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

Annotations declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false. The description adds context by mentioning 'leitura' (reading) and 'status de check-in', implying it retrieves check-in status rather than modifying anything. It does not contradict annotations, but the description is thin—it could mention that it returns status without changing state. Given the annotations, the bar is lower, so a 3 is appropriate.

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 short but poorly structured and confusing. It mixes Portuguese and English, lists multiple actions then abruptly says 'Flattened action: check_in', which creates ambiguity rather than clarity. It is not front-loaded with the actual purpose and reads more like internal notes than a user-facing 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 3 parameters, no output schema, and 0% schema coverage, the description is extremely incomplete. It fails to explain what the tool returns, what each parameter does, or how it relates to other e-ticket operations. The lack of any return-type or behavior description makes it insufficient for an agent to confidently invoke the tool.

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 0%, and the description only vaguely links parameters to actions: 'list (cursor); get (code); check_in (code, status de check-in)'. It does not explain the 'account' parameter, nor does it define the format or semantics of 'code' or 'cursor'. The description adds minimal value over the raw schema, which is empty of descriptions, so it fails to compensate for the low 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 states it handles e-tickets (leitura) and lists actions list/get/check_in, but then claims 'Flattened action: check_in' without clarifying whether this tool performs only check-in or all three actions. The purpose is ambiguous and does not clearly distinguish from siblings like guru_etickets_get or guru_etickets_write_do_check_in.

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?

No guidance is given on when to use this tool versus alternatives. It does not mention any context, prerequisites, or exclusions. Since siblings like guru_etickets_list, guru_etickets_get, and guru_etickets_write_do_check_in exist, the description should clarify when this check-in-specific tool is appropriate, but it doesn't.

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