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

Beyond annotations (which only indicate mutation, non-idempotency, non-destructiveness), the description discloses a required sponsor's bearer token, the access code's purpose as proof, and the refusal condition when challenges have not passed. This adds meaningful behavioral context without contradicting annotations.

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?

The description is two sentences long, with no wasted words. The first sentence front-loads the core purpose and combined nature, and the second covers auth and refusal conditions. Each 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?

For a tool with only two parameters and no output schema, the description covers the core purpose, prerequisites (both challenges passed, token, access code), and failure conditions. It lacks explicit return value semantics and explicit identification of the id parameter, but overall is quite complete.

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?

With 0% schema description coverage, the description adds some meaning by explaining accessCode as proof, but it leaves id to inference; it does not explicitly state that id identifies the self-registration draft or clarify its format beyond the schema's uuid type.

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 clearly states the tool's action: it binds a self-registration draft to the caller's principal and publishes it to the directory. It distinguishes this from sibling tools by emphasizing it is the owner's single approval touch, combining both steps, and requiring that both challenges have passed.

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 description gives clear context that this is the final approval step after both challenges have passed, and that the call will be refused otherwise. However, it does not explicitly name alternative tools or state definite when-not-to-use conditions, so it does not fully meet the highest bar.

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