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

Annotations already declare readOnly, idempotent, closed-world, non-destructive, so the safety profile is covered. The description does add genuine value by explaining the quota computation and that over-quota watches carry `suspensa: true` and send no e-mail, which is output semantics not derivable from annotations – but it omits the shape of the returned list and any pagination or ordering behavior.

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?

Three tight sentences with the resource stated up front. The clause about the origin checking the quota 'inside the transaction' is internal implementation detail that doesn't help an agent invoke the tool, so it slightly dilutes an otherwise efficient description.

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?

With no output schema, the description must carry the return-value burden; it discloses the suspensa flag and quota accounting, which is helpful, but never describes the overall structure of the returned watch list. For a read tool with a single well-documented parameter, this is adequate but incomplete.

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?

Only one parameter (credito) with 100% schema description coverage, so the schema already documents it fully. The description adds no further meaning about the credit token, which is acceptable given the high coverage.

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 identifies the resource ('The CNPJs you watch') and mentions the quota annotation, but never uses a clear verb like 'list' or 'returns' – the action is only implied. It partially distinguishes from add_watch by describing existing watches, but an agent must infer the read/mutation distinction rather than read it.

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?

There is no statement of when to call this versus siblings such as add_watch or reactivate_watches, nor any prerequisite guidance beyond the schema's credito token. The quota explanation describes mechanics, not usage selection.

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