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

The annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint=false, so the safety profile is fully covered without the description. What the description adds beyond that is the return-content outline, which is genuinely useful given there is no output schema, but it says nothing about unknown-slug behavior or error responses.

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 sentence that front-loads the operation and then enumerates returned fields in a compact list. No filler, no restatement of the title, and every clause conveys distinct 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?

For a one-parameter, read-only lookup, the description covers both the action and the shape of the result, which substitutes well for the absent output schema. The only meaningful omission is what happens when the slug does not resolve.

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 slug property already carries an illustrative example ("kinetic-title-drop"), so the description need only match that baseline. It adds no further meaning about slug format, case sensitivity, or where slugs come from, 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?

"Read one Lookbk skill in full" gives a specific verb (read) and a scoped resource (a single skill), and the enumeration of returned content (definition, requirements, package contents, exclusions, example prompt, install command) makes the payload concrete. It implicitly separates itself from list_video_skills and search_skills by emphasizing "one ... in full," though it never names those siblings.

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?

Usage is only implied: the phrase "one skill in full" signals a single-item lookup rather than discovery, but there is no explicit statement of when to choose this over search_skills or get_install_command, nor any note that a slug must first be obtained from a listing/search tool.

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