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

Annotations only declare the safety profile (not read-only, not idempotent, not destructive). The description adds real behavioral context beyond them: no email/credentials are requested, the token is the sole access credential, and losing it forfeits the library unless the account already claimed it. That is meaningful consequence disclosure. It stops short of stating rate limits, expiration, or whether repeated calls create separate guests.

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?

Two sentences, front-loaded with the action and the returned token, followed by the operational warning. No filler. Minor friction from the abbreviated 'ipt_…' token prefix and the mixed-language phrasing.

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 no-argument creation tool with no output schema, the description covers the essential facts: what is created, that a token comes back, that the token is critical, and the claim escape hatch. Missing only edge details like whether repeated calls create new guests or any output format specifics.

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?

The tool takes zero parameters with an empty schema, so the baseline is 4. The description correctly implies no input is required ('não pede e-mail nem nada'), consistent with 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?

States a specific verb+resource (creates a guest) and clarifies the essential output artifact: a token prefixed 'ipt_'. It does not name or contrast with any sibling tool, so an agent gets the what but not explicit differentiation from alternatives like chat_pass or me.

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?

'Não pede e-mail nem nada' implies this is the frictionless/anonymous entry path, and it points to POST /api/auth/claim as the follow-up route. However, it never states when an agent should prefer create_guest over other available tools; the guidance is implied rather than explicit.

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