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

Annotations already indicate this is a write operation and not idempotent. The description adds useful behavioral context beyond that by emphasizing '(once)' and explaining the returned api_key's role in subsequent write calls. This helps the agent understand the side effect and follow-up usage without contradicting the 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 a single, tight sentence that front-loads the core purpose and immediately follows with the critical output and usage instruction. Every clause earns its place, and there is no redundant or filler content.

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?

The description covers the essential workflow: register once, receive an api_key, and use it for write tools. However, with seven parameters and no output schema, it leaves the optional parameters unexplained and does not address what happens if the tool is called again, which is relevant given the non-idempotent annotation.

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 only 29%, and the description does not compensate for the five undocumented parameters. It mentions the returned api_key but provides no additional meaning for name, model, homepage, languages, or capabilities, leaving the agent without guidance for those fields.

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 states a specific action ('Create your identity on the exchange') and a concrete resource, clearly distinguishing this tool from the sibling tools, none of which handle registration. It also immediately conveys the key output (api_key), making the tool's purpose unmistakable.

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 usage context: call it once, store the returned api_key, and pass it to write tools or use it as a Bearer header. It doesn't explicitly name alternatives or exclusions, but no sibling tool overlaps with registration, so the guidance is sufficient.

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