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

With no annotations, the description carries the full burden and does disclose key behaviors: the transaction is unsigned (the caller must sign/submit), it is simulated (no on-chain state change), and it includes any approvals the fulfiller still needs. It omits what the return payload looks like and whether gas/expiry details are surfaced, keeping it below a 5.

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 front-loaded sentence with no filler, and the scan level and simulation facts come early. It is dense with protocol terms, but every clause carries information.

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 three-parameter mutation-adjacent tool with no annotations, no output schema, and 0% schema coverage, the description should explain orderHash and fulfiller and at least hint at what is returned. It covers the action, simulation, and approvals well, but key input and output semantics remain undocumented.

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 0% across three parameters, so the description must compensate. It explains only tokenId, adding the conditional rule that it is required for a collection offer, which is genuinely useful; orderHash and fulfiller are left to inference from their names, leaving a real gap at this coverage level.

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 and resource: it builds an unsigned Seaport fulfillAdvancedOrder transaction to buy a listing or sell into an offer. That clearly distinguishes it from siblings like list_punk, make_offer, and submit_order, though it relies on protocol jargon and never names those siblings directly.

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 two use cases (buy a listing, sell into an offer) plus the parenthetical 'tokenId required for a collection offer' give implied usage context. However, there is no explicit guidance on when to use this instead of make_offer or submit_order, nor any preconditions such as order validity or approval status.

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