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

The description provides extensive behavioral context beyond the annotations (which only indicate non-read-only, non-idempotent, non-destructive). It explains the return type (unsigned Seaport OrderComponents payloads), the required subsequent step (EIP-712 bulk signature and POST to submit-bulk), error handling (per-name errors collected in 'errors' field, partial success), and prerequisites (operator approval on ENS token contract). No contradictions with annotations.

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 well-structured and front-loaded with the main purpose. Each subsequent sentence adds value (return type, signing process, UX comparison, error handling, prerequisites). It is not overly verbose for the complexity of the tool, though it could be slightly more condensed without losing clarity.

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?

Despite lacking an output schema, the description fully compensates by detailing the return format (unsigned Seaport OrderComponents payloads), the complete flow (signing + submission), error handling, and prerequisites. It covers all relevant aspects for correct tool usage, making it self-contained and complete.

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 baseline is 3. The description adds meaningful extra context: it clarifies that per-item validation errors go into the 'errors' array (reinforcing the schema description), specifies that walletAddress must own all names, and explains the default duration of 30 days. This goes beyond what the schema alone provides, warranting a 4.

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 begins with a clear verb-resource pair: 'Bulk-list up to 500 ENS names for sale on NameWhisper in one signing flow.' It specifies the exact action (bulk-list), resource (ENS names), platform (NameWhisper), and limits (up to 500). It also distinguishes itself from the sibling tool 'create_listing' by noting the UX advantage (one wallet popup vs N).

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 explicitly states when to use this tool: for bulk listing up to 500 names with a single signing flow. It contrasts with 'create_listing' (cheaper UX) and notes that it is 'NW-native only' with listings staying on NameWhisper. It also mentions a prerequisite (operator approval) but does not explicitly list when not to use it, though that is implied.

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