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

Annotations already disclose this is a non-readonly, non-idempotent, non-destructive write. The description adds a genuinely useful behavioral fact beyond them: submitting does not release payout on its own, so the agent understands this is an intermediate step. It omits retry/idempotency behavior, which matters for a non-idempotent call.

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?

Two short sentences with zero filler, front-loading the action and then the key consequence. Every sentence 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?

An output schema exists, so return values need not be explained. The description covers the actor, the action, and the payout consequence, which is enough for a correct call; it could still mention what happens to the order state afterward.

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%, so all four parameters are documented in the schema itself. The description adds no syntax, format, or constraint detail beyond the schema, 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?

States a specific verb and resource ('Seller submits the deliverable') plus the actor, which cleanly separates it from the buyer-side sibling nexus_trade_accept_delivery. It stops short of naming that sibling directly, but the role and object are unambiguous.

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 seller/submission framing implies when this tool applies, but it gives no explicit when-not condition or pointer to the follow-up tool (accept_delivery) or alternatives. Usage is inferable rather than stated.

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