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

No annotations are provided, so the description carries the full burden, and it does disclose a real behavioral trait: the returned content is a partial preview rather than the full SKILL.md, with the complete skill gated behind a human opt-in. That prevents an agent from over-promising. It still omits error behavior for unknown slugs and any sense of how truncated the preview is.

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?

Front-loaded with the purpose and contents, but the third sentence ('Brad's call 2026-10-07: the skills are not given away raw; the human opts in') is internal rationale that doesn't help an agent select or invoke the tool, and the second sentence partly repeats it. Some trimming would sharpen it.

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 single required enum parameter with no output schema and no annotations, the description is largely sufficient: it explains what comes back and that full content is gated. Missing only edge-case behavior and the origin of valid slug values.

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 0%, so the description must compensate, and it only says 'by slug' with no explanation of where slugs come from or that they must match the enumerated set. The enum of 14 values carries the real constraint, so the description adds little beyond naming the parameter.

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 (preview) and resource (one Optimus skill / SKILL.md) keyed by slug, and enumerates what the preview contains (what it does, trigger phrases, receipt door). It doesn't name a sibling like list_skills to contrast 'one' vs 'all', but the singular scope is clear.

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?

Implies usage context by explaining the preview/full-access split ('the full skill is delivered through a free Optimus University account'), which tells the agent this is a teaser step, not a retrieval of the whole skill. However it never says when to prefer this over list_skills, or how to obtain a valid slug.

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