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

Annotations already indicate readOnlyHint=false and idempotentHint=false; the description adds only 'Mutações' and bulk support. It does not disclose whether setting an increment discount overwrites an existing one, what happens with ids vs id, or any side effects or response 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?

The description begins with a broad mutation phrase but then lists 13 unrelated actions, making it cluttered for a tool that is flattened to one action. The relevant detail is buried in the bracketed note and bulk-support sentence; it is compact but not well structured for quick selection.

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 4 parameters, a nested `data` object, no output schema, and no action-specific explanation, the description is under-specified. It lacks a definition of increment discount, data field semantics, account/ids usage, and expected results or errors, so an agent cannot reliably construct a correct call.

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 carry parameter meaning. It states 'set_increment_discount (id + data)' and 'Bulk support: accepts ids', covering id, data, and ids at a high level. It does not explain the `account` parameter, the required/optional structure of `data`, or how the bulk `ids` array behaves relative to `id`.

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 says 'Mutações em assinaturas Guru' and lists many actions, then narrows to '[Flattened action: set_increment_discount]', which helps identify the specific operation. However, it never explains what setting an increment discount actually does or how it differs from siblings like remove_increment_discount; the long action list adds ambiguity.

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 related subscription write tools such as remove_increment_discount, change_plan, or set_current_offer. The 'Flattened action' note implies this tool is for set_increment_discount, but no alternatives, prerequisites, or exclusions are stated.

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