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

No annotations are provided, so the description carries the burden. It discloses the output structure (entries with URI, name, description, frontmatter, manifest) and hints at a read-only listing operation. However, it doesn't mention pagination, size limits, or whether the manifest is computed on demand, which would be useful for a listing tool.

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 description is two sentences, front-loads the purpose, and packs the output details into a compact list. Every sentence earns its place, and the pointer to read_skill is a useful routing hint without extra fluff.

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 listing tool with an output schema, the description is nearly complete. It explains what each entry contains and how to proceed to read a body. It could mention whether the list is sorted or whether it includes all skills, but these are minor gaps given the output schema exists.

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 has zero parameters, so there is no parameter semantics burden. The description fully explains what the tool returns, which is the only relevant semantic content. Baseline 4 is appropriate for a no-parameter tool.

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 clearly states the tool lists this product's skills and enumerates exactly what each entry contains (SKILL.md URI, name, description, verbatim frontmatter, sha256 manifest). It also distinguishes itself from the sibling read_skill by pointing to it for reading a body.

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?

The description implies this is the listing tool and directs users to read_skill for body content, giving a clear alternative. It doesn't explicitly state when not to use it, but the context is sufficient for an agent to select it for listing versus reading.

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