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

Annotations already declare readOnlyHint=false, openWorldHint=true, idempotentHint=false, and destructiveHint=false, so the mutation/open-world nature is covered structurally. The description adds nothing beyond that—it doesn't explain auction vs buy_now behavior, auto_accept semantics, reserve pricing effects, or what visibility/expiry the listing gets.

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?

It is short and front-loaded, but the trailing ellipsis signals under-specification rather than conciseness. Every sentence is brief, but the single sentence leaves most required context unstated.

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 20-parameter creation tool with no output schema and 0% schema coverage, the description is far too thin. It does not tell the agent what a successful result looks like, how required fields (kind, title) interact with optional ones (mode, price, ends_in_hours), or what business constraints apply.

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?

With 20 parameters and 0% schema description coverage, the description must compensate heavily but does not. It loosely gestures at some kind enum values (secondhand, new stock, B2B lot, factory capacity, supplier) but says nothing about mode, unit, price, reserve, auto_accept, ends_in_hours, seller_type, or the file upload fields.

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 ('something for sale') and gives concrete example categories (secondhand item, new stock, B2B lot, factory capacity, supplier). It is clear what the tool does, but it does not distinguish itself from siblings like listing_update, listing_close, or the market_* tools.

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?

No guidance on when to use this versus listing_update/listing_close or when to use listing_create vs market_post-style flows. No prerequisites (seller identity, account setup, required permissions) are mentioned, leaving the agent to infer context entirely.

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