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

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so the safety profile is covered. The description usefully discloses the return shape (content + metadata + attachment manifest). It says nothing about failure behavior when a skill or playbook ID is unknown, or about cost of pulling large attachment bodies.

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 front-loaded sentence that names the resource first and then the three returned components. No filler, no restatement of the tool name.

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 an output schema present and 100% parameter coverage, the description needn't document return values or defaults, and it correctly doesn't. What's missing is edge-case behavior (missing skill/playbook, cross-playbook ID handling), which is minor for a read-only getter.

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 every parameter carries its own doc string, including the include_content/include_attachments defaults, so the baseline is 3. The description mentions the attachment manifest with filenames and sizes, adding a little meaning to include_attachments, but nothing about skill_id accepting a name versus an ID.

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?

Specific verb and resource ('Return the full definition of one skill') plus an enumeration of the payload (SKILL.md content, metadata, attachment manifest). It does not distinguish itself from get_skill_reference or list_skills, so an agent must infer the boundary rather than being told.

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?

Fetching a single skill by ID/name implies its use case, but the description never states when to prefer it over list_skills (enumerate) or get_skill_reference (single attachment). No exclusions, prerequisites, or alternatives are given in the description text.

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