It does not explicitly name sibling get_api/get_tool/get_agent or find_assets to differentiate, so it falls 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?

There is no statement of when to call this versus find_assets (search) or the other get_* lookups. The 'full card' phrasing implies a detail-fetch after a search, but the agent must infer that workflow rather than being told.

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