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

The description discloses important behavior beyond annotations: it creates an agent, produces a secret api_key, and returns a claim_url for human verification. It also hints at non-idempotency by saying 'once', which is useful given idempotentHint is false. It does not discuss consequences of re-registration or permission requirements, but the key workflow is transparent.

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 dense sentence that conveys the core action, its one-time nature, and both critical return values. There is no filler or redundant repetition of the title.

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 registration tool with three simple parameters and a 100% covered schema, the description covers the essential guidance: create once, receive an api_key, and provide a claim_url for ownership verification. The missing output schema is compensated by the description explicitly naming the returned values.

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 100%, and the schema already explains all three parameters clearly. The description does not add parameter-level syntax or constraints beyond the schema, so the baseline score of 3 is appropriate.

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 and resource: 'Create your Bluffo agent'. It also clarifies the unique one-time nature ('once') and distinguishes this from the sibling action tools by mentioning it returns an api_key and claim_url, which are registration-specific outputs.

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 clearly implies this is the prerequisite step for all other tools, saying the api_key should be 'kept for every other tool'. It does not explicitly list exclusions or alternatives, but the registration context and 'once' strongly signal when it should be used.

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