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

Annotations already declare readOnly, idempotent and non-destructive, so safety is covered. The description adds real behavior beyond that: a package path yields a listing of skills/import paths while a SKILL.md yields a full guide, and it explains path provenance and relative naming.

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?

Four sentences, purpose front-loaded, and each sentence carries distinct information about path types, provenance, and follow-up action. Slightly dense and self-referential ('read_skills listings') but no filler.

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 correctly takes on the burden of explaining return shapes (guide, declaration, package listing). It covers navigation, provenance, and next-step behavior; only the underlying concept of a 'skill' remains abstract.

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% and the single parameter carries an example, so the baseline is 3. The description goes further by explaining what different path forms return and where valid paths originate, adding genuine meaning beyond the schema.

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 (read) and resource (skills/guides/declarations), and clarifies what is returned depending on the path type (package listing vs SKILL.md guide). It implicitly separates itself from search_skills by noting paths 'come from search results', though it never names the sibling explicitly.

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 implied rather than stated: paths 'come from search results and read_skills listings' suggests search_skills should run first. It also gives post-read guidance ('give the documented command or URL as the next step') but no explicit when-not-to-use or direct alternative routing.

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