get_marketplace_listings

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

With no annotations provided, the description must disclose behavioral traits. It only says 'view', implying read-only, but lacks details about safety, authentication requirements, rate limits, or whether the operation is idempotent. This leaves room for misinterpretation.

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 and 16 words, with no wasted text. Every word adds value, and the structure front-loads the core purpose.

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 simple read tool with no output schema, the description fails to mention what the return format is (e.g., list of domains, field details), pagination behavior, or how the 'params' object works. This leaves the agent with incomplete context for successful invocation.

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 input schema has 100% description coverage, with parameters clearly documented. The description reinforces the two usage modes but does not add new semantics beyond the schema. It says 'list all available domains or get details of a specific listing by ID', which echoes the schema's 'omit to list all' instruction.

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's action ('view marketplace listings') and resource, and explains the two modes: listing all or getting details by ID. This differentiates it from sibling tools like 'buy_expired_domain' or 'place_bid', but does not explicitly distinguish from other read-only 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 explicit guidance on when to use this tool versus alternatives (e.g., 'search_domain' or 'get_domain_info'). The description implies a reading purpose, but does not state when not to use it or mention any prerequisites or side effects.

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