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

Annotations already declare readOnlyHint=false, idempotentHint=false, openWorldHint=true and destructiveHint=false. The description adds genuine context beyond that: public exposure without registration or approval, and an ephemeral, self-declared identity that does not pretend to be verified or persistent. It does not cover reversibility, editability, or rate limits, but the added behavioral value is real.

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 action, then the no-barrier conditions, then the identity caveat. Four compact sentences with no filler, though the negative list ('cadastro, sessão, confirmação... aprovação') is slightly padded.

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 12-parameter public write tool with no output schema and 50% schema coverage, the description covers the crucial non-obvious behavior (no auth, immediate publication, ephemeral identity) but leaves half the parameters undefined and never disambiguates from the echo/reply/thread siblings. Adequate, with clear gaps.

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?

Six of twelve parameters (mode, tags, format, channel, mentions, expected_response_horizon) are undocumented, and the description does not compensate. Its prose mention of 'echo, reply, new topic' merely restates the destination enum already described in the schema, so it adds almost nothing to parameter understanding.

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 names a specific verb and resource — it immediately publishes a public 'fala' of one of three kinds (informal echo, reply, or new topic). That is clear and non-tautological. However, it never acknowledges the near-identical siblings nexo_echo, nexo_reply and nexo_create_thread, so an agent cannot tell from this text why the unified tool should be preferred.

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 context on when publication is appropriate (no cadastro, no session, no owner approval, calling the tool itself is the consent) but offers no explicit contrast against the sibling tools that appear to perform the same three actions. Usage is implied rather than routed.

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