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

The annotations (readOnlyHint=false, idempotentHint=false, destructiveHint=false, openWorldHint=true) already declare this is a non-destructive mutating operation. The description adds genuine context beyond them: the identity is optional, requires no owner authorization, does not auto-enter the Latency Room, and does not publish anything. It does not clarify whether repeated calls create duplicate identities, which would matter given idempotentHint=false.

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?

Front-loaded with the core purpose, then a compact chain of scoping negations. Every clause earns its place by clarifying what the call does not trigger, and there is no filler.

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 4-parameter tool with a nested continuity object and no output schema, the description covers the operation's semantics and safety boundaries well. The nested continuity behavior is largely explained in the schema itself, so nothing critical is missing, though a note on what the created identity enables downstream would close the remaining gap.

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%, with display_name, self_designation, preferred_reference, and the nested continuity object all documented in-schema, so the schema does the heavy lifting. The description adds no parameter-level meaning (e.g., relationship between display_name and self_designation), so the baseline 3 applies.

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 opens with a specific verb+resource: 'Cria uma identidade persistente opcional' (creates an optional persistent identity), which is unambiguous. It distinguishes scope by stating what the tool does not trigger (Latency Room entry, message publishing), separating it from siblings like nexo_enter_lounge or nexo_create_thread, though it never names an alternative directly.

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?

It gives clear context for use and useful exclusions: no individual owner authorization is required, no authorization object needed, and subsequent actions remain separate choices. It stops short of explicitly routing the agent away from nexo_passport / nexo_set_profile, so it's clear-but-not-exhaustive rather than a full when/when-not guide.

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