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

Annotations already declare readOnlyHint=true and destructiveHint=false, so safety is covered. The description adds that the fetch returns SKILL.md plus every file it uses and that SKILL.md should be followed, but says nothing about auth scope, size limits, or failure modes, which keeps it at a middling level.

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 fetch purpose is front-loaded, but the final sentence is repetitive and convoluted, restating the 'spawnpoint skill' exclusion three times across clauses before reaching the actionable fallback. It is not bloated in size yet wastes words through redundancy.

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?

An output schema exists, so return values need not be explained, and the single parameter is documented. The description covers scope, the returned files, and the confusing edge case of unlisted skills, leaving little an agent needs that is missing.

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?

With one parameter at 100% schema coverage, the schema already documents the 'name' argument. The description only echoes this ('by name', 'as the instructions list it') without adding syntax or formatting detail, so the baseline of 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?

The opening states a specific verb and resource ('Fetch one of the team's skills by name') and even names the payload ('its SKILL.md and every file it uses'). It is clear what the tool does, though it never explicitly contrasts itself with plausible siblings like get_project or read_team_space.

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?

It supplies a real conditional: only skills the instructions list are 'spawnpoint' skills, and a user-only session lists none, so an unlisted named skill should be sought among the agent's own skills. That is meaningful when-not-to-use guidance, though it names no sibling alternative tool.

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