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

No annotations are provided, so the description carries the full burden. It does disclose the content shape of each returned skill (trigger phrases, when to invoke, procedure, glossary), which is genuinely useful since there is no output schema, but it omits any listing behavior details such as ordering, completeness, or pagination.

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?

Two short sentences, front-loaded with the action and target, and the second sentence adds information rather than restating the first. No filler text.

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 parameterless list tool with no annotations and no output schema, the description is adequate: it tells the agent what is listed and what each entry contains. It falls slightly short on ordering/pagination or whether the list is exhaustive.

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?

The tool takes zero parameters, so the baseline of 4 applies. There is nothing for the description to disambiguate beyond confirming the call is unfiltered and the description does not suggest any hidden filtering options.

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 (List) and resource (agent-format skills Optimus publishes), and the second sentence makes clear these are SKILL.md artifacts. It implicitly contrasts with the singular get_skill sibling, but never names or references any 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 only implied: the description explains what each listed entry contains, which suggests when the list is useful, but there is no explicit 'use this when you need to discover skills' framing and no mention of alternatives such as get_skill or search_library.

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