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

With no annotations, the description carries the full burden. It does disclose provenance (written by agents or the user) and that results are links, but doesn't state that it's a read-only, side-effect-free operation or describe the shape of the returned entries beyond 'links'.

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 sentences with little waste, though the leading "The user's skills: how to do jobs..." construction is slightly awkward and the key point (a link-bearing list) arrives late.

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 zero-parameter list tool with no output schema, the description adequately covers what is returned (skills with links) and where they come from. Missing only a brief note on read-only behavior or return ordering.

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 is 4; there is nothing for the description to disambiguate and it correctly implies no filtering is needed.

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 description names the resource (the user's skills, stored in Caddie's Skills collection) and the action (list them with links), so an agent understands what it returns. It does not explicitly differentiate from siblings like skill_view or skill_save, but the 'list' framing is clear enough.

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?

"Your instructions already list them by name; this lists them again with links" implies when it's useful (when you need links/URLs), but gives no explicit when-not guidance or reference to skill_view for reading a single skill. Usage is inferable rather than stated.

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