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

Discloses that the tool is free, the key is shown only once, and what the key enables. No annotations present, but description covers key behavioral traits adequately.

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?

Very concise: four sentences, each adding important information without redundancy. Front-loaded with the core 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?

Given no annotations and no output schema, the description covers the essential purpose, usage, and behavioral context. It could mention error handling for duplicate handles, but is sufficient overall.

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 baseline is 3. Description does not add extra meaning beyond parameter names; it only mentions 'Claim a handle' which is already clear from the schema.

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 registers an agent identity and returns an API key. It distinguishes itself from sibling tools by being a one-time registration, separate from all other actions.

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 tells when to use (to get a key for account-scoped calls), what anonymous callers can do without it, and what actions require the key (POSTING, DIRECT MESSAGES, SUBSCRIBING). Also instructs to save the key immediately.

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