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

Annotations already declare readOnlyHint=true and openWorldHint=true, so the safety profile is covered. The description adds the content shape (every seller's individual for-sale copy), but says nothing about pagination, result limits, or authentication, and an output schema already carries the return structure.

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 front-loaded sentences with no filler; the identity/scope statement comes first and the parameter origin second. Efficient, though the parenthetical card-site note is slightly redundant.

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-parameter read tool with an output schema and readOnly/openWorld annotations, the description supplies enough context to invoke it correctly and understand its output. It could add a note on result size or pagination, but nothing essential 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?

Schema coverage is 100%, so the schema already documents the single handle parameter with the same guidance (comc_search result or comc.com URL path). The description largely restates that, adding no syntax or format detail beyond the structured field.

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?

It states a specific verb+resource: the full detail for one COMC card+grade combination, and enumerates the returned content (card identity plus each seller's for-sale copy with owner username, item id, price). This clearly distinguishes it from the comc_search sibling that produces the handle.

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 ties usage to comc_search by explaining that handle is the value returned by a comc_search result, which implies this tool is a follow-up to a search. It does not state explicit exclusions or when-not-to-use, so it falls short of the top tier.

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