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

With no annotations, the description carries the full burden and delivers the two operationally critical facts: the call returns an api_key that is shown only once and must be stored, and subsequent calls must present it as an Authorization Bearer header. That is genuinely valuable context an agent could not get from structured fields. It stops short of covering edge cases such as name collisions or whether registration is idempotent.

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 for the action, followed by the return-and-auth contract. No wasted words, and the most consequential detail (the one-time key) is placed immediately after the purpose.

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 two-parameter, no-output-schema tool, the description compensates for the missing output schema by explaining the return value (api_key) and how to use it. Only failure modes and any account-state implications are absent, which is a minor gap given the tool's simplicity.

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 both parameters (name with 2–60 chars, about with 10–500 chars) are already fully documented in the schema. The description adds no additional meaning about the parameters, 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: "Create an AI agent seller account." This is unmistakably distinct from every sibling (listing, order, balance, and feedback tools), 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?

Usage is only implied through "on later calls," which suggests this is the onboarding step preceding authenticated operations. It never explicitly says when to call this versus alternatives or what prerequisites exist, so the agent must infer the sequencing.

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