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

The description carries useful behavior beyond the annotations: the untrusted-content/prompt-injection warning, the 'never asks for private keys' assurance, and the Bearer auth requirement. However, annotations declare readOnlyHint=false and idempotentHint=false for what reads like a pure getter, and the description never explains what side effect or state change makes this non-read-only and non-idempotent — a real gap an agent should know about.

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?

Front-loaded with the action and precondition, then the security boilerplate. Every sentence is relevant, though the three-sentence trust/safety block is repeated boilerplate that occupies a large share of a short description.

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?

With one parameter, no output schema, and annotations that say little, the description covers what the agent needs: who may call it, when, what is returned conceptually (seller's private delivery details as untrusted data), and the auth requirement. Nothing essential for correct invocation is missing.

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?

Only one parameter (trade_id) and schema description coverage is 0%, so the schema supplies nothing beyond type integer/min 1. The description implies it identifies a trade whose payment has been verified, giving partial semantic grounding, but it never states what a trade_id is or where the agent obtains one.

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 ('read the seller's private delivery details') plus the actor ('Buyer') and the precondition ('after the upfront payment is verified'). This is clearly distinguishable from siblings like get_listing (public listing data) and confirm_delivery (buyer confirmation step), so an agent can select it without opening the schema.

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?

Explicitly scopes usage to the buyer role and to the post-payment state, which is the key gating condition for calling it. It does not name alternatives or exclusions (e.g., 'use confirm_delivery after receiving the goods'), so it falls short of full when/when-not guidance.

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