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

The description adds minimal behavioral context beyond what annotations already convey (readOnlyHint=false, destructiveHint=false). It states 'Mutações' which implies modification, and mentions bulk support, but does not disclose side effects, idempotency, or specific behaviors of creation (e.g., whether a duplicate is rejected, if there are rate limits, or what happens on partial bulk failures). With annotations present, the description adds little value.

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 brief but poorly structured. It front-loads a generic mutation statement and lists multiple actions that are not all relevant to this tool, causing confusion. The '[Flattened action: create]' note is helpful but buried. It is not concise in the sense of being focused; it includes extraneous information that detracts from clarity.

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 mutation tool with 4 optional parameters, no output schema, and no enums, the description fails to provide essential context. It does not explain what a coupon is, what fields are required in 'data', what account refers to, or how bulk creation works. Given the complexity and the lack of schema documentation, this description is severely incomplete for an agent to use correctly.

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%, so the description must compensate for missing parameter documentation. However, it only lists parameters in the action signatures (e.g., 'create (data)') without explaining the structure of 'data', the purpose of 'account', or how 'ids' work for batching. It does not add semantic meaning beyond what the schema property names provide. This is a significant gap.

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 starts with a generic 'Mutações em cupons Guru' (mutations in Guru coupons) and lists multiple actions (create, update, delete, duplicate, set_activation). However, it includes '[Flattened action: create]', which clarifies that this specific tool performs the create action. This is not a tautology, but it is ambiguous and does not clearly state 'create a new coupon' as the primary purpose, making it somewhat confusing despite the tool name.

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 explicit guidance on when to use this tool versus its siblings (e.g., guru_coupons_write_update, guru_coupons_write_delete). The description mentions 'Bulk support' via ids but does not explain when bulk creation is appropriate or that this tool is only for creation and not other mutations. The flattened action note is implicit guidance, but it lacks explicit directives or exclusions.

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