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

No annotations are provided, so the description carries the full burden of behavioral disclosure. 'Browse' implies a read-only posture and 'active' discloses a status filter, but the description does not state what each returned listing contains, how results are ordered, whether pagination beyond limit exists, or whether any side effects occur. It adds network-scope context but stops short of describing the operation's actual behavior.

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?

A single compact sentence that front-loads the verb and packs in the domain type, market nature, and network scope with zero wasted words. Every element earns its place.

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 low-complexity tool (one optional parameter, no required parameters, no enums, no nested objects), the essentials are present: purpose, listing scope ('active'), and deployment context. The only material gap is that with no output schema, the description does not hint at return-field content or ordering, which is a minor omission for a simple browse operation.

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 description coverage is 100%: the single limit parameter is fully documented in the schema as 'Max number of listings to return (default 20).' The description adds no parameter-specific meaning, but at 100% coverage the schema already carries that weight, so the baseline 3 applies.

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 uses a specific verb+resource: 'Browse active .i domains listed on the decentralized secondary marketplace,' with explicit network scope ('Arbitrum One and satellite networks'). 'Browse' cleanly differentiates it from action-oriented siblings like marketplace_list_domain, marketplace_buy_domain, and marketplace_make_offer, so an agent can distinguish this read operation without inspecting any sibling schemas.

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 usage context is implied: an agent should call this when it wants to see active secondary-market listings. However, the description names no alternatives or exclusions, such as 'to view a single listing's details use marketplace_get_domain_details' or 'to list your own domain use marketplace_list_domain.' The when-to-use is clear but the when-not-to-use is left entirely to inference.

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